阅读说明：本技术 一种新型环保型生产碳酸锂的工艺 (Novel environment-friendly lithium carbonate production process ) 是由 何开茂 何东利 伍震洲 汪梨超 代道和 杨贤丽 江莹 谭培渊 黄剑新 于 2021-01-21 设计创作，主要内容包括：本发明涉及碳酸锂生产技术领域,特别是一种新型环保型生产碳酸锂的工艺,其包括以下步骤：将锂辉石依次经过回转窑高温煅烧,煅烧过程中产生的烟尘经尾气处理系统,将粉尘回收到双轴加湿搅拌器进行加湿处理,再次进行煅烧,冷却窑冷却,球磨机球磨,酸化窑焙烧,冷却,调浆,浸出,压滤机压榨分离,冷冻分离硫酸钠,蒸发浓缩、碳化、离心干燥、气流粉碎等工艺步骤而得。本发明在粉尘收集处增加了专用的双轴加湿搅拌器,将粉尘进行加湿处理,减少了粉尘排放的风险,有效地解决了环保问题。(The invention relates to the technical field of lithium carbonate production, in particular to a novel environment-friendly process for producing lithium carbonate, which comprises the following steps: sequentially calcining spodumene at high temperature in a rotary kiln, passing smoke generated in the calcining process through a tail gas treatment system, recycling dust into a double-shaft humidifying stirrer for humidifying, calcining again, cooling in a cooling kiln, ball-milling in a ball mill, roasting in an acidification kiln, cooling, mixing slurry, leaching, squeezing and separating by a filter press, freezing and separating sodium sulfate, evaporating and concentrating, carbonizing, centrifugally drying, crushing by air flow and the like. According to the invention, a special double-shaft humidifying stirrer is additionally arranged at the dust collecting position to humidify the dust, so that the risk of dust emission is reduced, and the problem of environmental protection is effectively solved.)

1. A novel environment-friendly process for producing lithium carbonate is characterized in that: the method comprises the following steps:

s1, calcining spodumene in a rotary kiln at the calcining temperature of 950-1200 ℃, recycling dust generated in the calcining process to a double-shaft humidifying stirrer through a tail gas treatment system for humidifying treatment, and adding the dust into the rotary kiln again for calcining; then cooling, fine grinding, acid adding reaction and cooling are carried out in sequence, after the product of the acid adding reaction is cooled to be less than or equal to 90 ℃, water is used for preparing slurry, and the solid content of the slurry is 10-70%;

s2, adding calcium carbonate slurry into the slurry obtained in the step S1, stirring and leaching, adjusting the temperature in a leaching tank to be less than or equal to 60 ℃ and the pH value to be 5.5-6, adding calcium oxide to adjust the pH value to be 8-9 after leaching for 20 minutes, then filtering by using a filter press, purifying the filtered clear liquid by using lithium hydroxide mother liquor or calcium oxide, adjusting the pH value to be 9-12, and removing impurities of iron, manganese, aluminum and calcium in the filtered clear liquid;

s3, filtering the clear filtrate obtained in the step S2 again to obtain purified liquid and purified filter residues, causticizing the purified liquid by using 50% alkaline solution or crude product mother liquor, wherein the pH value of the causticized solution is 11-14, and the temperature is normal temperature;

s4, filtering the causticized solution obtained in the step S3 to obtain causticized liquid and causticized filter residue, wherein lithium hydroxide Li in the causticized liquid₂Controlling the equivalent content of O to be 30-75 g/L, and filtering the causticized liquid through a precision filter to remove part of calcium ions;

s5, freezing and separating the filtered causticized liquid into sodium sulfate decahydrate and lithium hydroxide solution in a freezing workshop, wherein the freezing temperature is-5 to-20 ℃;

s6, purifying sodium sulfate decahydrate through evaporation concentration, heating to take out crystal water to obtain anhydrous sodium sulfate, heating to 200-800 ℃, filtering the lithium hydroxide solution through a precision filter to remove a part of calcium ions, then carrying out evaporation concentration, crystallizing, centrifuging, re-melting and filtering the concentrated crude lithium hydroxide solution through the precision filter, and then carrying out evaporation concentration through MVR to obtain a fine lithium hydroxide slurry;

s7, centrifugally separating and dissolving the fine lithium hydroxide slurry obtained in the step S6, then feeding the fine lithium hydroxide slurry into a carbonization kettle, introducing carbon dioxide gas with the pressure of 0.5MPa to perform carbonization reaction, keeping the gauge pressure in the carbonization kettle at 0.06-0.08 MPa, keeping the temperature at 48-52 ℃, stopping introducing the carbon dioxide after the reaction is finished, and opening an emptying valve of the carbonization kettle to empty excessive carbon dioxide to obtain carbonization reaction liquid;

s8, centrifugally separating the carbonization reaction liquid obtained in the step S7 to obtain solid lithium carbonate, and drying to enable the water content of the solid lithium carbonate to be less than or equal to 5%;

and S9, conveying the centrifugal solid phase to a disc type dryer through a closed conveyor for drying, wherein the moisture content of the dried material is lower than 0.2%, conveying the dried material to a lithium carbonate finished product warehouse through pneumatic conveying, conveying the material discharged from the disc type dryer to a raw material shunting system, stacking the material through a jet milling system and an automatic packaging system, and conveying the material to a finished product warehouse, wherein the finished product controls the magnetic substance to be not more than 30 PPb.

2. The novel environment-friendly lithium carbonate production process according to claim 1, characterized in that: in step S1, the requirement of the granularity of fine grinding is 200 meshes; and (3) adding sulfuric acid with the concentration of 98% during acid adding reaction, wherein the acid-material ratio is 2-4: 1, adding acid for reaction, and cooling to below 60 ℃.

3. The novel environment-friendly lithium carbonate production process according to claim 1, characterized in that: in step S2, the solid content of the calcium carbonate slurry is 10-55%; adjusting the pH value of the added calcium oxide into powder with the mass fraction of more than 75% or slurry with the solid content of 10-55%; rinsing the filter cake filtered by the filter press by using tap water or process water, blowing the filter cake by using compressed air to ensure that the water content of the filter cake is less than or equal to 20%, and returning rinsing water for slurry mixing in the step S1; during purification, if lithium hydroxide mother liquor is added, the concentration of the lithium hydroxide mother liquor is 10-50%, and if calcium oxide is added, the calcium oxide is powder with the mass fraction of more than 75% or calcium oxide slurry with the solid content of 10-55%.

4. The novel environment-friendly lithium carbonate production process according to claim 1, characterized in that: in the step S3, adding water into the purified filter residue to prepare slurry with the solid content of 10-70%, and returning to the step S1; the alkaline solution is sodium hydroxide solution, lithium hydroxide solution or the mixed solution of the sodium hydroxide solution and the lithium hydroxide solution.

5. The novel environment-friendly lithium carbonate production process according to claim 1, characterized in that: in step S4, adding water into the causticized filter residue to prepare slurry with the solid content of 10-70%, and then returning to the step S2 for purification.

6. The novel environment-friendly lithium carbonate production process according to claim 1, characterized in that: and in the step S8, a centrifugal liquid phase obtained through centrifugal separation contains a small amount of lithium carbonate, the centrifugal liquid is pumped back to a size mixing process of a lithium sulfate finished liquid production section, and the lithium sulfate finished liquid is the lithium sulfate solution obtained in the step S1 through filtering filter residues after size mixing.

7. The novel environment-friendly lithium carbonate production process according to claim 1, characterized in that: the double-shaft humidifying stirrer comprises a rack (1), a shell (2), a stirring mechanism (3), a reciprocating driving mechanism (4), a flow guide sliding block (5), a sealing element (6), a sliding mechanism (7), a rotary driver (8) and a humidifying mechanism, wherein the shell (2) is installed on the rack (1), the cross section of the shell (2) is of a waist-round structure, the center of the shell is rectangular, and the two sides of the shell are semicircular and used for containing powder; the stirring mechanisms (3) are provided with a pair and symmetrically arranged in the shell (2), and the upper end and the lower end of each stirring mechanism respectively penetrate through the top end and the bottom of the shell (2) and are used for stirring powder; the reciprocating driving mechanism (4) is installed at the top end of the shell (2), the working end of the reciprocating driving mechanism (4) is simultaneously in sliding connection with the pair of flow guide sliding blocks (5), and the driving direction of the reciprocating driving mechanism (4) is horizontally arranged and used for driving the pair of flow guide sliding blocks (5) to be symmetrically and horizontally close to or far away from the shell (2); the flow guide sliding blocks (5) are provided with a pair of pairs, the flow guide sliding blocks (5) are sleeved on a pair of working ends of the reciprocating driving mechanism (4), convex circles which are in sliding connection with the working ends of the reciprocating driving mechanism (4) are arranged on the inner walls of the flow guide sliding blocks (5), the flow guide sliding blocks are hollow inside, a liquid inlet end is communicated with an output end of the humidifying mechanism, and a liquid outlet end is rotatably connected with the top end of the stirring mechanism (3) and communicated with each other; the sealing element (6) is arranged at the position where the stirring mechanism (3) penetrates through the shell (2) and is used for ensuring the internal sealing property of the shell (2) when the stirring mechanism (3) moves horizontally; the sliding mechanism (7) is arranged at the bottom of the shell (2) in a horizontally sliding manner, and the sliding mechanism (7) is rotatably connected with one end, extending out of the bottom of the shell (2), of the stirring mechanism (3); the rotary driver (8) is arranged on the working end of the sliding mechanism (7), and the output shaft of the rotary driver (8) is connected with the bottom end of the stirring mechanism (3) and used for driving the stirring mechanism (3) to rotate.

8. The novel environment-friendly lithium carbonate production process according to claim 7, characterized in that: the shell (2) is provided with a feeding pipe (2a), a discharging pipe (2b) and a waist-shaped via hole (2 c); the feeding pipe (2a) is arranged on the outer wall of the shell (2) and used for feeding powder into the shell (2), the discharging pipe (2b) is arranged at the bottom of the shell (2) and used for guiding out the stirred material in the shell (2), the number of the waist-shaped through holes (2c) is four, the waist-shaped through holes (2c) are respectively symmetrically arranged at the top end and the bottom of the shell (2), the waist-shaped through holes (2c) are fixedly connected with the sealing element (6) and are respectively used for enabling the top end and the bottom end of the pair of stirring mechanisms (3) to extend out of the shell (2) to be connected with the flow guide sliding block (5) and the sliding mechanism (7); the shell (2) is also provided with an air inlet pipe (2d), the air inlet pipe (2d) is installed on the outer wall of the shell (2) and is communicated with the interior of the shell (2), the stirring mechanism (3) comprises a hollow rotating shaft (3a) and stirring fan blades (3b), the upper end and the lower end of the hollow rotating shaft (3a) respectively penetrate through the upper end and the bottom end of the shell (2), the upper end is rotatably connected with the liquid outlet end of the flow guide sliding block (5), the lower end is rotatably connected with the working end of the sliding mechanism (7), a plurality of water spray holes are uniformly distributed on the outer wall, and the bottom end is; the stirring fan blades (3b) are uniformly distributed on the outer wall of the hollow rotating shaft (3a) and are used for stirring powder in the shell (2), and the diameter of the circumscribed circle of the cross section of each stirring fan blade (3b) is the same as the inner diameter of the semicircular structures at the two sides of the shell (2); the reciprocating driving mechanism (4) comprises a first cylindrical cam (4a), a second cylindrical cam (4b), a two-way motor (4c) and a guide rod (4d), the axes of the first cylindrical cam (4a) and the second cylindrical cam (4b) are horizontally and symmetrically arranged at the upper end of the shell (2), two ends of the first cylindrical cam and the second cylindrical cam are rotatably connected with the shell (2) and are respectively in sliding connection with one flow guide sliding block (5), the driving directions are coaxially and reversely arranged and used for driving the pair of flow guide sliding blocks (5) to be symmetrically close to or far away from each other; the bidirectional motor (4c) is arranged at the center of the top end of the shell (2), and a pair of output shafts are respectively fixedly connected with the end parts of the first cylindrical cam (4a) and the second cylindrical cam (4b) and used for synchronously driving the first cylindrical cam (4a) and the second cylindrical cam (4b) to rotate; guide bar (4d) set up in first cylinder cam (4a) and second cylinder cam (4b) both sides in pairs, guide bar (4d) both ends and casing (2) fixed connection, guide bar (4d) and water conservancy diversion slider (5) both sides clearance fit for carry on spacingly to the direction of motion of water conservancy diversion slider (5).

9. The novel environment-friendly lithium carbonate production process according to claim 8, characterized in that: the flow guide sliding block (5) comprises a sleeving part (5a), a mounting lug (5b), a first sleeve (5c) and a second sleeve (5d), the sleeving part (5a) is sleeved on the working end of the reciprocating driving mechanism (4), the sleeving part (5a) is in sliding connection with the working end of the reciprocating driving mechanism (4), and the inner part of the flow guide sliding block is of a hollow structure; the mounting lugs (5b) are symmetrically arranged at two sides of the sleeving part (5a), and the mounting lugs (5b) are in clearance fit with the reciprocating driving mechanism (4) and used for guiding and limiting the movement direction of the sleeving part (5 a); the one end of first sleeve (5c) is installed on installation ear (5b) top to with cup joint portion (5a) inside intercommunication, the other end is connected with humidification mechanism output, be used for to leading-in pure water in cup joint portion (5a), second sleeve (5d) are installed in cup joint portion (5a) bottom, second sleeve (5d) are rotated with rabbling mechanism (3) top and are connected, and with rabbling mechanism (3) inside intercommunication, be used for leading-in rabbling mechanism (3) of the pure water that will get into in cup joint portion (5 a).

10. The novel environment-friendly lithium carbonate production process according to claim 8, characterized in that: the sealing element (6) comprises a fixing frame (6a), a connecting ring (6b) and a flexible sealing film (6c), the fixing frame (6a) is arranged on the inner wall of the waist-shaped via hole (2c) and is matched with the inner wall structure of the waist-shaped via hole (2c), the connecting ring (6b) is sleeved on the stirring mechanism (3) and is rotatably connected with the stirring mechanism (3), and the inner side of the outer side of the flexible sealing film (6c) is fixedly connected with the fixing frame (6a) and the connecting ring (6b) respectively and used for keeping the internal sealing performance of the shell (2); the sliding mechanism (7) comprises a guide rail (7a) and a sliding mounting plate (7b), the guide rail (7a) is provided with a pair of guide rails (7a), the pair of guide rails (7a) is symmetrically arranged at the bottom of the shell (2) and used for guiding and limiting the movement direction of the sliding mounting plate (7b), the sliding mounting plate (7b) is provided with a pair of sliding mounting plates (7b), the pair of sliding mounting plates (7b) is symmetrically arranged at the bottom of the shell (2), the top end of the sliding mounting plate (7b) is attached to the bottom of the shell (2) to move, two sides of the sliding mounting plate (7b) are in sliding connection with the inner sides of the guide rails (7a), the sliding mounting plate (7b) is rotatably connected with the bottom end of the stirring mechanism (3; the humidifying mechanism comprises a liquid storage tank and a hydraulic pump, the discharge end of the liquid storage tank is connected with the input end of the hydraulic pump, and the output end of the hydraulic pump is connected with the liquid inlet end of the flow guide sliding block (5).

Technical Field

The invention relates to the technical field of lithium carbonate production, in particular to a novel environment-friendly process for producing lithium carbonate.

Background

Lithium carbonate can be used for preparing ceramics, medicaments, catalysts and the like. The common lithium ion battery raw material. High-purity lithium carbonate used as a positive electrode material of a lithium ion battery as an electrolyte is receiving more and more attention. The existing method for producing lithium carbonate comprises the steps of producing lithium carbonate by taking spodumene as a raw material, extracting lithium from salt lake brine and extracting lithium carbonate from seawater. The process comprises the steps of high-temperature calcination, transformation, cooling, ball milling, acidification, roasting, cooling, size mixing, leaching, squeezing and separation, sodium sulfate freezing separation, evaporation, carbonization, centrifugal drying and the like, wherein spodumene is calcined at the high temperature of 950-1200 ℃, smoke generated in the calcination process is recycled and calcined through a tail gas treatment system, dust is easily generated at a collection position, the dust is environment-friendly, and effective components are contained in the dust, so that the utilization rate of raw materials is low.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a novel environment-friendly process for producing lithium carbonate.

The purpose of the invention is realized by the following technical scheme:

a novel environment-friendly process for producing lithium carbonate comprises the following steps:

s1, calcining spodumene in a rotary kiln at the calcining temperature of 950-1200 ℃, recycling dust generated in the calcining process to a double-shaft humidifying stirrer through a tail gas treatment system for humidifying treatment, and adding the dust into the rotary kiln again for calcining; then cooling, fine grinding, acid adding reaction and cooling are carried out in sequence, after the product of the acid adding reaction is cooled to be less than or equal to 90 ℃, water is used for preparing slurry, and the solid content of the slurry is 10-70%;

s2, adding calcium carbonate slurry into the slurry obtained in the step S1, stirring and leaching, adjusting the temperature in a leaching tank to be less than or equal to 60 ℃ and the pH value to be 5.5-6, adding calcium oxide to adjust the pH value to be 8-9 after leaching for 20 minutes, then filtering by using a filter press, purifying the filtered clear liquid by using lithium hydroxide mother liquor or calcium oxide, adjusting the pH value to be 9-12, and removing impurities of iron, manganese, aluminum and calcium in the filtered clear liquid;

s3, filtering the clear filtrate obtained in the step S2 again to obtain purified liquid and purified filter residue, wherein the purified liquid is causticized by using 50% alkaline solution or crude product mother liquor, the pH value of the causticized solution is 11-14, and the temperature is normal temperature;

s4, filtering the causticized solution obtained in the step S3 to obtain causticized liquid and causticized filter residue, wherein lithium hydroxide Li in the causticized liquid₂Controlling the equivalent content of O to be 30-75 g/L, and filtering the causticized liquid through a precision filter to remove part of calcium ions;

s5, freezing and separating the filtered causticized liquid into sodium sulfate decahydrate and lithium hydroxide solution in a freezing workshop, wherein the freezing temperature is-5 to-20 ℃;

s6, purifying sodium sulfate decahydrate through evaporation concentration, heating to take out crystal water to obtain anhydrous sodium sulfate, heating at 200-800 ℃, filtering the lithium hydroxide solution through a precision filter to remove a part of calcium ions, then carrying out evaporation concentration, crystallizing, centrifuging, re-melting, filtering through the precision filter, filtering, and then carrying out evaporation concentration through MVR to obtain a fine lithium hydroxide slurry;

s7, centrifugally separating and dissolving the fine lithium hydroxide slurry obtained in the step S6, then feeding the fine lithium hydroxide slurry into a carbonization kettle, introducing carbon dioxide gas with the pressure of 0.5MPa to perform carbonization reaction, keeping the surface pressure in the carbonization kettle at 0.06-0.08 MPa, keeping the temperature at 48-52 ℃, stopping introducing carbon dioxide after the reaction is finished, and opening an emptying valve of the carbonization kettle to empty excessive carbon dioxide to obtain carbonization reaction liquid;

s8, centrifugally separating the carbonization reaction liquid obtained in the step S7 to obtain solid lithium carbonate, and drying to enable the water content of the solid lithium carbonate to be less than or equal to 5%;

and S9, conveying the centrifugal solid phase to a disc type dryer through a closed conveyor for drying, wherein the moisture content of the dried material is lower than 0.2%, conveying the dried material to a lithium carbonate finished product warehouse through pneumatic conveying, conveying the material discharged from the disc type dryer to a raw material shunting system, stacking the material through a jet milling system and an automatic packaging system, and conveying the material to a finished product warehouse, wherein the magnetic substance of the finished product is controlled not to exceed 30 PPb.

Further, in step S1, the particle size of the fine grinding is required to be 200 mesh; and (3) adding sulfuric acid with the concentration of 98% during acid adding reaction, wherein the acid-material ratio is 2-4: 1, adding acid for reaction, and cooling to below 60 ℃.

Further, in step S2, the solid content of the calcium carbonate slurry is 10% to 55%; adjusting the pH value of the added calcium oxide into powder with the mass fraction of more than 75% or slurry with the solid content of 10-55%; rinsing the filter cake filtered by the filter press by using tap water or process water, blowing the filter cake by using compressed air to ensure that the water content of the filter cake is less than or equal to 20%, and returning rinsing water for slurry mixing in the step S1; during purification, if lithium hydroxide mother liquor is added, the concentration of the lithium hydroxide mother liquor is 10-50%, and if calcium oxide is added, the calcium oxide is powder with the mass fraction of more than 75% or calcium oxide slurry with the solid content of 10-55%.

Further, in the step S3, adding water into the purified filter residue to prepare slurry with the solid content of 10-70%, and returning to the step S1; the alkaline solution is sodium hydroxide solution, lithium hydroxide solution or the mixed solution of the sodium hydroxide solution and the lithium hydroxide solution.

Further, in step S4, the causticized filter residue is added with water to be prepared into slurry with the solid content of 10-70%, and then the process returns to the step S2 for purification.

Further, in step S8, the centrifugal liquid obtained by centrifugal separation contains a small amount of lithium carbonate, and the centrifugal liquid is pumped back to the slurry mixing process of the lithium sulfate finished liquid production section, where the lithium sulfate finished liquid is the lithium sulfate solution obtained by filtering the filter residue after slurry mixing in step S1.

Furthermore, the double-shaft humidifying stirrer comprises a rack, a shell, a stirring mechanism, a reciprocating driving mechanism, a flow guide sliding block, a sealing piece, a sliding mechanism, a rotary driver and a humidifying mechanism, wherein the shell is arranged on the rack, the cross section of the shell is of a waist-round structure, the center of the shell is rectangular, and the two sides of the shell are semicircular and used for containing powder; the stirring mechanisms are provided with a pair of stirring mechanisms which are symmetrically arranged in the shell, and the upper end and the lower end of each stirring mechanism respectively penetrate through the top end and the bottom of the shell and are used for stirring powder; the reciprocating driving mechanism is arranged at the top end of the shell, the working end of the reciprocating driving mechanism is simultaneously connected with the pair of flow guide sliding blocks in a sliding manner, and the driving direction of the reciprocating driving mechanism is horizontally arranged and used for driving the pair of flow guide sliding blocks to be symmetrically and horizontally close to or far away from the shell; the guide sliding blocks are provided with a pair of guide sliding blocks, the guide sliding blocks are sleeved on a pair of working ends of the reciprocating driving mechanism, convex circles which are in sliding connection with the working ends of the reciprocating driving mechanism are arranged on the inner walls of the guide sliding blocks, the guide sliding blocks are hollow inside, the liquid inlet ends are communicated with the output ends of the humidifying mechanism, and the liquid outlet ends are rotatably connected with the top end of the stirring mechanism and are communicated with each other; the sealing element is arranged at the position where the stirring mechanism penetrates through the shell and used for ensuring the internal sealing property of the shell when the stirring mechanism moves horizontally; the sliding mechanism can be arranged at the bottom of the shell in a horizontally smooth manner, and is rotationally connected with one end of the stirring mechanism, which extends out of the bottom of the shell; the rotary driver is arranged on the working end of the sliding mechanism, and the output shaft of the rotary driver is connected with the bottom end of the stirring mechanism and used for driving the stirring mechanism to rotate.

Further, the shell is provided with a feeding pipe, a discharging pipe and a waist-shaped via hole; the feeding pipe is arranged on the outer wall of the shell and used for feeding powder into the shell, the discharging pipe is arranged at the bottom of the shell and used for guiding out the stirred materials in the shell, the number of the waist-shaped through holes is four, the waist-shaped through holes are symmetrically arranged at the top end and the bottom end of the shell respectively, and the waist-shaped through holes are fixedly connected with the sealing piece and used for enabling the top end and the bottom end of the pair of stirring mechanisms to extend out of the shell to be connected with the flow guide sliding block and the; the stirring mechanism comprises a hollow rotating shaft and stirring blades, the upper end and the lower end of the hollow rotating shaft respectively penetrate through the upper end and the bottom end of the shell, the upper end is rotatably connected with the liquid outlet end of the flow guide sliding block, the lower end is rotatably connected with the working end of the sliding mechanism, a plurality of water spray holes are uniformly distributed on the outer wall, and the bottom end is communicated with the rotary driver; the stirring blades are uniformly distributed on the outer wall of the hollow rotating shaft and are used for stirring powder in the shell, and the diameter of an excircle circle of the cross section of each stirring blade is the same as the inner diameter of a semicircular structure at two sides of the shell; the reciprocating driving mechanism comprises a first cylindrical cam, a second cylindrical cam, a two-way motor and a guide rod, wherein the axes of the first cylindrical cam and the second cylindrical cam are horizontally and symmetrically arranged at the upper end of the shell, two ends of the first cylindrical cam and the second cylindrical cam are rotationally connected with the shell and are respectively connected with a flow guide sliding block in a sliding manner, and the driving directions of the first cylindrical cam and the second cylindrical cam are coaxially and reversely arranged and used for driving a pair of flow guide sliding blocks to symmetrically approach or leave each other; the bidirectional motor is arranged in the center of the top end of the shell, and the pair of output shafts are respectively fixedly connected with the end parts of the first cylindrical cam and the second cylindrical cam and used for synchronously driving the pair of first cylindrical cam and the second cylindrical cam to rotate; the guide rods are arranged on two sides of the first cylindrical cam and the second cylindrical cam in pairs, two ends of each guide rod are fixedly connected with the shell, and the guide rods are in clearance fit with two sides of the flow guide sliding block and used for limiting the movement direction of the flow guide sliding block.

Furthermore, the flow guide sliding block comprises a sleeving part, a mounting lug, a first sleeve and a second sleeve, the sleeving part is sleeved on the working end of the reciprocating driving mechanism, the sleeving part is in sliding connection with the working end of the reciprocating driving mechanism, and the inner part of the flow guide sliding block is of a hollow structure; the mounting lugs are symmetrically arranged on two sides of the sleeving part and are in clearance fit with the reciprocating driving mechanism so as to guide and limit the movement direction of the sleeving part; the one end of first sleeve is installed on installation ear top to with cup joint the inside intercommunication of portion, the other end is connected with humidification mechanism output for to leading-in pure water in the portion of cup jointing, the second sleeve is installed in the portion bottom of cup jointing, the second sleeve rotates with the rabbling mechanism top to be connected, and with the inside intercommunication of rabbling mechanism, be used for the leading-in rabbling mechanism of pure water that will get into in the portion of cup jointing.

Further, the sealing member is including fixed frame, go-between and flexible seal membrane, and fixed frame setting is on waist type via hole inner wall, and agrees with waist type via hole inner wall structure, and the go-between cover is established on rabbling mechanism, and rotates with rabbling mechanism and be connected, the outside inboard of flexible seal membrane respectively with fixed frame, go-between fixed connection for keep casing inside seal nature.

Furthermore, the sliding mechanism comprises a pair of guide rails and a pair of sliding mounting plates, the pair of guide rails are symmetrically arranged at the bottom of the shell and used for guiding and limiting the movement direction of the sliding mounting plates, the pair of sliding mounting plates are symmetrically arranged at the bottom of the shell, the top ends of the sliding mounting plates are attached to the bottom of the shell to move, two sides of the sliding mounting plates are slidably connected with the inner sides of the guide rails, the sliding mounting plates are rotatably connected with the bottom end of the stirring mechanism, and the bottoms of the sliding mounting plates are fixedly connected with the rotary driver; the humidifying mechanism comprises a liquid storage tank and a hydraulic pump, wherein the discharge end of the liquid storage tank is connected with the input end of the hydraulic pump, and the output end of the hydraulic pump is connected with the liquid inlet end of the flow guide sliding block.

The invention has the following advantages:

1. according to the invention, a special double-shaft humidifying stirrer is additionally arranged at the dust collecting position to humidify the dust, so that the risk of dust emission is reduced, and the problem of environmental protection is effectively solved.

2. Realize the synchronous drive to a pair of water conservancy diversion slider through reciprocating drive mechanism to realize the synchronous motion of a pair of rabbling mechanism on the horizontal direction, the even degree of stirring has been improved, and then work efficiency has been improved, and is concrete, the guide way isomorphism that sets up on first cylinder cam and the second cylinder cam outer wall and the cooperation of water conservancy diversion slider inner wall bulge circle, it is spacing to the water conservancy diversion slider to combine the guide bar, play drive water conservancy diversion slider along first cylinder cam and second cylinder cam axis reciprocating motion's effect. The periodic reciprocating motion of the flow guide sliding block can be realized under the condition that the rotating directions and speeds of the first cylindrical cam and the second cylindrical cam are not changed, and then the pair of stirring mechanisms are driven to move synchronously;

3. the structure of rabbling mechanism can effectively reduce the work blind area, further improves stirring effect, and is specific, and stirring fan blade cross section circumscribed circle diameter is the same with casing both sides semi-circular structure internal diameter, and when stirring fan blade moved to the stroke end to the casing both sides along with hollow rotating shaft, stirring fan blade periphery rotating surface and shells inner wall laminating. Therefore, the powder in the shell can be fully mixed, and the stirring effect is improved;

4. the air inlet pipe of the shell is connected with the pressure pump, so that the discharging speed of the shell is improved, specifically, an input end of the air inlet pipe is connected with an output end of the pressure pump by a worker, when the material in the shell needs to be led out, the discharging end of the shell is firstly opened, then the pressure pump pressurizes the inside of the shell through the air inlet pipe, the discharging speed of the shell is improved, and the production efficiency is improved;

5. the leakproofness is good, has eliminated the effusion of dust in the course of the work through the sealing member, and the environmental friendliness is high, avoids causing adverse effect to staff's health.

6. Can collect tail gas and the material that the fish scale leaked through the biax humidifier, greatly reduced the loss of raw materials.

Drawings

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a flow chart of the flue dust recycling process of the present invention;

FIG. 3 is a first perspective view of the present invention;

FIG. 4 is a perspective view of the housing of the present invention in a transparent state;

FIG. 5 is a second perspective view of the present invention;

FIG. 6 is a top view of the present invention;

FIG. 7 is a sectional view taken along line A-A of FIG. 6;

FIG. 8 is a perspective view of the housing of the present invention;

FIG. 9 is a perspective view of the reciprocating drive mechanism of the present invention;

FIG. 10 is a perspective view of the deflector slide of the present invention;

FIG. 11 is a perspective view of the seal of the present invention;

fig. 12 is a bottom view of the present invention.

The reference numbers in the figures are:

1-a frame;

2-a shell; 2 a-a feed pipe; 2 b-a discharge pipe; 2 c-a kidney via; 2 d-air inlet pipe;

3-a stirring mechanism; 3 a-a hollow rotating shaft; 3 b-stirring fan blades;

4-reciprocating drive mechanism; 4 a-a first cylindrical cam; 4 b-a second cylindrical cam; 4 c-a bi-directional motor; 4 d-a guide bar;

5-a flow guide sliding block; 5 a-a socket joint; 5 b-mounting ears; 5 c-a first sleeve; 5 d-a second sleeve;

6-a seal; 6 a-a fixed frame; 6 b-connecting ring; 6 c-a flexible sealing film;

7-a glide mechanism; 7 a-a guide rail; 7 b-a slide mounting plate;

8-rotary drive.

Detailed Description

The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.

A novel environment-friendly process for producing lithium carbonate comprises the following steps:

s1, calcining spodumene in a rotary kiln at the calcining temperature of 950-1200 ℃, recycling dust generated in the calcining process to a double-shaft humidifying stirrer through a tail gas treatment system for humidifying treatment, and adding the dust into the rotary kiln again for calcining; then cooling, fine grinding, acid adding reaction and cooling are carried out in sequence, after the product of the acid adding reaction is cooled to be less than or equal to 90 ℃, water is used for preparing slurry, and the solid content of the slurry is 10-70%;

s2, adding calcium carbonate slurry into the slurry obtained in the step S1, stirring and leaching, adjusting the temperature in a leaching tank to be less than or equal to 60 ℃ and the pH value to be 5.5-6, adding calcium oxide to adjust the pH value to be 8-9 after leaching for 20 minutes, then filtering by using a filter press, purifying the filtered clear liquid by using lithium hydroxide mother liquor or calcium oxide, adjusting the pH value to be 9-12, and removing impurities of iron, manganese, aluminum and calcium in the filtered clear liquid;

s3, filtering the clear filtrate obtained in the step S2 again to obtain purified liquid and purified filter residue, wherein the purified liquid is causticized by using 50% alkaline solution or crude product mother liquor, the pH value of the causticized solution is 11-14, and the temperature is normal temperature;

s4, filtering the causticized solution obtained in the step S3 to obtain causticized liquid and causticized filter residue, wherein lithium hydroxide Li in the causticized liquid₂Controlling the equivalent content of O to be 30-75 g/L, and filtering the causticized liquid through a precision filter to remove part of calcium ions;

s5, freezing and separating the filtered causticized liquid into sodium sulfate decahydrate and lithium hydroxide solution in a freezing workshop, wherein the freezing temperature is-5 to-20 ℃;

s6, purifying sodium sulfate decahydrate through evaporation concentration, heating to take out crystal water to obtain anhydrous sodium sulfate, heating at 200-800 ℃, filtering the lithium hydroxide solution through a precision filter to remove a part of calcium ions, then carrying out evaporation concentration, crystallizing, centrifuging, re-melting, filtering through the precision filter, filtering, and then carrying out evaporation concentration through MVR to obtain a fine lithium hydroxide slurry;

s7, centrifugally separating and dissolving the fine lithium hydroxide slurry obtained in the step S6, then feeding the fine lithium hydroxide slurry into a carbonization kettle, introducing carbon dioxide gas with the pressure of 0.5MPa to perform carbonization reaction, keeping the surface pressure in the carbonization kettle at 0.06-0.08 MPa, keeping the temperature at 48-52 ℃, stopping introducing carbon dioxide after the reaction is finished, and opening an emptying valve of the carbonization kettle to empty excessive carbon dioxide to obtain carbonization reaction liquid;

s8, centrifugally separating the carbonization reaction liquid obtained in the step S7 to obtain solid lithium carbonate, and drying to enable the water content of the solid lithium carbonate to be less than or equal to 5%;

and S9, conveying the centrifugal solid phase to a disc type dryer through a closed conveyor for drying, wherein the moisture content of the dried material is lower than 0.2%, conveying the dried material to a lithium carbonate finished product warehouse through pneumatic conveying, conveying the material discharged from the disc type dryer to a raw material shunting system, stacking the material through a jet milling system and an automatic packaging system, and conveying the material to a finished product warehouse, wherein the magnetic substance of the finished product is controlled not to exceed 30 PPb.

Further, in step S1, the particle size of the fine grinding is required to be 200 mesh; and (3) adding sulfuric acid with the concentration of 98% during acid adding reaction, wherein the acid-material ratio is 2-4: 1, adding acid for reaction, and cooling to below 60 ℃.

Further, in step S2, the solid content of the calcium carbonate slurry is 10% to 55%; adjusting the pH value of the added calcium oxide into powder with the mass fraction of more than 75% or slurry with the solid content of 10-55%; rinsing the filter cake filtered by the filter press by using tap water or process water, blowing the filter cake by using compressed air to ensure that the water content of the filter cake is less than or equal to 20%, and returning rinsing water for slurry mixing in the step S1; during purification, if lithium hydroxide mother liquor is added, the concentration of the lithium hydroxide mother liquor is 10-50%, and if calcium oxide is added, the calcium oxide is powder with the mass fraction of more than 75% or calcium oxide slurry with the solid content of 10-55%.

Further, in the step S3, adding water into the purified filter residue to prepare slurry with the solid content of 10-70%, and returning to the step S1; the alkaline solution is sodium hydroxide solution, lithium hydroxide solution or the mixed solution of the sodium hydroxide solution and the lithium hydroxide solution.

Further, in step S4, the causticized filter residue is added with water to be prepared into slurry with the solid content of 10-70%, and then the process returns to the step S2 for purification.

Further, in step S8, the centrifugal liquid obtained by centrifugal separation contains a small amount of lithium carbonate, and the centrifugal liquid is pumped back to the slurry mixing process of the lithium sulfate finished liquid production section, where the lithium sulfate finished liquid is the lithium sulfate solution obtained by filtering the filter residue after slurry mixing in step S1.

Further, as shown in fig. 3 to 12, the double-shaft humidifying agitator includes a frame 1, a housing 2, an agitating mechanism 3, a reciprocating driving mechanism 4, a flow guide slider 5, a sealing member 6, a sliding mechanism 7, a rotary driver 8 and a humidifying mechanism, the housing 2 is mounted on the frame 1, the cross section of the housing 2 is a waist circle structure, the center of the housing is rectangular, and the two sides of the housing are semi-circles for accommodating powder; the stirring mechanisms 3 are provided with a pair and symmetrically arranged in the shell 2, and the upper end and the lower end of each stirring mechanism respectively penetrate through the top end and the bottom of the shell 2 and are used for stirring powder; the reciprocating driving mechanism 4 is arranged at the top end of the shell 2, the working end of the reciprocating driving mechanism 4 is simultaneously connected with the pair of flow guide sliding blocks 5 in a sliding manner, and the driving direction of the reciprocating driving mechanism 4 is horizontally arranged and used for driving the pair of flow guide sliding blocks 5 to be symmetrically and horizontally close to or far away from the shell 2; the guide sliding blocks 5 are provided with a pair of guide sliding blocks, the guide sliding blocks 5 are sleeved on a pair of working ends of the reciprocating driving mechanism 4, convex circles which are in sliding connection with the working ends of the reciprocating driving mechanism 4 are arranged on the inner walls of the guide sliding blocks 5, the inner parts of the guide sliding blocks are hollow structures, the liquid inlet end is communicated with the output end of the humidifying mechanism, and the liquid outlet end is rotatably connected with the top end of the stirring mechanism 3 and communicated with each other; the sealing element 6 is arranged at the position where the stirring mechanism 3 penetrates through the shell 2 and used for ensuring the internal sealing property of the shell 2 when the stirring mechanism 3 moves horizontally; the sliding mechanism 7 is horizontally arranged at the bottom of the shell 2 in a sliding way, and the sliding mechanism 7 is rotationally connected with one end of the stirring mechanism 3 extending out of the bottom of the shell 2; the rotary driver 8 is arranged on the working end of the sliding mechanism 7, and the output shaft of the rotary driver 8 is connected with the bottom end of the stirring mechanism 3 and used for driving the stirring mechanism 3 to rotate.

The reciprocating drive mechanism 4, the rotary driver 8 and the humidifying mechanism are all electrically connected with the controller. A humidity sensor electrically connected with the controller for detecting the humidity of the powder is also arranged in the shell 2 for accurately controlling the water supply amount of the humidifying mechanism. The worker drops the powder into the housing 2 from the feed end of the housing 2 and then sends signals to the reciprocating drive mechanism 4, the rotary driver 8 and the humidifying mechanism through the controller. The reciprocating driving mechanism 4 receives the signal and simultaneously drives the pair of flow guide sliding blocks 5 to approach or separate from each other, so as to drive the pair of stirring mechanisms 3 which are rotatably connected with the liquid outlet ends of the flow guide sliding blocks 5 to approach or separate from each other. The rotary driver 8 receives the signal and then drives the pair of stirring mechanisms 3 to rotate, thereby realizing the stirring of the powder in the shell 2. The humidifying mechanism pressurizes the purified water after receiving the signal and then sends the pressurized purified water into the flow guide sliding block 5, and the water enters the stirring mechanism 3 through the liquid outlet end of the flow guide sliding block 5 and is finally sprayed into the shell 2 to humidify the powder. The reciprocating driving mechanism 4, the rotary driver 8 and the humidifying mechanism are matched together to fully mix the materials. After the stirring is completed, the material is discharged by opening the discharge end at the bottom of the shell 2. The flow guide sliding block 5 and the sliding mechanism 7 are matched with each other, so that the stirring mechanism 3 is limited, and the central axis of the stirring mechanism 3 is vertical all the time in the motion process.

Further, the shell 2 is provided with a feeding pipe 2a, a discharging pipe 2b and a waist-shaped via hole 2 c; the feeding pipe 2a is installed on the outer wall of the shell 2 and used for feeding powder into the shell 2, the discharging pipe 2b is arranged at the bottom of the shell 2 and used for guiding out materials which are stirred in the shell 2, four waist-shaped through holes 2c are arranged, the waist-shaped through holes 2c are symmetrically arranged at the top end and the bottom end of the shell 2 respectively, and the waist-shaped through holes 2c are fixedly connected with the sealing piece 6 and are used for enabling the top end and the bottom end of one pair of stirring mechanisms 3 to extend out of the shell 2 and be connected with the flow guide sliding block 5 and the sliding mechanism 7 respectively; the feed pipe 2a and the discharge pipe 2b are provided with control valves electrically connected with the controller. The operator opens the control valve on the feed pipe 2a and introduces the powder to be stirred into the housing 2. After the stirring has been completed, the material is removed from the outlet pipe 2b by opening the control valve at the outlet pipe 2 b. Through the waist-shaped via hole 2c, the upper end and the lower end of the stirring mechanism 3 can be respectively connected with the flow guide sliding block 5 and the sliding mechanism 7. Casing 2 still is equipped with intake pipe 2d, intake pipe 2d install on casing 2 outer wall and with the inside intercommunication of casing 2, the staff is connected intake pipe 2d input and pressure pump output, when the material to in the casing 2 is derived to needs, opens 2 discharge ends of casing earlier, then the pressure pump passes through intake pipe 2d and pressurizes in to casing 2, improves casing 2's ejection of compact speed, improves production efficiency. The stirring mechanism 3 comprises a hollow rotating shaft 3a and stirring fan blades 3b, the upper end and the lower end of the hollow rotating shaft 3a respectively penetrate through the upper end and the bottom end of the shell 2, the upper end is rotatably connected with the liquid outlet end of the flow guide sliding block 5, the lower end is rotatably connected with the working end of the sliding mechanism 7, a plurality of water spray holes are uniformly distributed on the outer wall, and the bottom end is connected with the rotary driver 8; stirring fan blade 3b evenly distributed is on hollow pivot 3a outer wall for stir the powder in the casing 2, and hollow pivot 3a is through the intercommunication of top and water conservancy diversion slider 5, and the pure water that the leading-in humidification mechanism sent into humidifies the powder through the water spray hole of seting up on the outer wall. The humidification is monitored by a humidity sensor in the housing 2 to accurately control the amount of water delivered by the humidification mechanism. The water spraying holes of the hollow rotating shaft 3a are subjected to anti-clogging treatment. The diameter of the circumscribed circle of the cross section of the stirring fan blade 3b is the same as the inner diameter of the semicircular structures at the two sides of the shell 2, when the stirring fan blade 3b moves to the tail end of the stroke along with the hollow rotating shaft 3a to the two sides of the shell 2, the peripheral rotating surface of the stirring fan blade 3b is attached to the inner wall of the shell 2, so that the powder in the shell 2 can be fully mixed, and the stirring effect is improved; the reciprocating driving mechanism 4 comprises a first cylindrical cam 4a, a second cylindrical cam 4b, a two-way motor 4c and a guide rod 4d, the axes of the first cylindrical cam 4a and the second cylindrical cam 4b are horizontally and symmetrically arranged at the upper end of the shell 2, two ends of the first cylindrical cam 4a and the second cylindrical cam 4b are rotatably connected with the shell 2 and are respectively in sliding connection with one flow guide sliding block 5, the driving directions are coaxially and reversely arranged and used for driving the pair of flow guide sliding blocks 5 to symmetrically approach or leave each other; the bidirectional motor 4c is arranged at the center of the top end of the shell 2, and a pair of output shafts are respectively fixedly connected with the end parts of the first cylindrical cam 4a and the second cylindrical cam 4b and used for synchronously driving the first cylindrical cam 4a and the second cylindrical cam 4b to rotate; guide bar 4d sets up in first cylinder cam 4a and second cylinder cam 4b both sides in pairs, guide bar 4d both ends and 2 fixed connection of casing, guide bar 4d and 5 both sides clearance fit of water conservancy diversion slider, be used for spacing to the direction of motion of water conservancy diversion slider 5, two-way motor 4c is connected with the controller electricity, the guide way isomorphism of seting up on first cylinder cam 4a and the second cylinder cam 4b outer wall cooperates with the protruding circle of 5 inner walls of water conservancy diversion slider, combine guide bar 4d to the spacing of water conservancy diversion slider 5, play the effect of drive water conservancy diversion slider 5 along first cylinder cam 4a and second cylinder cam 4b axis reciprocating motion. The periodic reciprocating motion of the flow guide sliding block 5 can be realized under the condition that the rotating directions and the speeds of the first cylindrical cam 4a and the second cylindrical cam 4b are not changed, and then the pair of stirring mechanisms 3 is driven to synchronously move.

Further, the flow guide sliding block 5 comprises a sleeving part 5a, a mounting lug 5b, a first sleeve 5c and a second sleeve 5d, the sleeving part 5a is sleeved on the working end of the reciprocating driving mechanism 4, the sleeving part 5a is connected with the working end of the reciprocating driving mechanism 4 in a sliding mode, and the inner part of the flow guide sliding block is of a hollow structure; the mounting lugs 5b are symmetrically arranged at two sides of the sleeving part 5a, and the mounting lugs 5b are in clearance fit with the reciprocating driving mechanism 4 and used for guiding and limiting the movement direction of the sleeving part 5 a; the one end of first sleeve 5c is installed on installation ear 5b top to with the inside intercommunication of portion 5a that cup joints, the other end is connected with humidification mechanism output for leading-in pure water in to the portion 5a that cup joints, second sleeve 5d is installed in the portion 5a bottom that cup joints, and second sleeve 5d rotates with 3 tops of rabbling mechanism to be connected, and with 3 inside intercommunications of rabbling mechanism, be used for the leading-in rabbling mechanism 3 of pure water that will get into in the portion 5a that cup joints.

The convex circle of the flow guide sliding block 5 is arranged on the inner wall of the outer wall laminating of the outer wall of the first cylindrical cam 4a and the outer wall laminating of the outer wall of the second cylindrical cam 4b of the reciprocating driving mechanism 4 and matched with the guide grooves on the outer wall of the first cylindrical cam 4a and the outer wall of the second cylindrical cam 4b to realize reciprocating motion. The guide rod 4d performs a limiting and guiding function on the mounting lug 5b so as to limit and guide the movement direction of the socket 5 a. The joints of the first sleeve 5c and the second sleeve 5d with the top ends of the humidifying mechanism and the stirring mechanism 3 are provided with sealing bearings, which are not shown in the figure.

Further, the sealing member 6 comprises a fixing frame 6a, a connecting ring 6b and a flexible sealing film 6c, the fixing frame 6a is arranged on the inner wall of the waist-shaped via hole 2c and is matched with the inner wall structure of the waist-shaped via hole 2c, the connecting ring 6b is sleeved on the stirring mechanism 3 and is rotatably connected with the stirring mechanism 3, and the inner side of the outer side of the flexible sealing film 6c is fixedly connected with the fixing frame 6a and the connecting ring 6b respectively for keeping the internal sealing performance of the shell 2.

The flexible sealing film 6c has better extensibility. When the connecting ring 6b moves horizontally along with the stirring mechanism 3, the flexible sealing film 6c is subjected to recoverable tensile deformation, and the sealing performance of the interior of the shell 2 is always ensured.

Furthermore, the sliding mechanism 7 comprises a guide rail 7a and a sliding mounting plate 7b, the guide rail 7a has a pair of guide rails 7a, the pair of guide rails 7a is symmetrically arranged at the bottom of the housing 2 for guiding and limiting the moving direction of the sliding mounting plate 7b, the sliding mounting plate 7b has a pair of sliding mounting plates 7b, the pair of sliding mounting plates 7b is symmetrically arranged at the bottom of the housing 2, the top end of the sliding mounting plate 7b is attached to the bottom of the housing 2 to move, two sides of the sliding mounting plate 7b are slidably connected with the inner sides of the guide rails 7a, the sliding mounting plate 7b is rotatably connected with the bottom end of the stirring mechanism 3, the bottom end is fixedly connected with the rotary driver 8, the moving direction of the sliding mounting plate 7b is limited by the guide rails 7a, when the stirring mechanism 3 moves horizontally along with the guide slider 5, the bottom, the connection between the sliding mounting plate 7b and the stirring mechanism 3 is provided with a sealing bearing, which is not shown in the figure. The slide mounting plate 7b also supports the rotary drive 8; the humidifying mechanism comprises a liquid storage tank and a hydraulic pump, the discharge end of the liquid storage tank is connected with the input end of the hydraulic pump, the output end of the hydraulic pump is connected with the liquid inlet end of the flow guide sliding block 5, and the hydraulic pump is electrically connected with the controller. The controller pressurizes the purified water stored in the liquid storage tank through the hydraulic pump, then sends the pressurized purified water into the flow guide sliding block 5, and finally sprays the pressurized purified water into the shell 2 through the stirring mechanism 3 to humidify the powder. The fluid reservoir and the hydraulic pump are not shown in the figures.

The working steps of the double-shaft humidifying stirrer are as follows:

firstly, putting the dust into the shell 2 from the feeding end of the shell 2, and then sending signals to the reciprocating driving mechanism 4, the rotary driver 8 and the humidifying mechanism through the controller.

And step two, the reciprocating driving mechanism 4 simultaneously drives the pair of flow guide sliding blocks 5 to approach or separate from each other after receiving the signal, and further drives the pair of stirring mechanisms 3 which are rotatably connected with the liquid outlet ends of the flow guide sliding blocks 5 to approach or separate from each other.

And step three, the rotary driver 8 drives the pair of stirring mechanisms 3 to rotate after receiving the signals, so that the powder in the shell 2 is stirred.

And step four, pressurizing the purified water by the humidifying mechanism after receiving the signal, sending the pressurized purified water into the flow guide sliding block 5, enabling the water to enter the stirring mechanism 3 through the liquid outlet end of the flow guide sliding block 5, and finally spraying the water into the shell 2 to humidify the powder.

And step five, the reciprocating driving mechanism 4, the rotary driver 8 and the humidifying mechanism are matched together to fully mix the materials, and after stirring is completed, the materials are discharged by opening the discharge end at the bottom of the shell 2 and then are transferred into the rotary kiln for calcination again.

The double-shaft humidifying stirrer is additionally arranged at the tail gas treatment working section of the rotary kiln, the tail gas of the rotary kiln is subjected to treatment by the multi-tube ceramic dust remover and the bag-type dust remover and then is discharged in an organized manner through a chimney of 50 meters, and the dust collected by the multi-tube ceramic dust remover and the bag-type dust remover is conveyed to the double-shaft humidifying stirrer through the pipeline conveyor, the spiral conveyor and the scraper conveyor to perform humidifying treatment on the dust, so that the dust pollution is reduced, the raw material components in the dust are collected and utilized again on the other hand, and the resource waste is reduced.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.