Cement-free castable for rotary kiln of lithium battery recycling and preparation method thereof

Abstract

The application discloses a kind of lithium electricity recovery rotary kiln refractory cementless castable, including the following mass parts of raw materials: 65-80 parts of coke spar, 10-20 parts of quartz sand, 3-8 parts of silica fume, 2-5 parts of alumina powder, 1-2 parts of modified mullite fiber, 6-12 parts of binder, 0.1-0.3 parts of dispersant, 0.1-0.2 parts of explosion-proof fiber, 0.01-0.02 parts of citric acid.The application also discloses a preparation method of the above-mentioned lithium electricity recovery rotary kiln refractory cementless castable.The lithium electricity recovery rotary kiln cementless castable of the application has high strength, excellent thermal shock resistance and corrosion resistance, which can ensure the normal operation of lithium electricity recovery rotary kiln and prolong its service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refractory materials, and particularly relates to a cement-free castable for a rotary kiln for lithium battery recycling and a preparation method thereof. BACKGROUND

[0002] With the development of new energy and the automobile industry, the application of lithium ion batteries has increased substantially, resulting in a large number of waste lithium batteries. The electrode active materials of the waste lithium batteries contain a large amount of rare and precious metal materials, and the disposal of the waste lithium batteries poses a safety hazard and a threat to the environment, and therefore needs to be recycled. At present, the recycling method for the waste lithium batteries mainly comprises the following steps: first, crushing the lithium battery; then, removing organic matters in a rotary kiln through pyrolysis; and further separating and recycling metal active substances. Therefore, the castable for the rotary kiln for waste lithium battery recycling needs to have high strength, excellent thermal shock resistance and corrosion resistance.

[0003] The cement-free castable refers to a castable that does not contain cement binders, but relies on micro powder or sol as a binder to be combined through condensation. The cement-free castable has low impurity content, and therefore will not cause the high-temperature resistance and the molten slag corrosion resistance of the castable to decrease significantly, and is suitable for use in occasions with high requirements on the high-temperature resistance and the corrosion resistance. At present, the binder of the cement-free castable is mainly silica sol or micro powder, and the high-temperature strength and the thermal shock resistance still need to be improved. Therefore, it is necessary to develop a cement-free castable for a rotary kiln for lithium battery recycling, which has excellent high-temperature strength and thermal shock resistance, so as to better ensure the normal operation of the rotary kiln for lithium battery recycling and prolong the service life thereof. SUMMARY

[0004] Based on the technical problems in the background art, the present application provides a cement-free castable for a rotary kiln for lithium battery recycling and a preparation method thereof.

[0005] The cement-free castable for a rotary kiln for lithium battery recycling provided by the present application comprises the following raw materials in parts by mass: 65-80 parts of flint clay, 10-20 parts of quartz sand, 3-8 parts of silica fume, 2-5 parts of alumina micro powder, 1-2 parts of modified mullite fiber, 6-12 parts of a binder, 0.1-0.3 parts of a dispersant, 0.1-0.2 parts of explosion-proof fiber and 0.01-0.02 parts of citric acid.

[0006] The preparation method of the modified mullite fiber comprises the following steps: adding mullite fiber into ZrO2-mullite composite sol, uniformly dispersing, and then freeze-drying to obtain the modified mullite fiber.

[0007] The binder is silica sol, aluminum sol or a combination thereof.

[0008] Preferably, the ZrO2-mullite composite sol is obtained by mixing ZrO2 sol and mullite sol in a mass ratio of (0.15-0.25):1 and diluting with deionized water, wherein the solid content of the ZrO2 sol is 20-30%, and the solid content of the mullite sol is 20-30%; the solid content of the ZrO2-mullite composite sol is 0.5-1%.

[0009] Preferably, the length of the mullite fiber is 20-300 μm.

[0010] Preferably, the mass ratio of the mullite fiber to the ZrO2-mullite composite sol is 1:(8-10).

[0011] Preferably, the flint stone is composed of flint stone particles with a particle size less than 5 mm and greater than or equal to 3 mm, flint stone particles with a particle size less than 3 mm and greater than or equal to 1 mm, flint stone particles with a particle size less than 1 mm and greater than or equal to 0.088 mm, and flint stone powder with a particle size less than 0.088 mm in a mass ratio of (20-30):(15-18):(16-22):(12-16).

[0012] Preferably, the quartz sand is composed of quartz sand with a particle size less than 0.5 mm and greater than or equal to 0.074 mm and quartz sand with a particle size less than 0.074 mm in a mass ratio of (5-10):(5-10).

[0013] Preferably, the binding agent is composed of silicon sol and aluminum sol in a mass ratio of (1-3):1.

[0014] Preferably, the solid content of the silicon sol is 25-40%, and the solid content of the aluminum sol is 20-40%.

[0015] Preferably, the dispersant is at least one of sodium tripolyphosphate, sodium hexametaphosphate, and sodium polyacrylate.

[0016] A preparation method of the cement-free castable for a lithium battery recycling rotary kiln, comprising the following steps: first, uniformly mixing flint stone, quartz sand, silica fume, aluminum oxide powder, and modified mullite fiber, then uniformly mixing a dispersant, explosion-proof fiber, and citric acid, and then uniformly mixing a binding agent and an appropriate amount of water to obtain the cement-free castable.

[0017] Preferably, in the preparation method of the cement-free castable for a lithium battery recycling rotary kiln, the amount of water is 1-5% of the mass of the castable.

[0018] The beneficial effects of the present application are as follows:

[0019] The castable of the present application takes flint as the matrix, and the flint has excellent high-temperature resistance and corrosion resistance, and is suitable for application in industrial kiln refractories; takes silica sol, aluminum sol or a combination thereof as the binder, and does not use cement binder, so that the castable has less impurity content, and the high-temperature resistance and the slag corrosion resistance of the castable can be further improved; the ZrO2-mullite composite sol modified mullite fiber is added in the castable, and mullite crystal nucleus is formed on the surface of the mullite fiber, so that the mullite whisker with the mullite fiber as the center is uniformly distributed in the castable after high-temperature treatment, and the ZrO2 can promote the formation of the whisker and improve the bonding performance of the mullite fiber and the castable, so that the castable after high-temperature treatment has a three-dimensional network structure formed by the closely bonded mullite fiber and the mullite whisker on the surface of the mullite fiber, and the high-temperature strength and the thermal shock resistance of the castable can be significantly improved. The cement-free castable for lithium battery recycling rotary kiln has high strength, excellent thermal shock resistance and corrosion resistance, can ensure the normal operation of the lithium battery recycling rotary kiln, and prolong the service life of the lithium battery recycling rotary kiln. DETAILED DESCRIPTION

[0020] Hereinafter, the technical solutions of the present application will be described in detail through specific examples.

[0021] Example 1

[0022] A cement-free castable for lithium battery recycling rotary kiln refractory, comprising the following raw materials by mass: 77 parts of flint, 16 parts of quartz sand, 5 parts of silica ash, 3 parts of aluminum oxide powder, 1.5 parts of modified mullite fiber, 10 parts of binder, 0.1 part of sodium tripolyphosphate, 0.1 part of explosion-proof fiber, and 0.01 part of citric acid;

[0023] The flint is composed of flint particles with a particle size of less than 5 mm and greater than or equal to 3 mm, flint particles with a particle size of less than 3 mm and greater than or equal to 1 mm, flint particles with a particle size of less than 1 mm and greater than or equal to 0.088 mm, and flint powder with a particle size of less than 0.088 mm, and the mass ratio is 26:16:20:15;

[0024] The quartz sand is composed of quartz sand with a particle size of less than 0.5 mm and greater than or equal to 0.074 mm, and quartz sand with a particle size of less than 0.074 mm, and the mass ratio is 8:8;

[0025] The preparation method of the modified mullite fiber comprises the following steps: adding mullite fibers with a length of 100-200 microns into ZrO2-mullite composite sol with a solid content of 0.8%, uniformly dispersing, and then freeze-drying, so as to obtain the modified mullite fiber, wherein the mass ratio of the mullite fiber to the ZrO2-mullite composite sol is 1:8.5; the ZrO2-mullite composite sol is obtained by mixing ZrO2 sol and mullite sol according to a mass ratio of 0.2:1, and then diluting with deionized water, wherein the solid content of the ZrO2 sol is 25%, and the solid content of the mullite sol is 25%; and the preparation method of the ZrO2 sol and the mullite sol is as follows: according to the stoichiometric ratio of Al2O3:SiO2=3:2, aluminum nitrate is dissolved in a silica sol solution, then ammonia water is added at room temperature, and stirring is carried out for 6 hours, so as to obtain the mullite sol.

[0026] The binder is composed of silica sol with a solid content of 30% and aluminum sol with a solid content of 30% according to a mass ratio of 2:1.

[0027] The preparation method of the cement-free castable for the refractory of the lithium battery recycling rotary kiln is as follows: first, uniformly mix flint, quartz sand, silica fume, alumina micropowder and modified mullite fiber, then uniformly mix the dispersant, explosion-proof fiber and citric acid, and then uniformly mix the binder and water accounting for 3% of the mass of the castable, so as to obtain the cement-free castable.

[0028] Example 2

[0029] A cement-free castable for the refractory of a lithium battery recycling rotary kiln comprises the following raw materials in mass parts: flint 65 parts, quartz sand 20 parts, silica fume 3 parts, alumina micropowder 5 parts, modified mullite fiber 2 parts, binder 6 parts, sodium tripolyphosphate 0.1 part, explosion-proof fiber 0.1 part, and citric acid 0.01 part.

[0030] The flint is composed of flint particles with a particle size of less than 5 mm and greater than or equal to 3 mm, flint particles with a particle size of less than 3 mm and greater than or equal to 1 mm, flint particles with a particle size of less than 1 mm and greater than or equal to 0.088 mm, and flint powder with a particle size of less than 0.088 mm according to a mass ratio of 20:15:16:12.

[0031] The quartz sand is composed of quartz sand with a particle size of less than 0.5 mm and greater than or equal to 0.074 mm and quartz sand with a particle size of less than 0.074 mm according to a mass ratio of 5:10.

[0032] The preparation method of the modified mullite fiber comprises the following steps: adding mullite fibers with a length of 100-200 microns into ZrO2-mullite composite sol with a solid content of 0.5%, uniformly dispersing, and then freeze-drying, so as to obtain the modified mullite fiber, wherein the mass ratio of the mullite fiber to the ZrO2-mullite composite sol is 1:8; the ZrO2-mullite composite sol is obtained by mixing ZrO2 sol and mullite sol according to a mass ratio of 0.15:1 and then diluting with deionized water, wherein the solid content of the ZrO2 sol is 20%, and the solid content of the mullite sol is 20%; and the preparation method of the ZrO2 sol and the mullite sol is as follows: according to the stoichiometric ratio of Al2O3:SiO2=3:2, aluminum nitrate is dissolved in a silica sol solution, then ammonia water is added at room temperature, and stirring is carried out for 6 hours, so as to obtain the mullite sol;

[0033] The binder is composed of silica sol with a solid content of 30% and aluminum sol with a solid content of 30% according to a mass ratio of 2:1.

[0034] The preparation method of the cement-free castable for the rotary kiln for lithium battery recycling is as follows: first, uniformly mix flint, quartz sand, silica fume, alumina micropowder and modified mullite fiber, then uniformly mix the dispersant, explosion-proof fiber and citric acid, and then uniformly mix the binder and water accounting for 3% of the mass of the castable, so as to obtain the cement-free castable.

[0035] Example 3

[0036] A cement-free castable for the rotary kiln for lithium battery recycling comprises the following raw materials in mass parts: flint 80 parts, quartz sand 10 parts, silica fume 8 parts, alumina micropowder 2 parts, modified mullite fiber 1 part, binder 12 parts, sodium tripolyphosphate 0.3 parts, explosion-proof fiber 0.2 parts, and citric acid 0.02 parts.

[0037] The flint is composed of flint particles with a particle size of less than 5 mm and greater than or equal to 3 mm, flint particles with a particle size of less than 3 mm and greater than or equal to 1 mm, flint particles with a particle size of less than 1 mm and greater than or equal to 0.088 mm, and flint powder with a particle size of less than 0.088 mm according to a mass ratio of 30:18:22:16.

[0038] The quartz sand is composed of quartz sand with a particle size of less than 0.5 mm and greater than or equal to 0.074 mm and quartz sand with a particle size of less than 0.074 mm according to a mass ratio of 10:5.

[0039] The preparation method of the modified mullite fiber comprises the following steps: adding mullite fibers with a length of 100-200 microns into ZrO2-mullite composite sol with a solid content of 1%, uniformly dispersing, and then freeze-drying, so as to obtain the modified mullite fiber, wherein the mass ratio of the mullite fiber to the ZrO2-mullite composite sol is 1:10; the ZrO2-mullite composite sol is obtained by mixing ZrO2 sol and mullite sol according to a mass ratio of 0.25:1 and then diluting with deionized water, wherein the solid content of the ZrO2 sol is 30%, and the solid content of the mullite sol is 30%; and the preparation method of the mullite sol is as follows: according to the stoichiometric ratio of Al2O3:SiO2=3:2, aluminum nitrate is weighed and dissolved in a silica sol solution, then ammonia water is added at normal temperature and stirred for 8 hours to obtain the mullite sol.

[0040] The binder is composed of silica sol with a solid content of 30% and aluminum sol with a solid content of 30% according to a mass ratio of 2:1.

[0041] The preparation method of the above-mentioned cement-free castable for rotary kiln of lithium battery recycling is as follows: first, uniformly mix flint, quartz sand, silica fume, alumina micropowder and modified mullite fiber, then uniformly mix the dispersant, explosion-proof fiber and citric acid, and then uniformly mix the binder and water accounting for 3% of the mass of the castable, so as to obtain the cement-free castable.

[0042] Comparative Example 1

[0043] A cement-free castable comprises the following raw materials in mass parts: flint 77 parts, quartz sand 16 parts, silica fume 5 parts, alumina micropowder 3 parts, mullite fiber with a length of 100-200 microns 1.5 parts, binder 10 parts, sodium tripolyphosphate 0.1 part, explosion-proof fiber 0.1 part, and citric acid 0.01 part.

[0044] The flint is composed of flint particles with a particle size of less than 5 mm and greater than or equal to 3 mm, flint particles with a particle size of less than 3 mm and greater than or equal to 1 mm, flint particles with a particle size of less than 1 mm and greater than or equal to 0.088 mm, and flint powder with a particle size of less than 0.088 mm according to a mass ratio of 26:16:20:15.

[0045] The quartz sand is composed of quartz sand with a particle size of less than 0.5 mm and greater than or equal to 0.074 mm and quartz sand with a particle size of less than 0.074 mm according to a mass ratio of 8:8.

[0046] The binder is composed of silica sol with a solid content of 30% and aluminum sol with a solid content of 30% according to a mass ratio of 2:1.

[0047] The preparation method of the cementless castable is as follows: firstly, mix the flint clay, quartz sand, silica fume, alumina micropowder and mullite fiber uniformly, then mix the dispersing agent, explosion-proof fiber and citric acid uniformly, and then add the binder and water accounting for 3% of the mass of the castable, and stir uniformly to obtain the cementless castable.

[0048] Comparative Example 2

[0049] A cementless castable comprises the following raw materials by mass: flint clay 77 parts, quartz sand 16 parts, silica fume 5 parts, alumina micropowder 3 parts, mullite fiber with a length of 100-200 μm 1.5 parts, ZrO2-mullite micropowder 0.1 part, binder 10 parts, sodium tripolyphosphate 0.1 part, explosion-proof fiber 0.1 part, and citric acid 0.01 part.

[0050] The flint clay is composed of flint clay particles with a particle size less than 5 mm and greater than or equal to 3 mm, flint clay particles with a particle size less than 3 mm and greater than or equal to 1 mm, flint clay particles with a particle size less than 1 mm and greater than or equal to 0.088 mm, and flint clay powder with a particle size less than 0.088 mm, with a mass ratio of 26:16:20:15;

[0051] The quartz sand is composed of quartz sand with a particle size less than 0.5 mm and greater than or equal to 0.074 mm and quartz sand with a particle size less than 0.074 mm, with a mass ratio of 8:8;

[0052] The ZrO2-mullite micropowder is obtained by freeze-drying of ZrO2-mullite composite sol, wherein the ZrO2-mullite composite sol is obtained by mixing ZrO2 sol with a solid content of 25% and mullite sol with a solid content of 25% at a mass ratio of 0.2:1, and the mullite sol is prepared by: taking aluminum nitrate and dissolving it in silica sol solution according to the stoichiometric ratio of Al2O3:SiO2=3:2, then adding ammonia water at room temperature and stirring for 6 h to obtain the mullite sol;

[0053] The binder is composed of silica sol with a solid content of 30% and aluminum sol with a solid content of 30% at a mass ratio of 2:1.

[0054] The preparation method of the cementless castable is as follows: firstly, mix the flint clay, quartz sand, silica fume, alumina micropowder, mullite fiber and ZrO2-mullite micropowder uniformly, then mix the dispersing agent, explosion-proof fiber and citric acid uniformly, and then add the binder and water accounting for 3% of the mass of the castable, and stir uniformly to obtain the cementless castable.

[0055] Comparative Example 3

[0056] Anhydrous cement casting material, comprising the following raw materials by mass: 77 parts of flint, 16 parts of quartz sand, 5 parts of silica fume, 3 parts of alumina powder, 1.5 parts of modified mullite fiber, 10 parts of binder, 0.1 part of sodium tripolyphosphate, 0.1 part of explosion-proof fiber, and 0.01 part of citric acid;

[0057] The flint is composed of flint particles with a particle size less than 5 mm and greater than or equal to 3 mm, flint particles with a particle size less than 3 mm and greater than or equal to 1 mm, flint particles with a particle size less than 1 mm and greater than or equal to 0.088 mm, and flint powder with a particle size less than 0.088 mm, in a mass ratio of 26:16:20:15;

[0058] The quartz sand is composed of quartz sand with a particle size less than 0.5 mm and greater than or equal to 0.074 mm and quartz sand with a particle size less than 0.074 mm, in a mass ratio of 8:8;

[0059] The preparation method of the modified mullite fiber comprises the following steps: adding mullite fiber with a length of 100-200 μm into ZrO2 sol diluent with a solid content of 0.8%, uniformly dispersing, and then freeze-drying, to obtain the modified mullite fiber, wherein the mass ratio of the mullite fiber to the ZrO2 sol diluent is 1:8.5.

[0060] The binder is composed of silica sol with a solid content of 30% and aluminum sol with a solid content of 30%, in a mass ratio of 2:1.

[0061] The preparation method of the anhydrous cement casting material comprises the following steps: uniformly mixing flint, quartz sand, silica fume, alumina powder, and modified mullite fiber, uniformly mixing dispersing agent, explosion-proof fiber, and citric acid, and then adding binder and water equivalent to 3% of the mass of the casting material, and uniformly stirring, to obtain the anhydrous cement casting material.

[0062] Comparative Example 4

[0063] Anhydrous cement casting material, comprising the following raw materials by mass: 77 parts of flint, 16 parts of quartz sand, 5 parts of silica fume, 3 parts of alumina powder, 1.5 parts of modified mullite fiber, 10 parts of binder, 0.1 part of sodium tripolyphosphate, 0.1 part of explosion-proof fiber, and 0.01 part of citric acid;

[0064] The flint is composed of flint particles with a particle size less than 5 mm and greater than or equal to 3 mm, flint particles with a particle size less than 3 mm and greater than or equal to 1 mm, flint particles with a particle size less than 1 mm and greater than or equal to 0.088 mm, and flint powder with a particle size less than 0.088 mm, in a mass ratio of 26:16:20:15;

[0065] The quartz sand is composed of quartz sand with a particle size less than 0.5 mm and greater than or equal to 0.074 mm and quartz sand with a particle size less than 0.074 mm, in a mass ratio of 8:8;

[0066] The preparation method of the modified mullite fiber comprises: adding mullite fibers with a length of 100-200 μm into a mullite sol diluent with a solid content of 0.8%, uniformly dispersing, and then freeze-drying, to obtain the modified mullite fiber, wherein the mass ratio of the mullite fiber to the mullite sol diluent is 1:8.5; the preparation method of the mullite sol diluent comprises: according to the stoichiometric ratio of Al2O3:SiO2=3:2, aluminum nitrate is weighed and dissolved in a silica sol solution, then ammonia water is added at normal temperature and stirred for 6 h to obtain a mullite sol with a solid content of 25%, and then the mullite sol is diluted with deionized water to obtain the mullite sol diluent;

[0067] The binder is composed of silica sol with a solid content of 30% and aluminum sol with a solid content of 30% at a mass ratio of 2:1.

[0068] The preparation method of the above-mentioned cement-free castable for the rotary kiln for lithium battery recycling comprises: first uniformly mixing flint, quartz sand, silica fume, alumina micropowder and modified mullite fiber, then uniformly mixing the dispersant, explosion-proof fiber and citric acid, and then uniformly stirring the binder and water equivalent to 3% of the mass of the castable, to obtain the cement-free castable.

[0069] Test example

[0070] The castables of Example 1 and Comparative Examples 1-4 are respectively made into samples with a size of 160 mm×40 mm×40 mm, dried at 110°C, calcined at 1500°C for 3 h, and then the compressive strength (GB / T 5072-2008) and the bending strength (GB / T 3001-2007) of the samples after heat treatment at different temperatures are respectively measured.

[0071] The castables of Example 1 and Comparative Examples 1-4 are respectively made into samples with a size of 160 mm×40 mm×40 mm, dried at 110°C, calcined at 1300°C for 3 h, and then the thermal shock resistance of the samples is tested, and the testing method is as follows: the electric furnace is heated to 1100±10°C and kept for 30 min, then the sample is placed in the electric furnace and kept at 1100°C for 15 min, then the sample is quickly cooled in the circulating water for 3 min, and then the sample is taken out and placed in the air until room temperature. After 5 cycles of treatment, the residual bending strength retention rate of the sample is calculated, and the residual bending strength retention rate = residual bending strength after thermal shock treatment / bending strength before thermal shock treatment×100%.

[0072] The test results are shown in Table 1.

[0073] Table 1

[0074]

[0075]

[0076] Therefore, the cementless castable of the application has been significantly improved in high-temperature strength and thermal shock resistance.

[0077] The above merely provides the preferred embodiments of the application, but the protection scope of the application is not limited thereto, and any person skilled in the art, according to the technical scheme and the inventive concept of the application, makes equivalent replacement or change within the technical range disclosed by the application, which should be covered within the protection scope of the application.

Claims

1. A lithium battery recycling rotary kiln refractory cement-free castable, characterized by, The raw materials include the following quality parts: 65-80 parts of flint clay, 10-20 parts of quartz sand, 3-8 parts of silica fume, 2-5 parts of alumina powder, 1-2 parts of modified mullite fiber, 6-12 parts of binder, 0.1-0.3 parts of dispersant, 0.1-0.2 parts of anti-explosion fiber, and 0.01-0.02 parts of citric acid; The preparation method of the modified mullite fiber comprises the following steps: adding mullite fiber into ZrO2-mullite composite sol, uniformly dispersing, and then freeze-drying to obtain the modified mullite fiber; the ZrO2-mullite composite sol is obtained by mixing ZrO2 sol and mullite sol at a mass ratio of (0.15-0.25):1, and then diluting with deionized water, wherein the solid content of the ZrO2 sol is 20-30%, the solid content of the mullite sol is 20-30%, and the solid content of the ZrO2-mullite composite sol is 0.5-1%; the mass ratio of the mullite fiber to the ZrO2-mullite composite sol is 1:(8-10). The binder is silica sol, aluminum sol or a combination thereof.

2. The lithium electric recovery rotary kiln refractory cement-free castable according to claim 1, characterized by, The length of the mullite fiber is 20-300 μm.

3. The lithium electric recovery rotary kiln refractory cement-free castable according to claim 1, characterized by, The flint clay is composed of flint clay particles with a particle size of less than 5 mm and greater than or equal to 3 mm, flint clay particles with a particle size of less than 3 mm and greater than or equal to 1 mm, flint clay particles with a particle size of less than 1 mm and greater than or equal to 0.088 mm, and flint clay powder with a particle size of less than 0.088 mm, at a mass ratio of (20-30):(15-18):(16-22):(12-16).

4. The lithium electric recovery rotary kiln refractory cement-free castable according to claim 1, characterized by, The quartz sand is composed of quartz sand with a particle size of less than 0.5 mm and greater than or equal to 0.074 mm, and quartz sand with a particle size of less than 0.074 mm, at a mass ratio of (5-10):(5-10).

5. The lithium electric recovery rotary kiln refractory cement-free castable according to claim 1, characterized by, The binder is composed of silica sol and aluminum sol at a mass ratio of (1-3):

1.

6. The lithium electric recovery rotary kiln refractory cement-free castable according to claim 1, characterized by, The solid content of the silica sol is 25-40%, and the solid content of the aluminum sol is 20-40%.

7. The lithium electric recovery rotary kiln refractory cement-free castable according to claim 1, characterized by, The dispersant is at least one of sodium tripolyphosphate, sodium hexametaphosphate and sodium polyacrylate.

8. A method for producing the cement-free castable for rotary kiln for lithium electric recovery according to any one of claims 1 to 7, characterized by, The method comprises the following steps: firstly, uniformly mixing flint clay, quartz sand, silica fume, alumina powder and modified mullite fiber; then, uniformly mixing dispersant, anti-explosion fiber and citric acid; and then, uniformly mixing binder and appropriate amount of water.

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