阅读说明：本技术 一种利用镁橄榄石尾矿制取硫酸镁及白炭黑的工艺及制取设备 (Process and equipment for preparing magnesium sulfate and white carbon black by using forsterite tailings ) 是由 周鑫 赵树伟 于 2020-12-10 设计创作，主要内容包括：本发明公开了一种利用镁橄榄石尾矿制取硫酸镁及白炭黑的工艺,包括以下步骤：S1、通过PLC控制器(9)控制进水阀门(207)注入一定量的纯水到硫酸稀释罐(2)中,启动硫酸稀释罐(2)上的搅拌电机(209),然后缓慢注入浓硫酸到硫酸稀释罐(2)中进行；在稀释过程中会产生大量的热,并进行升温；在稀释完成后,通过操作气缸(204)使得弧形保温板(205)夹在硫酸稀释罐(2)两侧,对稀释后的硫酸溶液进行保温。本发明,通过浓硫酸稀释后直接投入到反应过程中,且在硫酸稀释罐上设置有弧形保温板,可以保留浓硫酸稀释时产生的热量,在进行投入使用时,降低了大量需要加热的能源,更为节能。(The invention discloses a process for preparing magnesium sulfate and white carbon black by utilizing forsterite tailings, which comprises the following steps: s1, controlling a water inlet valve (207) to inject a certain amount of pure water into the sulfuric acid dilution tank (2) through a PLC (9), starting a stirring motor (209) on the sulfuric acid dilution tank (2), and then slowly injecting concentrated sulfuric acid into the sulfuric acid dilution tank (2); a large amount of heat is generated in the dilution process, and the temperature is increased; after dilution is finished, the arc-shaped heat insulation plates (205) are clamped on two sides of the sulfuric acid dilution tank (2) by operating the air cylinders (204), and heat insulation is carried out on the diluted sulfuric acid solution. According to the invention, concentrated sulfuric acid is diluted and then directly put into the reaction process, and the arc-shaped heat-insulating plate is arranged on the sulfuric acid dilution tank, so that heat generated during dilution of the concentrated sulfuric acid can be reserved, a large amount of energy sources needing to be heated are reduced when the concentrated sulfuric acid is put into use, and more energy is saved.)

1. A process for preparing magnesium sulfate and white carbon black by utilizing forsterite tailings is characterized by comprising the following steps:

s1, controlling a water inlet valve (207) to inject a certain amount of pure water into the sulfuric acid dilution tank (2) through a PLC (9), starting a stirring motor (209) on the sulfuric acid dilution tank (2), and then slowly injecting concentrated sulfuric acid into the sulfuric acid dilution tank (2); a large amount of heat is generated in the dilution process, and the temperature is increased; after dilution is finished, clamping the arc-shaped heat-insulation plates (205) at two sides of the sulfuric acid dilution tank (2) by operating the air cylinder (204), and insulating the diluted sulfuric acid solution;

s2, opening a first valve (301) to transfer all the sulfuric acid solution in the sulfuric acid dilution tank (2) to the pickling reaction tank (4), closing the first valve (301), slowly adding the ground forsterite tailing powder into the pickling reaction tank (4), opening a stirring motor (209) to stir positively, opening a power supply of an electric heating wire (402) in the pickling process, and preserving heat through heating to enable the forsterite tailing powder to react for 1-2 hours at the temperature of 80-100 ℃; in this process, the step of S1 is repeated;

s3, opening a second valve (501), introducing the filtrate in the pickling reaction tank (4) into a filtrate reaction tank (6) under the action of a stirring and filtering mechanism, then closing the second valve (501), opening a third valve (701), adjusting a stirring motor (209) on the pickling reaction tank (4) to rotate reversely, feeding the spiral auger blade (404) downwards, discharging the filter residue from a filter residue discharge pipe (7) into a filter residue reaction tank (8), and then closing the third valve (701);

s4, adding 1: 1 forsterite slurry into the filtrate reaction tank (6) for completing the S3, adjusting the pH of the mixed solution to 5-6, and filtering by a filtering mechanism to obtain secondary filtrate; the secondary filtrate is put in a reaction tank on the fourth step from top to bottom of the step frame (1), then the secondary filtrate is heated to 50-60 ℃, and then 50-60% of lime slurry is slowly added until the PH value is 7.5-8; then boiling, concentrating, crystallizing and dehydrating to obtain magnesium sulfate; in the process, the steps S1-S3 are repeated;

s5, adding 30-50% of sodium hydroxide solution into a filter residue reaction tank (8) for completing S3, mixing the sodium hydroxide solution and the residue according to the ratio of 4: 1, heating to 80-100 ℃, keeping the temperature for reaction for 2-4 hours, adjusting the pH to 6.5 by adding 50-60% of sulfuric acid, filtering at 50-60 ℃ to obtain filter residue, and drying the filter residue to obtain the white carbon black.

2. The process for preparing magnesium sulfate and white carbon black by using the forsterite tailings as claimed in claim 1, wherein the powder diameter of the ground forsterite tailings powder is 300-400 meshes.

3. The utility model provides a utilize forsterite tailing to prepare equipment of preparing magnesium sulfate and white carbon black which characterized in that includes: a step frame (1), a sulfuric acid diluting tank (2) is fixedly connected to a first step on the top of the step frame (1) through a supporting leg (201), two sides of the upper part of the sulfuric acid dilution tank (2) are respectively and fixedly communicated with a pure water inlet pipe (206) and a concentrated sulfuric acid inlet pipe (212), a water inlet valve (207) is arranged on the pure water inlet pipe (206), an anti-corrosion valve (211) is arranged on the concentrated sulfuric acid inlet pipe (212), a first step at the top of the step frame (1) is fixedly connected with a support frame (203), an air cylinder (204) is horizontally and fixedly arranged on one side of the supporting frame (203), one end of a piston rod of the air cylinder (204) is fixedly connected with two groups of arc-shaped heat preservation plates (205), the two groups of arc-shaped heat preservation plates (205) are arranged, two groups of arc-shaped heat-insulation plates (205) are respectively arranged on two sides of the sulfuric acid dilution tank (2);

the step frame (1) is provided with an acid washing reaction tank (4) in a sinking manner from a second step above and below, the step frame (1) is provided with a filtrate reaction tank (6) and a filter residue reaction tank (8) in a sinking manner from a third step above and below, the bottom of the sulfuric acid dilution tank (2) is communicated with the upper part of the acid washing reaction tank (4) through a connecting pipe (3), and the connecting pipe (3) is also provided with a first valve (301);

the bottom of the pickling reaction tank (4) is provided with a heat insulation sleeve (202), an asbestos layer (401) is sleeved on the outer side of the lower portion of the pickling reaction tank (4), an electric heating wire (402) is wound on the outer side of the asbestos layer (401), and the bottom of the pickling reaction tank (4) is further communicated with a filtering mechanism;

the filter mechanism comprises a flange sleeve (403), the upper end of the flange sleeve (403) is sleeved on an outlet at the bottom of the acid washing reaction tank (4), one side of the upper part of the flange sleeve (403) is communicated with a filter residue discharge port (411), the filter residue discharge port (411) is communicated with the upper part of the filter residue reaction tank (8) through a filter residue discharge pipe (7), a third valve (701) is installed on the filter residue discharge pipe (7), a filtrate discharge port (407) is communicated with one side of the lower part of the flange sleeve (403), the filtrate discharge port (407) is communicated with the upper part of the filtrate reaction tank (6) through a filtrate discharge pipe (5), and a second valve (501) is installed on the filtrate discharge pipe (5);

a filter net rack (410) is slidably mounted inside the flange sleeve (403), a filter net (406) is mounted at the upper part of the filter net rack (410), a corrosion-resistant spring (408) is fixedly connected to the central bottom of the filter net rack (410), and the lower end of the corrosion-resistant spring (408) is fixedly connected to the inner bottom of the flange sleeve (403);

a first stirring shaft (412) is rotatably arranged in the pickling reaction tank (4), a stirring rod (413) is fixedly connected to the first stirring shaft (412), a spiral auger blade (404) is fixedly connected to the lower end of the first stirring shaft (412), the spiral auger blade (404) is arranged on the inner upper portion of the flange sleeve (403), a protruding strip (405) is further connected to the lower end of the first stirring shaft (412), and the lower end of the protruding strip (405) is in surface contact with the upper portion of the filter screen (406);

the bottom of the filtrate reaction tank (6) and the bottom of the filter residue reaction tank (8) are also provided with filtering mechanisms, and the filtering mechanisms are respectively communicated with the reaction tanks for storing liquid and filter residues;

stirring motors (209) are arranged at the tops of the sulfuric acid dilution tank (2), the acid washing reaction tank (4), the filtrate reaction tank (6) and the filter residue reaction tank (8), and the stirring motors (209) arranged at the tops of the acid washing reaction tank (4), the filtrate reaction tank (6) and the filter residue reaction tank (8) are all set as forward and reverse rotation speed reduction motors;

still including PLC controller (9), PLC controller (9) fixed mounting be in one side of step frame (1), the control output of PLC controller (9) respectively with the automatically controlled end electric connection of agitator motor (209), just be provided with the control button that is used for controlling agitator motor (209) just to rotate on PLC controller (9).

4. The equipment for preparing magnesium sulfate and white carbon black by using forsterite tailings as claimed in claim 3, wherein the first valve (301), the second valve (501), the third valve (701) and the fourth valve (801) are all set as electric valves, and electric control ends of the first valve (301), the second valve (501), the third valve (701) and the fourth valve (801) are respectively connected with a control output end of the PLC (9).

5. The equipment for preparing magnesium sulfate and white carbon black by using forsterite tailings as claimed in claim 4, wherein the anti-corrosion valve (211) and the water inlet valve (207) are both set to be electric flow valves, and the electric control end of the anti-corrosion valve (211) and the electric control end of the water inlet valve (207) are respectively connected with the control output end of the PLC (9).

6. The equipment for preparing magnesium sulfate and white carbon black by using forsterite tailings as claimed in claim 4, wherein an anti-corrosion temperature sensor is mounted on a side wall of the pickling reaction tank (4), a signal output end of the anti-corrosion temperature sensor is electrically connected with a signal input end of the PLC (9), and a control output end of the PLC (9) is electrically connected with an electric control end of the electric heating wire (402).

7. The equipment for preparing magnesium sulfate and white carbon black by using forsterite tailings as claimed in claim 4, wherein the sulfuric acid dilution tank (2) is a transparent glass reaction kettle, scale marks (213) are arranged on the outer side surface of the sulfuric acid dilution tank (2), the top of the sulfuric acid dilution tank (2) is provided with an exhaust pipe (208), and the top of the sulfuric acid dilution tank (2) is provided with a sampling port (210).

8. The equipment for preparing magnesium sulfate and white carbon black by using forsterite tailings as claimed in claim 4, wherein a second stirring shaft (214) is rotatably mounted inside the sulfuric acid dilution tank (2), a drainage strip (215) is fixedly connected to the inner wall of the sulfuric acid dilution tank (2), the upper end of the drainage strip (215) is arranged on the lower side of the concentrated sulfuric acid inlet pipe (212), and a plurality of branch flow branches (216) are arranged on the lower portion of the drainage strip (215).

9. The equipment for preparing the magnesium sulfate and the white carbon black by utilizing the forsterite tailings as claimed in claim 4, wherein the inner wall of the flange sleeve (403) is fixedly connected with limit salient points (409) respectively at the upper side and the lower side of the filter screen frame (410).

Technical Field

The invention relates to the technical field of magnesium sulfate and white carbon black preparation, in particular to a process for preparing magnesium sulfate and white carbon black by utilizing forsterite tailings, and especially relates to equipment for preparing magnesium sulfate and white carbon black by utilizing forsterite tailings.

Background

Forsterite is a silicate mineral, which is present in ultrabasic igneous rocks. It and fayalite form a complete isomorphism series, and are magnesium-rich members of the series. In China, the source distribution of forsterite ore is wide, magnesium sulfate and white carbon black can be prepared by using forsterite, but the existing process for preparing magnesium sulfate and white carbon black by using forsterite is complex, a complete set of preparation equipment matched with the magnesium sulfate and white carbon black is not provided, the preparation efficiency is low, in the preparation process, concentrated sulfuric acid cannot be directly and quickly applied to reaction after being diluted, a large amount of heat is wasted, and in the reaction, the concentrated sulfuric acid needs to be reheated, so that a large amount of energy is wasted.

Therefore, a process and equipment for preparing magnesium sulfate and white carbon black by using forsterite tailings are provided.

Disclosure of Invention

The technical task of the invention is to provide a process and equipment for preparing magnesium sulfate and white carbon black by utilizing forsterite tailings, wherein a set of complete preparation equipment is formed by arranging a set of multistage reaction filtering equipment on a step frame, and a plurality of process steps can be simultaneously carried out in the production process, so that the production efficiency is improved; the heat generated by diluting concentrated sulfuric acid can be reserved, a large amount of energy required to be heated is reduced when the concentrated sulfuric acid is put into use, and more energy is saved, so that the problems are solved.

The technical scheme of the invention is realized as follows:

the invention provides a process for preparing magnesium sulfate and white carbon black by utilizing forsterite tailings, which comprises the following steps:

s1, controlling a water inlet valve to inject a certain amount of pure water into a sulfuric acid dilution tank through a PLC controller, starting a stirring motor on the sulfuric acid dilution tank, and then slowly injecting concentrated sulfuric acid into the sulfuric acid dilution tank; a large amount of heat is generated in the dilution process, and the temperature is increased; after dilution is completed, clamping the arc-shaped heat-insulation plates on two sides of a sulfuric acid dilution tank by operating an air cylinder, and carrying out heat insulation on the diluted sulfuric acid solution;

s2, opening a first valve to transfer all the sulfuric acid solution in the sulfuric acid dilution tank to the pickling reaction tank, closing the first valve, slowly adding the ground forsterite tailing powder into the pickling reaction tank, opening a stirring motor to stir positively, opening a power supply of an electric heating wire in the pickling process, and keeping the temperature by heating to enable the forsterite tailing powder to react for 1-2 hours at the temperature of 80-100 ℃; in this process, the step of S1 is repeated;

s3, opening a second valve, introducing the filtrate in the pickling reaction tank into a filtrate reaction tank under the action of a stirring and filtering mechanism, then closing the second valve, opening a third valve, adjusting a stirring motor on the pickling reaction tank to rotate reversely, feeding the spiral auger blade downwards, discharging the filter residue from a filter residue discharge pipe into a filter residue reaction tank, and then closing the third valve;

s4, adding 1: 1 forsterite slurry into the filtrate reaction tank for completing the S3, adjusting the pH of the mixed solution to 5-6, and filtering by a filtering mechanism to obtain secondary filtrate; the secondary filtrate is put in a reaction tank on the fourth step from the top to the bottom of the step frame, then the secondary filtrate is heated to 50-60 ℃, and then 50-60% of lime slurry is slowly added until the PH value is 7.5-8; then boiling, concentrating, crystallizing and dehydrating to obtain magnesium sulfate; in the process, the steps S1-S3 are repeated;

s5, adding 30-50% of sodium hydroxide solution into a filter residue reaction tank for completing S3, mixing the sodium hydroxide solution and the residue according to the ratio of alkali to residue of 4: 1, heating to 80-100 ℃, keeping the temperature for reaction for 2-4 hours, adjusting the pH to 6.5 by adding 50-60% of sulfuric acid, filtering at 50-60 ℃ to obtain filter residue, and drying the filter residue to obtain the white carbon black.

Preferably, the powder diameter of the ground forsterite tailing powder is set to 300-400 mesh.

The invention also provides a preparation device for preparing magnesium sulfate and white carbon black by utilizing the forsterite tailings, which comprises a step frame, wherein a sulfuric acid dilution tank is fixedly connected to a first step at the top of the step frame through a supporting leg, a pure water inlet pipe and a concentrated sulfuric acid inlet pipe are respectively and fixedly communicated with two sides of the upper part of the sulfuric acid dilution tank, a water inlet valve is installed on the pure water inlet pipe, an anti-corrosion valve is installed on the concentrated sulfuric acid inlet pipe, a supporting frame is fixedly connected to the first step at the top of the step frame, an air cylinder is horizontally and fixedly installed on one side of the supporting frame, an arc-shaped heat insulation plate is fixedly connected to one end of a piston rod of the air cylinder, two groups of arc-shaped heat insulation plates are arranged, and;

the pickling reaction tank is installed on the step frame in a sinking mode from the second step above and below, the filtrate reaction tank and the filter residue reaction tank are installed on the step frame in a sinking mode from the third step above and below, the bottom of the sulfuric acid dilution tank is communicated with the upper portion of the pickling reaction tank through a connecting pipe, a first valve is further installed on the connecting pipe, a heat insulation sleeve is installed at the bottom of the pickling reaction tank, an asbestos layer is sleeved on the outer side of the lower portion of the pickling reaction tank, an electric heating wire is wound on the outer side of the asbestos layer, and a filtering mechanism is further communicated with the bottom of the pickling reaction tank;

the filter mechanism comprises a flange sleeve, the upper end of the flange sleeve is sleeved on an outlet at the bottom of the pickling reaction tank, one side of the upper part of the flange sleeve is communicated with a filter residue discharge port, the filter residue discharge port is communicated with the upper part of the filter residue reaction tank through a filter residue discharge pipe, a third valve is arranged on the filter residue discharge pipe, one side of the lower part of the flange sleeve is communicated with a filtrate discharge port, the filtrate discharge port is communicated with the upper part of the filtrate reaction tank through a filtrate discharge pipe, and a second valve is arranged on the filtrate discharge pipe;

a filter net rack is slidably mounted inside the flange sleeve, a filter net is mounted at the upper part of the filter net rack, a corrosion-resistant spring is fixedly connected to the central bottom of the filter net rack, and the lower end of the corrosion-resistant spring is fixedly connected to the inner bottom of the flange sleeve;

a first stirring shaft is rotatably arranged in the pickling reaction tank, a stirring rod is fixedly connected to the first stirring shaft, a spiral auger blade is fixedly connected to the lower end of the first stirring shaft, the spiral auger blade is arranged at the inner upper part of the flange sleeve, a protruding strip is further connected to the lower end of the first stirring shaft, and the lower end of the protruding strip is in surface contact with the upper part of the filter screen;

the bottom parts of the filtrate reaction tank and the filter residue reaction tank are also provided with a filtering mechanism, and the filtering mechanisms are respectively communicated with the reaction tanks for storing liquid and filter residue; stirring motor is all installed at the top of sulphuric acid dilution tank, pickling retort, filtrating retort and filter residue retort, and is located the stirring motor at pickling retort, filtrating retort and filter residue retort top all sets up to just reversing gear motor.

Preferably, the stirring device further comprises a PLC, the PLC is fixedly installed on one side of the step frame, the control output end of the PLC is electrically connected with the electric control end of the stirring motor respectively, and a control button used for controlling the forward and reverse rotation of the stirring motor is arranged on the PLC.

Preferably, the first valve, the second valve, the third valve and the fourth valve are all set as electric valves, and electric control ends of the first valve, the second valve, the third valve and the fourth valve are respectively connected with a control output end of the PLC.

Preferably, the anti-corrosion valve and the water inlet valve are both set to be electric flow valves, and the electric control end of the anti-corrosion valve and the electric control end of the water inlet valve are respectively connected with the control output end of the PLC controller.

Preferably, an anti-corrosion temperature sensor is installed on the side wall of the pickling reaction tank, the signal output end of the anti-corrosion temperature sensor is electrically connected with the signal input end of the PLC, and the control output end of the PLC is electrically connected with the electric control end of the electric heating wire.

Preferably, the sulfuric acid dilution tank is arranged to be a transparent glass reaction kettle, scale marks are arranged on the surface of the outer side of the sulfuric acid dilution tank, the top of the sulfuric acid dilution tank is provided with an exhaust pipe, and the top of the sulfuric acid dilution tank is provided with a sampling port.

Preferably, the inside of sulphuric acid dilution tank rotates and installs the second (mixing) shaft, fixedly connected with drainage strip on the inner wall of sulphuric acid dilution tank, the upper end setting of drainage strip is in the downside of concentrated sulfuric acid admission pipe, the lower part of drainage strip is provided with a plurality of reposition of redundant personnel branch.

Preferably, the inner wall of the flange sleeve is fixedly connected with limit salient points respectively at the upper side and the lower side of the filter screen frame.

Compared with the prior art, the invention has the advantages and positive effects that:

1. according to the invention, a set of multistage reaction filtering equipment is arranged on the step frame to form a set of complete preparation equipment, so that in the preparation process, the intermediate transfer process is saved, and the intermediate connecting pipelines and transfer equipment are reduced; in the production process, a plurality of process steps can be carried out simultaneously, so that the production efficiency is improved;

2. according to the invention, concentrated sulfuric acid is diluted and then directly put into the reaction process, and the arc-shaped heat-insulating plate is arranged on the sulfuric acid dilution tank, so that heat generated during dilution of the concentrated sulfuric acid can be reserved, a large amount of energy sources needing to be heated are reduced when the concentrated sulfuric acid is put into use, and more energy is saved;

3. according to the invention, the direct filtration can be carried out at the bottom of the reaction tank through the filtering mechanism, and the direct filtration is not exposed in the filtering process, so that the leakage and risk of sulfuric acid are reduced; meanwhile, filter residues and filtrate are respectively distributed to different reaction tanks positioned at the next stage on the step frame for reaction, and the upper stage, the lower stage and the liquid-residue are separated, so that the management and the maintenance are convenient, and the production safety is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a flow chart of a process for preparing magnesium sulfate and white carbon black by using forsterite tailings according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a preparation device for preparing magnesium sulfate and white carbon black by using forsterite tailings according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a sulfuric acid dilution tank in a preparation apparatus for preparing magnesium sulfate and white carbon black by using forsterite tailings according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a flange sleeve in a magnesium sulfate and white carbon black preparation device utilizing forsterite tailings according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of the internal bottom structure of an acid washing reaction tank in a preparation device for preparing magnesium sulfate and white carbon black by using forsterite tailings according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of an internal structure of a sulfuric acid dilution tank in a preparation apparatus for preparing magnesium sulfate and white carbon black by using forsterite tailings according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a drainage strip in a preparation device for preparing magnesium sulfate and white carbon black by using forsterite tailings according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a filter screen in a preparation device for preparing magnesium sulfate and white carbon black by using forsterite tailings according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a filter screen frame in a preparation device for preparing magnesium sulfate and white carbon black by using forsterite tailings according to an embodiment of the present invention.

In the figure:

1. a step frame; 2. a sulfuric acid dilution tank; 3. a connecting pipe; 301. a first valve; 4. an acid washing reaction tank; 5. a filtrate discharge pipe; 501. a second valve; 6. a filtrate reaction tank; 7. a filter residue discharge pipe; 701. a third valve; 8. a filter residue reaction tank; 801. a fourth valve; 9. a PLC controller; 201. supporting legs; 202. a thermal insulation sleeve; 203. a support frame; 204. a cylinder; 205. an arc-shaped heat insulation plate; 206. pure water enters the pipe; 207. a water inlet valve; 208. an exhaust pipe; 209. a stirring motor; 210. a sampling port; 211. an anti-corrosion valve; 212. concentrated sulfuric acid enters a pipe; 213. scale lines; 214. a second stirring shaft; 215. a drainage strip; 216. a flow splitting branch;

401. an asbestos layer; 402. an electric heating wire; 403. a flange sleeve; 404. a helical auger blade; 405. a protruding strip; 406. a filter screen; 407. a filtrate outlet; 408. a corrosion resistant spring; 409. limiting salient points; 410. a filter screen frame; 411. a residue discharge port; 412. a first stirring shaft; 413. a stirring rod.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

The invention is further described with reference to the following figures and specific examples.

As shown in figure 1, the process for preparing magnesium sulfate and white carbon black by using forsterite tailings comprises the following steps:

s1, controlling the water inlet valve 207 to inject a certain amount of pure water into the sulfuric acid dilution tank 2 through the PLC 9, starting the stirring motor 209 on the sulfuric acid dilution tank 2, and then slowly injecting concentrated sulfuric acid into the sulfuric acid dilution tank 2; a large amount of heat is generated in the dilution process, and the temperature is increased; after dilution is completed, the arc-shaped heat-insulating plates 205 are clamped on two sides of the sulfuric acid dilution tank 2 by operating the air cylinder 204, and heat insulation is performed on the diluted sulfuric acid solution;

s2, opening the first valve 301 to transfer all the sulfuric acid solution in the sulfuric acid dilution tank 2 to the pickling reaction tank 4, closing the first valve 301, slowly adding the ground forsterite tailing powder into the pickling reaction tank 4, turning on the stirring motor 209 to perform forward rotation stirring, turning on the power supply of the electric heating wire 402 during pickling, and performing heat preservation through heating to enable the forsterite tailing powder to react for 1-2 hours at the temperature of 80-100 ℃; the powder diameter of the ground forsterite tailing powder is set to be 300-400 meshes; in this process, the step of S1 is repeated;

s3, opening the second valve 501, introducing the filtrate in the pickling reaction tank 4 into the filtrate reaction tank 6 under the action of a stirring and filtering mechanism, then closing the second valve 501, opening the third valve 701, adjusting the stirring motor 209 on the pickling reaction tank 4 to rotate reversely, feeding the spiral auger blade 404 downwards, discharging the filter residue from the filter residue discharge pipe 7 into the filter residue reaction tank 8, and then closing the third valve 701;

s4, adding 1: 1 forsterite slurry into the filtrate reaction tank 6 for completing S3, adjusting the pH of the mixed solution to 5-6, and filtering by a filtering mechanism to obtain secondary filtrate; the secondary filtrate is put in a reaction tank on the fourth step from the top to the bottom of the step frame 1, then the secondary filtrate is heated to 50-60 ℃, and then 50-60% of lime slurry is slowly added until the pH value is 7.5-8; then boiling, concentrating, crystallizing and dehydrating to obtain magnesium sulfate; in the process, the steps S1-S3 are repeated;

s5, adding 30-50% of sodium hydroxide solution into a filter residue reaction tank 8 for completing S3, mixing the sodium hydroxide solution and the residue according to the ratio of alkali to residue of 4: 1, heating to 80-100 ℃, keeping the temperature for reaction for 2-4 hours, adjusting the pH to 6.5 by adding 50-60% of sulfuric acid, filtering at 50-60 ℃ to obtain filter residue, and drying the filter residue to obtain the white carbon black.

As shown in fig. 2-9, the present invention provides an implementation apparatus corresponding to the above-mentioned process for preparing magnesium sulfate and white carbon black by using forsterite tailings, and according to an embodiment of the present invention, the apparatus for preparing magnesium sulfate and white carbon black by using forsterite tailings comprises a step frame 1, a sulfuric acid dilution tank 2 is fixedly connected to a first step at the top of the step frame 1 through a support leg 201, a pure water inlet pipe 206 and a concentrated sulfuric acid inlet pipe 212 are respectively and fixedly communicated to two sides of the upper portion of the sulfuric acid dilution tank 2, a water inlet valve 207 is installed on the pure water inlet pipe 206, an anti-corrosion valve 211 is installed on the concentrated sulfuric acid inlet pipe 212, a support frame 203 is fixedly connected to the first step at the top of the step frame 1, an air cylinder 204 is horizontally and fixedly installed at one side of the support frame 203, an arc-shaped heat insulation board, and the two groups of arc-shaped heat-insulating plates 205 are respectively arranged at two sides of the sulfuric acid dilution tank 2; the step frame 1 is provided with an acid washing reaction tank 4 in a sinking way from the second step above and below, the step frame 1 is provided with a filtrate reaction tank 6 and a filter residue reaction tank 8 in a sinking way from the third step above and below, the bottom of the sulfuric acid dilution tank 2 is communicated with the upper part of the acid washing reaction tank 4 through a connecting pipe 3, and the connecting pipe 3 is also provided with a first valve 301;

the bottom of the pickling reaction tank 4 is provided with a heat insulation sleeve 202, the outer side of the lower part of the pickling reaction tank 4 is sleeved with an asbestos layer 401, the outer side of the asbestos layer 401 is wound with an electric heating wire 402, and the bottom of the pickling reaction tank 4 is also communicated with a filtering mechanism; the filtering mechanism comprises a flange sleeve 403, the upper end of the flange sleeve 403 is sleeved on an outlet at the bottom of the acid washing reaction tank 4, one side of the upper part of the flange sleeve 403 is communicated with a filter residue discharge port 411, the filter residue discharge port 411 is communicated with the upper part of a filter residue reaction tank 8 through a filter residue discharge pipe 7, a third valve 701 is installed on the filter residue discharge pipe 7, one side of the lower part of the flange sleeve 403 is communicated with a filtrate discharge port 407, the filtrate discharge port 407 is communicated with the upper part of a filtrate reaction tank 6 through a filtrate discharge pipe 5, and a second valve 501 is installed on the filtrate discharge pipe 5;

a filter screen frame 410 is slidably mounted inside the flange sleeve 403, a filter screen 406 is mounted at the upper part of the filter screen frame 410, a corrosion-resistant spring 408 is fixedly connected to the central bottom of the filter screen frame 410, and the lower end of the corrosion-resistant spring 408 is fixedly connected to the inner bottom of the flange sleeve 403;

a first stirring shaft 412 is rotatably arranged in the pickling reaction tank 4, a stirring rod 413 is fixedly connected to the first stirring shaft 412, the lower end of the first stirring shaft 412 is fixedly connected with a spiral auger blade 404, the spiral auger blade 404 is arranged at the inner upper part of the flange sleeve 403, a protruding strip 405 is also connected to the lower end of the first stirring shaft 412, and the lower end of the protruding strip 405 is in contact with the upper surface of the filter screen 406;

the bottom of the filtrate reaction tank 6 and the bottom of the filter residue reaction tank 8 are also provided with filtering mechanisms which are respectively communicated with reaction tanks for storing liquid and filter residues; stirring motor 209 is all installed at the top of sulphuric acid dilution tank 2, pickling retort 4, filtrating retort 6 and filter residue retort 8, and is located the stirring motor 209 at pickling retort 4, filtrating retort 6 and the 8 tops of filter residue retort and all sets up to just reversing gear motor.

By adopting the technical scheme, a set of multistage reaction filtering equipment is arranged on the step frame 1 to form a set of complete preparation equipment, and a plurality of process steps can be carried out simultaneously in the production process, so that the production efficiency is improved; the heat generated by diluting concentrated sulfuric acid can be reserved, and when the concentrated sulfuric acid is put into use, a large amount of energy sources needing to be heated are reduced, so that the energy is saved.

Still including PLC controller 9, PLC controller 9 fixed mounting is in one side of step frame 1, PLC controller 9's control output respectively with agitator motor 209 automatically controlled end electric connection, and be provided with the control button who is used for controlling agitator motor 209 and just reverses on PLC controller 9.

By adopting the technical scheme, the PLC 9 is utilized to control all the stirring motors 209, so that the operation is convenient.

The first valve 301, the second valve 501, the third valve 701, and the fourth valve 801 are all set as electric valves, and electric control ends of the first valve 301, the second valve 501, the third valve 701, and the fourth valve 801 are respectively connected with a control output end of the PLC controller 9.

By adopting the above technical scheme, the first valve 301, the second valve 501, the third valve 701 and the fourth valve 801 can be controlled by the PLC controller 9, which is convenient for operation.

The anti-corrosion valve 211 and the water inlet valve 207 are both set to be electric flow valves, and the electric control end of the anti-corrosion valve 211 and the electric control end of the water inlet valve 207 are respectively connected with the control output end of the PLC 9.

By adopting the technical scheme, the water inlet valve 207 is used for injecting pure water, and the injected water amount is controlled by flow; and the corrosion prevention valve 211 can control the amount of the injected concentrated sulfuric acid.

An anti-corrosion temperature sensor is installed on the side wall of the pickling reaction tank 4, the signal output end of the anti-corrosion temperature sensor is electrically connected with the signal input end of the PLC 9, and the control output end of the PLC 9 is electrically connected with the electric control end of the heating wire 402.

By adopting the above technical scheme, the temperature of each reaction tank is detected by the temperature sensor, and then the heating wire 402 is controlled by the PLC 9 to heat up.

Sulphuric acid dilution tank 2 sets up to transparent glass reation kettle, and sulphuric acid dilution tank 2's outside is provided with scale mark 213 on the surface, and blast pipe 208 has been seted up at sulphuric acid dilution tank 2's top, and sampling port 210 has been seted up at sulphuric acid dilution tank 2's top.

Through adopting above-mentioned technical scheme, be used for the step-down through blast pipe 208, avoid diluting the in-process, sulfuric acid dilution tank 2 inside atmospheric pressure is too big, and sample connection 210 can carry out the sample test.

The inside rotation of sulphuric acid dilution tank 2 installs second (mixing) shaft 214, fixedly connected with drainage strip 215 on the inner wall of sulphuric acid dilution tank 2, and the upper end setting of drainage strip 215 is provided with a plurality of reposition of redundant personnel branch 216 at the downside of concentrated sulfuric acid admission pipe 212, and drainage strip 215's lower part.

Through adopting above-mentioned technical scheme, and drainage strip 215 can guide concentrated sulfuric acid to enter into sulphuric acid dilution tank 2 in to the dispersion, be convenient for play the effect of quick dilution.

Limiting convex points 409 are fixedly connected to the inner wall of the flange sleeve 403 on the upper side and the lower side of the filter screen frame 410 respectively.

By adopting the technical scheme, when the filter screen is implemented, the filter screen 406 is made of elastic glass fiber filter cloth, the up-and-down fluctuation of the filter screen frame 410 is limited by the limit salient points 409, and the filter effect is improved by deformation fluctuation under the contact of the convex strips 405.

For the convenience of understanding the technical solutions of the present invention, the following detailed description will be made on the working principle or the operation mode of the present invention in the practical process.

In practical application, a set of multistage reaction filtering equipment is arranged on the step frame 1 to form a set of complete preparation equipment, so that the intermediate transfer process is saved, and intermediate connecting pipelines and transfer equipment are reduced; in the production process, a plurality of process steps can be carried out simultaneously, so that the production efficiency is improved; the concentrated sulfuric acid is diluted and then directly put into the reaction process, and the arc-shaped heat insulation plate 205 is arranged on the sulfuric acid dilution tank 2, so that the heat generated during the dilution of the concentrated sulfuric acid can be reserved, a large amount of energy sources needing to be heated are reduced when the concentrated sulfuric acid is put into use, and the energy is saved; the direct filtration can be carried out at the bottom of the reaction tank through the filtering mechanism, and the direct filtration cannot be exposed in the filtering process, so that the leakage and the risk of sulfuric acid are reduced; meanwhile, filter residues and filtrate are respectively distributed to different reaction tanks positioned at the next stage on the step frame for reaction, and the upper stage, the lower stage and the liquid-residue are separated, so that the management and the maintenance are convenient, and the production safety is improved.

The present invention can be easily implemented by those skilled in the art from the above detailed description. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the basis of the disclosed embodiments, a person skilled in the art can combine different technical features at will, thereby implementing different technical solutions.