A refractory castable for lining a calcination furnace used in the preparation of lithium battery cathode materials.

Abstract

This invention discloses a refractory castable for a calcining furnace lining used in the preparation of lithium battery cathode materials, belonging to the field of castable preparation technology. The refractory castable is composed of the following components by weight: 21-36 parts refractory aggregate, 5.8-12 parts composite fiber, 27-54 parts refractory fines, 8.2-11.8 parts binder, and 3.5-11 parts additives. The preparation method of the refractory castable includes: S1-1, mixing the raw materials in a mixer; S1-2, placing the mixed powder into a stirrer for stirring and ultrasonic treatment. This invention improves the density of the refractory castable by combining refractory aggregate and refractory fines, reduces the generation of air bubbles, and improves the refractory resistance of the refractory castable. The composite fiber of this invention can effectively improve the thermal shock resistance of the refractory castable, and the binder and additives can effectively improve the corrosion resistance of the refractory.

Description

Technical Field

[0001] This invention relates to the field of castable preparation technology, specifically to a refractory castable for calcining furnace lining used in the preparation of lithium battery cathode materials. Background Technology

[0002] Refractory castable is a special building material typically used for repairing and reinforcing refractory linings, furnace linings, furnace bottoms, and furnace walls in high-temperature environments. It is composed of a mixture of refractory materials and binders, and can be applied by pouring or troweling. It possesses excellent refractory properties and mechanical strength.

[0003] Furnace lining castings for lithium-ion battery cathode materials typically possess the following characteristics: Since lithium-ion battery cathode materials require high-temperature calcination, the furnace lining castings must exhibit high-temperature stability, maintaining good physical and chemical properties at high temperatures. Acidic gases are generated during the calcination process, therefore the furnace lining castings must possess good corrosion resistance to withstand the erosion of these acidic gases. High thermal conductivity is also essential for rapidly transferring heat into the furnace chamber, improving calcination efficiency. Finally, sufficient mechanical strength is required to withstand thermal stress and mechanical impact at high temperatures, preventing cracking or detachment of the furnace lining.

[0004] Existing refractory castables used for calcining furnace linings have poor refractory stability, are prone to cracking, have low corrosion resistance, and their surfaces are easily corroded, leading to the detachment of the inner wall of the furnace lining. They also have low mechanical strength and cannot withstand thermal stress and mechanical impact at high temperatures. Therefore, there is a need for a refractory castable for calcining furnace linings used in the preparation of lithium battery cathode materials. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a refractory castable for lining a calcining furnace used in the preparation of lithium battery cathode materials.

[0006] The technical solution of the present invention is: a refractory castable for a calcining furnace lining used in the preparation of lithium battery cathode materials, wherein the refractory castable is composed of the following components in parts by weight: 21-36 parts of refractory aggregate, 5.8-12 parts of composite fiber, 27-54 parts of refractory fines, 8.2-11.8 parts of binder, and 3.5-11 parts of additives;

[0007] The refractory aggregate is composed of the following components in parts by weight: 5-10 parts alumina microspheres, 7-9 parts silicon carbide particles, 4-6 parts shale ceramsite, 1-3 parts zirconium oxide hollow spheres, and 4-8 parts magnesia.

[0008] The composite fiber is composed of the following components in parts by weight: 3-4 parts heat-resistant steel fiber, 1-3 parts glass fiber, 0.8-2 parts graphite fiber, and 1-3 parts carbon fiber;

[0009] The refractory fines are composed of the following components in parts by weight: 4-8 parts nano zirconium oxide, 7-15 parts silica powder, 1-3 parts yttrium oxide, 4-9 parts calcium aluminate, 8-9 parts high-alumina bauxite clinker, 2-5 parts silica fume, and 1-5 parts calcium titanate.

[0010] The adhesive is composed of the following components in parts by weight: 0.2-0.8 parts hexamethylenetetramine, 1-3 parts sodium polyacrylate, and 7-8 parts calcium silicate;

[0011] The additive consists of the following components in parts by weight: 0.5-2 parts polyvinyl alcohol modified polyurethane, 2-4 parts aluminum oxynitride nanoparticles, and 1-5 parts silane coupling agent.

[0012] Furthermore, the refractory aggregate has a particle size of 0.3-0.5 cm, the refractory fines have a particle size of 100-200 μm, the binder has a particle size of 40-80 μm, and the additives have a particle size of 80-100 μm.

[0013] Note: Refractory fines can effectively fill the gaps in refractory aggregates, preventing air from being incorporated into the refractory castable. At high temperatures, the expansion of air can cause the inner wall of the furnace lining to detach.

[0014] Furthermore, the heat-resistant steel fiber in the composite fiber has a length of 0.5-1cm and a diameter of 0.5-0.8mm, the glass fiber has a length of 1-2cm and a diameter of 0.8-1mm, and the graphite fiber and carbon fiber have a length of 1-1.5cm and a diameter of 1-2mm.

[0015] Note: The lengths of the aforementioned hot steel fibers, glass fibers, graphite fibers, and carbon fibers can effectively enhance the thermal shock resistance of refractory castables, enabling them to better resist thermal stress and thermal shock caused by temperature changes.

[0016] Furthermore, the preparation method of the refractory castable includes the following steps:

[0017] S1-1. Pour the above-mentioned refractory aggregate into the mixer according to the above proportions and perform a first stage of mixing. After the first stage of mixing is completed, put the composite fiber into the mixer according to the above proportions and continue mixing for a second stage of mixing. After the second stage of mixing is completed, add the refractory fines, the binder, and the additives into the mixer according to the above proportions for a third stage of mixing. After the three stages of mixing are completed, a mixed powder is obtained.

[0018] S1-2. Add the mixed powder obtained in step S1 to a mixer, and add water to the mixer at the same time. The ratio of the amount of water to the mass of the mixed powder is 1:2. Ultrasonic treatment is carried out during the mixing process. After the mixing is completed, a refractory castable is obtained.

[0019] Note: The refractory castable prepared by the above method has a high refractory temperature, good thermal shock resistance, and long service life.

[0020] Furthermore, in step S2-, during the first stage of mixing, the mixer speed is 80-100 r / min, the mixing temperature is 80-100℃, and the mixing time is 10-20 min; during the second stage, the mixer speed is 70-80 r / min, the mixing temperature is 50-70℃, and the mixing time is 15-25 min; and during the third stage, the mixer speed is 60-70 r / min, the mixing temperature is 30-50℃, and the mixing time is 25-35 min.

[0021] Note: The above mixing method can effectively mix refractory aggregates, composite fibers, refractory fines, binders, and additives evenly, thereby improving the consistency of the refractory castable texture.

[0022] Furthermore, in steps S1-2, the stirring speed of the mixer is 30-50 r / min, the stirring temperature is 15-30℃, and the stirring time is 40-60 min.

[0023] Note: The above mixing parameters can effectively mix all the ingredients evenly in the mixer.

[0024] Furthermore, the ultrasonic frequency of the ultrasonic treatment in step S1-2 is 25-30Hz.

[0025] Explanation: Ultrasonic waves can cause tiny vibrations in the particles of refractory castables, thereby increasing the friction and adhesion between particles, improving the fluidity and plasticity of the material. Ultrasonic waves can also reduce the distance between particles, thus making the particles more evenly dispersed in the material, preventing particles from agglomerating and forming clumps, improving the uniformity of the material, and making the material more uniform and dense.

[0026] Furthermore, the method of using the refractory castable includes the following steps:

[0027] S2-1: Pour the refractory castable into the furnace lining mold of the calcining furnace. When the castable is poured to half the volume of the mold, the castable in the mold is vibrated. During the vibration process, the castable is continued to be added until the casting is completed. Continue to vibrate for 3-5 minutes. After the vibration is completed, put the mold into the drying chamber. The temperature of the drying chamber is 10-30℃. Dry for 24-36 hours. Remove the mold to obtain the furnace lining blank.

[0028] S2-2: Grind the inner wall of the furnace lining blank obtained in step S2-1 using a hand grinder to remove the surface burrs on the outer wall of the furnace lining. After removal, place the furnace lining in a drying chamber for curing. The curing time is 8-10 days. After curing, the furnace lining of the calcining furnace is obtained.

[0029] Note: The above method is highly efficient and produces good casting results for furnace lining casting.

[0030] Furthermore, in step S2-1, the flow rate of the refractory material poured into the mold is 0.3-0.5 m / s. 3 / min, the oscillation frequency of the oscillation process is 10-20Hz.

[0031] Explanation: Vibration treatment helps to mix the various materials in the castable, making it more uniform. Introducing air into the castable will cause air bubbles to form inside, affecting the quality of the castable. Vibration treatment can remove air by moving the material back and forth, thus preventing the formation of air bubbles.

[0032] Furthermore, in step S2-2, the power of the hand grinder is 1000-1500W, the grinding wheel on the hand grinder is 200-300 mesh, and the roughness Ra of the inner wall of the furnace lining after the hand grinder is completed is 0.3-0.5mm.

[0033] Note: Grinding with a hand grinder improves the inner wall of the furnace lining, which helps to increase the wear resistance of the inner wall of the furnace lining.

[0034] The beneficial effects of this invention are:

[0035] This invention improves the density of refractory castables, reduces the generation of air bubbles, and enhances the refractory resistance of refractory castables by combining refractory aggregates and refractory fines. The composite fibers of this invention can effectively improve the thermal shock resistance of refractory castables, and the binders and additives can effectively improve the corrosion resistance of refractory materials, which helps to extend the service life of refractory castables. The surface of the castable is also more wear-resistant. Detailed Implementation

[0036] Example 1:

[0037] A refractory castable for a calcining furnace lining used in the preparation of lithium battery cathode materials, the refractory castable being composed of the following components by weight: 21 parts refractory aggregate, 5.8 parts composite fiber, 27 parts refractory fines, 8.2 parts binder, and 3.5 parts additives.

[0038] The refractory aggregate is composed of the following components in parts by weight: 5 parts alumina microspheres, 7 parts silicon carbide particles, 4 parts shale ceramsite, 1 part zirconia hollow spheres, and 4 parts magnesia.

[0039] The composite fiber is composed of the following components by weight: 3 parts heat-resistant steel fiber, 1 part glass fiber, 0.8 parts graphite fiber, and 1 part carbon fiber;

[0040] The refractory fines are composed of the following components by weight: 4 parts nano-zirconia, 7 parts silica powder, 1 part yttrium oxide, 4 parts calcium aluminate, 8 parts high-alumina bauxite clinker, 2 parts silica fume, and 1 part calcium titanate.

[0041] The adhesive consists of the following components in parts by weight: 0.2 parts hexamethylenetetramine, 1 part sodium polyacrylate, and 7 parts calcium silicate;

[0042] The additive consists of the following components by weight: 0.5 parts polyvinyl alcohol modified polyurethane, 2 parts aluminum oxynitride nanoparticles, and 1 part silane coupling agent.

[0043] The particle size of the refractory aggregate is 0.3-0.5cm, the particle size of the refractory fines is 100-200μm, the particle size of the binder is 40-80μm, and the particle size of the additives is 80-100μm.

[0044] The composite fiber has a heat-resistant steel fiber length of 0.5cm and a diameter of 0.5mm, a glass fiber length of 1cm and a diameter of 0.8mm, and graphite fiber and carbon fiber length of 1cm and a diameter of 1mm.

[0045] Example 2:

[0046] A refractory castable for lining a calcining furnace used in the preparation of lithium battery cathode materials, the refractory castable is composed of the following components in parts by weight: 26 parts refractory aggregate, 8.5 parts composite fiber, 35.5 parts refractory fines, 10 parts binder, and 6 parts additives.

[0047] The refractory aggregate is composed of the following components in parts by weight: 6 parts alumina microspheres, 8 parts silicon carbide particles, 5 parts shale ceramsite, 2 parts zirconium oxide hollow spheres, and 5 parts magnesia.

[0048] The composite fiber is composed of the following components by weight: 3.5 parts heat-resistant steel fiber, 2 parts glass fiber, 1 part graphite fiber, and 2 parts carbon fiber;

[0049] The refractory fines are composed of the following components by weight: 5 parts nano zirconium oxide, 10 parts silica powder, 2 parts yttrium oxide, 5 parts calcium aluminate, 8.5 parts high-alumina bauxite clinker, 3 parts silica fume, and 2 parts calcium titanate.

[0050] The adhesive consists of the following components in parts by weight: 0.5 parts hexamethylenetetramine, 2 parts sodium polyacrylate, and 7.5 parts calcium silicate;

[0051] The additive consists of the following components in parts by weight: 1 part polyvinyl alcohol modified polyurethane, 3 parts aluminum oxynitride nanoparticles, and 2 parts silane coupling agent.

[0052] The particle size of the refractory aggregate is 0.3-0.5cm, the particle size of the refractory fines is 100-200μm, the particle size of the binder is 40-80μm, and the particle size of the additives is 80-100μm.

[0053] The composite fiber has a length of 0.8cm and a diameter of 0.6mm for the heat-resistant steel fiber, a length of 1.5cm and a diameter of 0.9mm for the glass fiber, and a length of 1.3cm and a diameter of 1.5mm for the graphite fiber and carbon fiber.

[0054] Example 3:

[0055] A refractory castable for lining a calcining furnace used in the preparation of lithium battery cathode materials, the refractory castable is composed of the following components in parts by weight: 36 parts refractory aggregate, 12 parts composite fiber, 54 parts refractory fines, 11.8 parts binder, and 11 parts additives.

[0056] The refractory aggregate is composed of the following components by weight: 10 parts alumina microspheres, 9 parts silicon carbide particles, 6 parts shale ceramsite, 3 parts zirconium oxide hollow spheres, and 8 parts magnesia.

[0057] The composite fiber is composed of the following components by weight: 4 parts heat-resistant steel fiber, 3 parts glass fiber, 2 parts graphite fiber, and 3 parts carbon fiber;

[0058] The refractory fines are composed of the following components by weight: 8 parts nano zirconium oxide, 15 parts silica powder, 3 parts yttrium oxide, 9 parts calcium aluminate, 9 parts high-alumina bauxite clinker, 5 parts silica fume, and 5 parts calcium titanate.

[0059] The adhesive consists of the following components in parts by weight: 0.8 parts hexamethylenetetramine, 3 parts sodium polyacrylate, and 8 parts calcium silicate;

[0060] The additive consists of the following components by weight: 2 parts polyvinyl alcohol modified polyurethane, 4 parts aluminum oxynitride nanoparticles, and 5 parts silane coupling agent.

[0061] The particle size of the refractory aggregate is 0.3-0.5cm, the particle size of the refractory fines is 100-200μm, the particle size of the binder is 40-80μm, and the particle size of the additives is 80-100μm.

[0062] The composite fiber has a heat-resistant steel fiber length of 1cm and a diameter of 0.8mm, a glass fiber length of 2cm and a diameter of 1mm, and a graphite fiber and carbon fiber length of 1.5cm and a diameter of 2mm.

[0063] Comparing Examples 1-3, the refractory castable in Example 3 has better fire resistance, thermal shock resistance, and corrosion resistance. Therefore, Example 3 is the best example.

[0064] Example 4:

[0065] Based on Example 3, this example provides a method for preparing refractory castables, including the following steps:

[0066] S1-1. Pour the above-mentioned refractory aggregate into the mixer according to the above proportions and perform a first stage of mixing. After the first stage of mixing is completed, add the composite fiber into the mixer according to the above proportions and continue mixing for a second stage of mixing. After the second stage of mixing is completed, add the refractory fines, binder, and additives into the mixer according to the above proportions for a third stage of mixing. After the third stage of mixing is completed, a mixed powder is obtained.

[0067] S1-2. Add the mixed powder obtained in step S1 to the mixer, and add water to the mixer at the same time. The ratio of water to mixed powder is 1:2. Ultrasonic treatment is carried out during the mixing process. After the mixing is completed, refractory castable is obtained.

[0068] In step S2, during the first stage of mixing, the mixer speed is 80 r / min, the mixing temperature is 80℃, and the mixing time is 10 min. During the second stage, the mixer speed is 70 r / min, the mixing temperature is 50℃, and the mixing time is 15 min. During the third stage, the mixer speed is 60 r / min, the mixing temperature is 30℃, and the mixing time is 25 min.

[0069] In steps S1-2, the mixing speed of the mixer is 30 r / min, the mixing temperature is 15℃, and the mixing time is 40 min.

[0070] The ultrasonic frequency in step S1-2 is 25Hz.

[0071] Example 5:

[0072] The difference between this embodiment and embodiment 4 is that in step S2-, the mixer speed is 90 r / min, the mixing temperature is 90℃, and the mixing time is 15 min in the first stage of mixing; the mixer speed is 60 r / min, the mixing temperature is 60℃, and the mixing time is 20 min in the second stage; and the mixer speed is 65 r / min, the mixing temperature is 40℃, and the mixing time is 30 min in the third stage.

[0073] In steps S1-2, the mixing speed of the mixer is 40 r / min, the mixing temperature is 25℃, and the mixing time is 50 min.

[0074] The ultrasonic frequency in step S1-2 is 28Hz.

[0075] Example 6:

[0076] The difference between this embodiment and embodiment 4 is that in step S2-, the mixer speed is 100 r / min, the mixing temperature is 100℃, and the mixing time is 20 min in the first stage of mixing; the mixer speed is 80 r / min, the mixing temperature is 70℃, and the mixing time is 25 min in the second stage; and the mixer speed is 70 r / min, the mixing temperature is 50℃, and the mixing time is 35 min in the third stage.

[0077] In steps S1-2, the mixing speed of the mixer is 50 r / min, the mixing temperature is 30℃, and the mixing time is 60 min.

[0078] The ultrasonic frequency in step S1-2 is 30Hz.

[0079] Comparing Examples 4-6, Example 6 showed the best preparation effect, therefore Example 6 is the best example.

[0080] Example 7:

[0081] Based on Example 6, this example provides a method for using refractory castable, including the following steps:

[0082] S2-1: Pour the refractory castable into the furnace lining mold of the calcining furnace. When the castable is poured to half the volume of the mold, the castable in the mold is vibrated. During the vibration process, the castable is continued to be added until the casting is completed. Continue to vibrate for 3 minutes. After the vibration is completed, put the mold into the drying room. The temperature of the drying room is 10℃. Dry for 24 hours. Remove the mold to obtain the furnace lining blank.

[0083] S2-2: Grind the inner wall of the furnace lining blank obtained in step S2-1 using a hand grinder to remove the surface burrs on the outer wall of the furnace lining. After removal, place the furnace lining in a drying chamber for curing for 8 days. After curing, the furnace lining of the calcining furnace is obtained.

[0084] In step S2-1, the flow rate of the refractory material poured into the mold is 0.3 m / s. 3 / min, the oscillation frequency of the oscillation process is 10Hz.

[0085] In step S2-2, the power of the hand grinder is 1000W, the grinding wheel on the hand grinder is 200 mesh, and the roughness Ra of the inner wall of the furnace lining after the hand grinder is completed is 0.3mm.

[0086] Example 8:

[0087] Based on Example 6, this example provides a method for using refractory castable, including the following steps:

[0088] S2-1: Pour the refractory castable into the furnace lining mold of the calcining furnace. When the castable is poured to half the volume of the mold, the castable in the mold is vibrated. During the vibration process, the castable is continued to be added until the casting is completed. Continue to vibrate for 4 minutes. After the vibration is completed, put the mold into the drying chamber at a temperature of 20°C and dry for 30 hours. Remove the mold to obtain the furnace lining blank.

[0089] S2-2: Grind the inner wall of the furnace lining blank obtained in step S2-1 using a hand grinder to remove the surface burrs on the outer wall of the furnace lining. After removal, place the furnace lining in a drying chamber for curing for 9 days. After curing, the furnace lining of the calcining furnace is obtained.

[0090] In step S2-1, the flow rate of the refractory material poured into the mold is 0.4 m / s. 3 / min, the oscillation frequency of the oscillation process is 15Hz.

[0091] In step S2-2, the power of the hand grinder is 1300W, the grinding wheel on the hand grinder is 250 mesh, and the roughness Ra of the inner wall of the furnace lining after the hand grinder is completed is 0.4mm.

[0092] Example 9:

[0093] Based on Example 6, this example provides a method for using refractory castable, including the following steps:

[0094] S2-1: Pour the refractory castable into the furnace lining mold of the calcining furnace. When the castable is poured to half the volume of the mold, the castable in the mold is vibrated. During the vibration process, the castable is continued to be added until the casting is completed. Continue to vibrate for 5 minutes. After the vibration is completed, put the mold into the drying room. The temperature of the drying room is 30℃. Dry for 36 hours. Remove the mold to obtain the furnace lining blank.

[0095] S2-2: Grind the inner wall of the furnace lining blank obtained in step S2-1 using a hand grinder to remove the surface burrs on the outer wall of the furnace lining. After removal, place the furnace lining in a drying chamber for curing. The curing time is 8-10 days. After curing, the furnace lining of the calcining furnace is obtained.

[0096] In step S2-1, the flow rate of the refractory material poured into the mold is 0.5 m / s. 3 / min, the oscillation frequency of the oscillation process is 20Hz.

[0097] In step S2-2, the power of the hand grinder is 1500W, the grinding wheel on the hand grinder is 300 mesh, and the roughness Ra of the inner wall of the furnace lining after the hand grinder is completed is 0.5mm.

[0098] Comparing Examples 7-9, Example 9 showed the best casting effect, therefore Example 9 is the best example.

Claims

1. A refractory castable for a calcination furnace lining used in the preparation of lithium battery cathode materials, characterized in that, The refractory castable is composed of the following components in parts by weight: 21-36 parts refractory aggregate, 5.8-12 parts composite fiber, 27-54 parts refractory fines, 8.2-11.8 parts binder, and 3.5-11 parts additives. The refractory aggregate is composed of the following components in parts by weight: 5-10 parts alumina microspheres, 7-9 parts silicon carbide particles, 4-6 parts shale ceramsite, 1-3 parts zirconium oxide hollow spheres, and 4-8 parts magnesia. The composite fiber is composed of the following components in parts by weight: 3-4 parts heat-resistant steel fiber, 1-3 parts glass fiber, 0.8-2 parts graphite fiber, and 1-3 parts carbon fiber; The refractory fines are composed of the following components in parts by weight: 4-8 parts nano-zirconia, 7-15 parts silica powder, 1-3 parts yttrium oxide, 4-9 parts calcium aluminate, 8-9 parts high-alumina bauxite clinker, 2-5 parts silica fume, and 1-5 parts calcium titanate. The adhesive is composed of the following components in parts by weight: 0.2-0.8 parts hexamethylenetetramine, 1-3 parts sodium polyacrylate, and 7-8 parts calcium silicate; The additive consists of the following components in parts by weight: 0.5-2 parts polyvinyl alcohol modified polyurethane, 2-4 parts aluminum oxynitride nanoparticles, and 1-5 parts silane coupling agent. The refractory aggregate has a particle size of 0.3-0.5 cm, the refractory fines have a particle size of 100-200 μm, the binder has a particle size of 40-80 μm, and the additives have a particle size of 80-100 μm. The composite fiber has a heat-resistant steel fiber with a length of 0.5-1cm and a diameter of 0.5-0.8mm, a glass fiber with a length of 1-2cm and a diameter of 0.8-1mm, and a graphite fiber and carbon fiber with a length of 1-1.5cm and a diameter of 1-2mm. The refractory castable is prepared by a method comprising the following steps: S1-1. Pour the above-mentioned refractory aggregate into the mixer according to the above proportions and perform a first stage of mixing. After the first stage of mixing is completed, put the composite fiber into the mixer according to the above proportions and continue mixing for a second stage of mixing. After the second stage of mixing is completed, add the refractory fines, the binder, and the additives into the mixer according to the above proportions for a third stage of mixing. After the three stages of mixing are completed, a mixed powder is obtained. S1-2. Add the mixed powder obtained in step S1 to a mixer, and add water to the mixer at the same time. The ratio of the amount of water to the mass of the mixed powder is 1:

2. Ultrasonic treatment is carried out during the mixing process. After the mixing is completed, a refractory castable is obtained. In step S1-1, during the first stage of mixing, the mixer speed is 80-100 r / min, the mixing temperature is 80-100℃, and the mixing time is 10-20 min. During the second stage of mixing, the mixer speed is 70-80 r / min, the mixing temperature is 50-70℃, and the mixing time is 15-25 min. During the third stage of mixing, the mixer speed is 60-70 r / min, the mixing temperature is 30-50℃, and the mixing time is 25-35 min.

2. The refractory castable for the furnace lining of a calcination furnace for preparing lithium battery cathode materials as described in claim 1, characterized in that, In steps S1-2, the mixing speed of the mixer is 30-50 r / min, the mixing temperature is 15-30℃, and the mixing time is 40-60 min.

3. The refractory castable for the furnace lining of a calcination furnace for preparing lithium battery cathode materials as described in claim 1, characterized in that, The ultrasonic frequency in the ultrasonic treatment in step S1-2 is 25-30Hz.

4. The refractory castable for a calcination furnace lining used in preparing lithium battery cathode materials as described in claim 1, characterized in that, The method of using the refractory castable includes the following steps: S2-1: Pour the refractory castable into the furnace lining mold of the calcining furnace. When the castable is poured to half the volume of the mold, the castable in the mold is vibrated. During the vibration process, the castable is continued to be added until the casting is completed. Continue to vibrate for 3-5 minutes. After the vibration process is completed, put the mold into the drying chamber. The temperature of the drying chamber is 10-30℃. Dry for 24-36 hours. Remove the mold to obtain the furnace lining blank. S2-2: Grind the inner wall of the furnace lining blank obtained in step S2-1 using a hand grinder to remove the surface burrs on the outer wall of the furnace lining. After removal, place the furnace lining in a drying chamber for curing. The curing time is 8-10 days. After curing, the furnace lining of the calcining furnace is obtained.

5. The refractory castable for a calcination furnace lining used in preparing lithium battery cathode materials as described in claim 4, characterized in that, In step S2-1, the flow rate of the refractory material poured into the mold is 0.3-0.5 m / s. 3 / min, the oscillation frequency of the oscillation process is 10-20Hz.