阅读说明：本技术 一种连续式电热回转炉及采用该回转炉制备锰酸锂的工艺 (Continuous electric heating rotary furnace and process for preparing lithium manganate by adopting same ) 是由 于伟 于 2020-03-13 设计创作，主要内容包括：本申请涉及一种连续式电热回转炉及采用连续式电热该回转炉制备锰酸锂的工艺,该连续式电热回转炉的炉管部分内部具有炉膛加热区,炉管部分整体与水平面成一定角度,以使炉管部分的进料端高于出料端；炉膛加热区分为若干个温区,每个温区独立控温加热,炉管部分的保温层采用高温陶瓷纤维材料；炉管部分的炉顶采用多段整体组合块结构,各段炉顶整体组合块之间缝隙采用硅酸铝纤维毯塞实密封。本发明的连续式电热回转炉相比传统电热回转炉,增设了更多的保温结构,使炉内的升温和保温的性能大大提升。本发明提供的一种锰酸锂的制备工艺,能够将现有锰酸锂工艺煅烧时间大大缩短,控制在10小时以内,能够提高生产企业的生产效率,降低能耗。(The application relates to a continuous electric heating rotary furnace and a process for preparing lithium manganate by adopting the continuous electric heating rotary furnace, wherein a furnace tube part of the continuous electric heating rotary furnace is internally provided with a hearth heating zone, and the whole furnace tube part forms a certain angle with a horizontal plane, so that a feeding end of the furnace tube part is higher than a discharging end; the heating area of the hearth is divided into a plurality of temperature areas, each temperature area is independently heated at controlled temperature, and the heat insulation layer of the furnace tube part is made of high-temperature ceramic fiber material; the furnace top of the furnace tube part adopts a multi-section integral combination block structure, and gaps among the integral combination blocks of each section of the furnace top are tightly sealed by adopting aluminum silicate fiber blankets. Compared with the traditional electric heating rotary furnace, the continuous electric heating rotary furnace provided by the invention is additionally provided with more heat preservation structures, so that the heating and heat preservation performances in the furnace are greatly improved. The preparation process of lithium manganate provided by the invention can greatly shorten the calcination time of the existing lithium manganate process within 10 hours, improve the production efficiency of production enterprises and reduce energy consumption.)

1. A continuous electric heating rotary furnace is characterized by comprising:

the furnace tube part (1) is internally provided with a hearth heating zone, and the whole furnace tube part (1) forms a certain angle with the horizontal plane so that the feeding end of the furnace tube part (1) is higher than the discharging end; the hearth heating area is divided into a plurality of temperature areas, each temperature area is independently heated at controlled temperature, and the heat insulation layer of the furnace tube part (1) is made of high-temperature ceramic fiber materials; the furnace top of the furnace tube part (1) adopts a multi-section integral combination block structure, and gaps among the integral combination blocks of each section of the furnace top are tightly sealed by adopting aluminum silicate fiber blankets;

the furnace tube transmission device (2) is used for supporting the furnace tube part (1) and driving the furnace tube part (1) to rotate around an axis;

the feeding device (3) is connected with the feeding end of the furnace tube part (1) and is used for guiding materials into the furnace tube part (1);

the outlet sealing bin (4) is connected with the discharge end of the furnace tube part (1) and is used for discharging materials from the interior of the furnace tube part (1);

and the gas path mechanism is used for supplementing air to the hearth in the material sintering process and comprises a gas inlet arranged at one end of the outlet sealing bin (4) and a gas outlet arranged at the feeding device (3).

2. The continuous electrothermal rotary kiln according to claim 1, further comprising a dust seal assembly (5), the dust seal assembly (5) being disposed between the feed end of the furnace tube portion (1) and the feeding device (3) and between the discharge end and the outlet seal bin (4); the dust seal assembly (5) comprises: sealing ring (51), hold-down mechanism (52), butt joint ring (53), sealing ring (51) are fixed furnace tube part (1) feed end and discharge end, the one end of sealing ring (51) has graphite ring (512), butt joint ring (53) are connected through expansion compensator (54) feeder (3) with the one end of export sealed storehouse (4), the terminal surface of butt joint ring (53) with the terminal surface laminating of graphite ring (512), hold-down mechanism (52) are used for with butt joint ring (53) with graphite ring (512) compress tightly each other, hold-down mechanism (52) can be equivalent to sealing ring (51) or butt joint ring (53) rotate.

3. The continuous electrothermal rotary furnace according to claim 2, wherein the sealing ring (51) comprises:

a fixing ring (511) fixed to the circumference of the furnace tube portion (1);

a first pressure bearing sheet (513) fixed to one side of the fixing ring (511);

a graphite ring (512) fixed to one side of the first pressure bearing sheet (513);

the pressing mechanism (52) comprises a second pressure bearing sheet (521) and a bearing sheet pressing piece (522), a ball (523) is arranged between the second pressure bearing sheet (521) and the first pressure bearing sheet (513), two ends of the bearing sheet pressing piece (522) are respectively connected with the butt joint ring (53) and the second pressure bearing sheet (521), and the butt joint ring (53) is pressed towards the direction of the second pressure bearing sheet (521).

4. A continuous electrothermal rotary kiln according to claim 3, wherein the furnace tube driving device (2) comprises:

the supporting rollers (21) are arranged at two ends of the furnace tube part (1) and used for supporting the furnace tube part (1), and the supporting rollers (21) can be adjusted along the radial direction of the furnace tube part (1);

a support rolling disc (22) which is arranged on the furnace tube part (1) and can be rotatably arranged on the supporting roller (21);

the positioning wheels are arranged on two sides of the support rolling disc (22) and are used for rotationally positioning the furnace tube; and the outer side position of the positioning wheel is also provided with a protection limiting structure to prevent the positioning wheel from derailing.

5. Continuous electrothermal rotary furnace according to any one of claims 1 to 4, characterized in that the feeding device (3) comprises:

a transition bin (31);

the material loosening device (32) is connected below the transition bin (31) and is used for loosening the materials;

and the bin wall vibration device (33) is arranged on the side wall of the transition bin (31) and is used for shaking the transition bin (31).

6. A continuous electrothermal rotary kiln according to any one of claims 1 to 5, characterized in that the furnace heating zone of the furnace tube section (1) is provided with heating elements comprising:

the high-temperature corundum ceramic tube is rod-shaped and can be detached;

the high-temperature alloy electric heating wire is wound into a spiral shape and is embedded in the high-temperature corundum ceramic tube.

7. The continuous electrothermal rotary furnace according to any one of claims 1 to 6, wherein the furnace tube part (1) comprises a plurality of sections of tube bodies, the tube bodies are spliced and welded with each other, the welding seams between the tube bodies are sealed and welded by a high-power automatic submerged arc welding machine, and the welding seams are subjected to flaw detection, so that the strength of the welding seams of the furnace tube is ensured to be reliable, and no internal defects exist; the inner welded junctions are sealed in an argon arc welding mode, the inner surfaces of the welded pipe body and the inner components are polished and passivated by acid pickling after being welded, and burrs and welding slag in the interior of the furnace pipe are eliminated.

8. A calcination process method of lithium manganate is characterized in that a lithium manganate precursor is placed in a continuous electric heating rotary furnace according to any one of claims 1 to 7, the temperature in the furnace is heated to 150 ℃ within 7.5 to 15 minutes, and the lithium manganate is calcined for 30 to 60 minutes at 150 ℃;

then, the temperature in the furnace is increased from 150 ℃ to 600 ℃ within 22.5-45 minutes, and then the temperature is maintained at 600 ℃ for calcination for 45-90 minutes;

and then, the temperature in the furnace is increased from 600 ℃ to 740 ℃ within 7-14 minutes, the mixture is calcined at 740 ℃ for 150-300 minutes, and the temperature is naturally reduced to room temperature after the calcination is finished, so that the lithium manganate product is obtained.

9. The method for calcining lithium manganate as recited in claim 8, wherein air is continuously introduced during the whole heating process, and the air flow rate is 30 to 50L/min.

10. The calcination process method of lithium manganate according to claim 8 or 9, wherein the furnace tube is kept rotating during the whole heating process, and the rotation speed is controlled to be 2-10 rpm/h.

Technical Field

The application belongs to the technical field of rotary furnaces, and particularly relates to a continuous electric heating rotary furnace.

Background

The rotary furnace is used as thermal equipment for carrying out heat treatment on bulk powder or particles, and is widely popularized and used in the industries of chemical engineering, metallurgy, cement, refractory materials, non-metallic ores and the like in recent years along with the continuous development of scientific technology.

Lithium manganate is one of lithium ion anode materials with a relatively promising prospect, at present, the lithium manganate is mostly used for high-temperature calcination in mass production, the existing calcining furnace is not tight enough in heat preservation structure, the heating and heat preservation performances are poor, the reaction time for carrying out the lithium manganate calcining process is usually more than 20 hours, the production efficiency of production enterprises is greatly limited, and the resource utilization rate is low.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in order to solve the defects of the sealing structure of the rotary furnace in the prior art, the continuous electric heating rotary furnace is provided.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a continuous electrothermal rotary furnace comprising:

the furnace tube part is internally provided with a hearth heating area, and the whole furnace tube part forms a certain angle with the horizontal plane so that the feeding end of the furnace tube part is higher than the discharging end; the hearth heating area is divided into a plurality of temperature areas, each temperature area is independently heated at controlled temperature, and the heat insulation layer of the furnace tube part is made of high-temperature ceramic fiber materials; the furnace top of the furnace tube part adopts a multi-section integral combination block structure, and gaps among the integral combination blocks of each section of the furnace top are tightly sealed by adopting aluminum silicate fiber blankets;

the furnace tube transmission device is used for supporting the furnace tube part and driving the furnace tube part to rotate around an axis;

the feeding device is connected with the feeding end of the furnace tube part and is used for guiding materials into the interior of the furnace tube part;

the outlet sealing bin is connected with the discharge end of the furnace tube part and is used for discharging the materials from the interior of the furnace tube part;

the dustproof sealing components are arranged between the feeding end of the furnace tube part and the feeding device and between the discharging end and the outlet sealing bin; the dust seal assembly includes: the sealing ring is fixed at the feeding end and the discharging end of the furnace tube part, one end of the sealing ring is provided with a graphite ring, the butt joint ring is connected with the feeding device and one end of the outlet sealing bin through an expansion compensator, the end face of the butt joint ring is attached to the end face of the graphite ring, the pressing mechanism is used for mutually pressing the butt joint ring and the graphite ring, and the pressing mechanism can rotate equivalently to the sealing ring or the butt joint ring;

and the gas path mechanism is used for supplementing air to the hearth in the material sintering process and comprises a gas inlet arranged at one end of the outlet sealing bin and a gas outlet arranged at the feeding device.

Preferably, the continuous electric heating rotary furnace also comprises a dustproof sealing assembly, wherein the dustproof sealing assembly is arranged between the feeding end of the furnace tube part and the feeding device and between the discharging end of the furnace tube part and the outlet sealing bin; the dust seal assembly includes: sealing ring, hold-down mechanism, butt joint ring, the sealing ring is fixed furnace tube part feed end and discharge end, the one end of sealing ring has the graphite ring, the butt joint ring is connected through expansion compensator feeder with the one end in export sealed storehouse, the terminal surface of butt joint ring with the terminal surface laminating of graphite ring, hold-down mechanism be used for with the butt joint ring with the graphite ring compresses tightly each other, hold-down mechanism can be equivalent to the sealing ring or the butt joint ring rotates.

Preferably, the continuous electrothermal rotary kiln of the present invention, the sealing ring comprises:

the fixing ring is fixed on the circumference of the furnace tube part;

the first pressure bearing sheet is fixed on one side of the fixing ring;

the graphite ring is fixed on one side of the first pressure bearing sheet;

the pressing mechanism comprises a second pressure bearing piece and a bearing piece pressing piece, a ball is arranged between the second pressure bearing piece and the first pressure bearing piece, two ends of the bearing piece pressing piece are respectively connected with the butt joint ring and the second pressure bearing piece, and the butt joint ring is pressed towards the direction of the second pressure bearing piece.

Preferably, the continuous electrothermal rotary furnace of the present invention, the furnace tube driving device comprises:

the supporting rollers are arranged at two ends of the furnace tube part and used for supporting the furnace tube part, and the supporting rollers can be adjusted along the radial direction of the furnace tube part;

the supporting rolling disc is arranged on the furnace tube part and can be rotatably arranged on the supporting roller;

the positioning wheels are arranged on two sides of the support rolling disc and are used for rotationally positioning the furnace tube; and the outer side position of the positioning wheel is also provided with a protection limiting structure to prevent the positioning wheel from derailing.

Preferably, according to the continuous electric heating rotary furnace, an automatic knocking device is arranged at the feeding end of the furnace tube part to prevent products from being bonded on the inner wall of the furnace tube.

Preferably, in the continuous electrothermal rotary furnace, the exhaust port is connected with a bag-type dust collector through an exhaust pipeline, and a micro-pressure meter and a pressure regulating valve are arranged on the exhaust pipeline.

Preferably, the continuous electrothermal rotary furnace of the present invention, the feeding device comprises:

a transition bin;

the material loosening device is connected below the transition bin and is used for loosening the materials;

and the bin wall vibration device is arranged on the side wall of the transition bin and used for shaking the transition bin.

Preferably, according to the continuous electric heating rotary furnace, the air inlet at one end of the outlet sealed bin is provided with the air supplementing adjusting valve, and the amount of air supplemented into the furnace tube part can be adjusted by adjusting the opening degree of the air supplementing adjusting valve; the air inlet is also provided with a dust removal filtering device.

Preferably, the continuous electrothermal rotary kiln of the invention is provided with a heating element in the hearth heating zone of the furnace tube part, and the heating element comprises:

the high-temperature corundum ceramic tube is rod-shaped and can be detached;

the high-temperature alloy electric heating wire is wound into a spiral shape and is embedded in the high-temperature corundum ceramic tube.

Preferably, the furnace tube part of the continuous electrothermal rotary furnace comprises a plurality of sections of tube bodies, the tube bodies are spliced and welded with each other, welding seams between the tube bodies are sealed and welded by a high-power automatic submerged arc welding machine, and flaw detection is carried out on the welding seams, so that the strength of the welding seams of the furnace tube is ensured to be reliable, and no internal defects exist; the inner welded junctions are sealed in an argon arc welding mode, the inner surfaces of the welded pipe body and the inner components are polished and passivated by acid pickling after being welded, and burrs and welding slag in the interior of the furnace pipe are eliminated.

Preferably, the furnace tube transmission device of the continuous electric heating rotary furnace comprises a driving device for driving the furnace tube to rotate partially, and the driving device comprises a motor and an emergency hand-operated mechanism.

A lithium manganate precursor is placed in the continuous electric heating rotary furnace, the temperature in the furnace is heated to 150 ℃ within 7.5-15 minutes, and the lithium manganate is calcined for 30-60 minutes at 150 ℃;

then, the temperature in the furnace is increased from 150 ℃ to 600 ℃ within 22.5-45 minutes, and then the temperature is maintained at 600 ℃ for calcination for 45-90 minutes;

and then, the temperature in the furnace is increased from 600 ℃ to 740 ℃ within 7-14 minutes, the mixture is calcined at 740 ℃ for 150-300 minutes, and the temperature is naturally reduced to room temperature after the calcination is finished, so that the lithium manganate product is obtained.

Preferably, in the calcination process method of lithium manganate, air is continuously introduced in the whole heating process, and the air flow is 30-50L/min.

Preferably, in the calcination process method of lithium manganate, the furnace tube keeps rotating in the whole heating process, and the rotating speed is controlled to be 2-10 revolutions per hour.

The invention has the beneficial effects that: compared with the traditional electric heating rotary furnace, the continuous electric heating rotary furnace provided by the invention is additionally provided with more heat preservation structures, so that the heating and heat preservation performances in the furnace are greatly improved.

The preparation process of lithium manganate provided by the invention can greatly shorten the calcination time of the existing lithium manganate process within 10 hours, improve the production efficiency of production enterprises and reduce energy consumption.

Drawings

The technical solution of the present application is further explained below with reference to the drawings and the embodiments.

FIG. 1 is a schematic view of a continuous electrothermal rotary kiln according to an embodiment of the present application;

FIG. 2 is a schematic view of a dust seal assembly attachment configuration according to an embodiment of the present application;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic view of a furnace tube portion feed end structure according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a feeding device according to an embodiment of the present application.

The reference numbers in the figures are:

1 furnace tube part

2 furnace tube transmission device

3 feeding device

4 outlet sealed cabin

5 dust seal assembly

6 furnace bottom girder

7 temperature reduction cooling mechanism

8 wireless temperature measuring device

12 automatic knocking device

21 roller

22 support rolling disk

31 transition feed bin

32 material loosening device

33 wall vibration device

34 feeding chute

41 air inlet

51 sealing ring

52 pressing mechanism

53 butt-joint ring

54 expansion compensator

511 fixed ring

512 graphite ring

513 first pressure bearing sheet

521 second pressure bearing sheet

522 bearing sheet pressing piece

523 balls.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the scope of the present application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.

The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.