Refractory material for producing lithium battery negative electrode material

Abstract

The application discloses a kind of refractory materials for producing lithium battery negative electrode material ring calcination furnace, refractory material includes 90~150 parts by weight aluminium oxide, 30~50 parts by weight calcium oxide, 25~35 parts by weight silicon dioxide, 20~30 parts by weight electric melting white corundum powder, 5~10 parts by weight calcium hexaluminate, 4~6 parts by weight iron oxide, 3~6 parts by weight titanium oxide, 2~5 parts by weight aluminium silicate, 10~15 parts by weight binder;Aluminium oxide is powdered raw material, which contains 30%~50% of 20μm~40μm particle size aluminium oxide powder, 40%~60% of 40μm~60μm particle size aluminium oxide powder, and the rest is 60μm~100μm particle size aluminium oxide powder;The refractory material has better high-temperature resistance, can withstand high-temperature environment while ensuring its performance does not change;Refractory material has better corrosion resistance, can withstand erosion of materials in the furnace, while resisting chemical reactions, oxidation and reduction, etc.

Description

Technical Field

[0001] This invention relates to the field of refractory materials technology, specifically to a refractory material for a ring-type calcining furnace used in the production of lithium battery anode materials. Background Technology

[0002] Annular calcining furnaces are high-temperature heat treatment equipment that must withstand extreme conditions such as high temperatures, chemical corrosion, and mechanical stress. To ensure the furnace body's high-temperature consolidation and long service life, high-temperature refractory materials are required, with refractory bricks being a commonly used material. For annular calcining furnaces producing lithium battery anode materials, the refractory bricks used must possess excellent thermal shock resistance, corrosion resistance, and wear resistance. The lining materials selected for alkaline annular calcining furnaces need to have good erosion resistance, thermal stability, wear resistance, and mechanical strength. Currently used refractory materials still lack in thermal shock resistance, corrosion resistance, and wear resistance, and their performance needs further improvement to ensure the efficient, stable, and long-term operation of annular calcining furnaces. Summary of the Invention

[0003] The purpose of this invention is to provide a refractory material for an annular calcining furnace used in the production of lithium battery anode materials, which has better thermal shock resistance, corrosion resistance and wear resistance.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A refractory material for an annular calcining furnace used in the production of lithium battery anode materials, comprising, by weight, 90-150 parts alumina, 30-50 parts calcium oxide, 25-35 parts silicon dioxide, 20-30 parts fused white corundum powder, 5-10 parts calcium hexaaluminate, 4-6 parts iron oxide, 3-6 parts titanium oxide, 2-5 parts aluminum silicate, and 10-15 parts binder.

[0006] Alumina is a powdered raw material, which contains 30% to 50% alumina powder with a particle size of 20 μm to 40 μm, 40% to 60% alumina powder with a particle size of 40 μm to 60 μm, and the remainder is alumina powder with a particle size of 60 μm to 100 μm.

[0007] Calcium oxide is a powdered raw material with a particle size of 0.5–2 mm;

[0008] Silica is a powdered raw material with a particle size of 0.2–1 mm;

[0009] Fused white corundum powder is a powdered raw material with a particle size of 50μm to 100μm;

[0010] Calcium hexaaluminate is a powdered raw material with a particle size of 0.5–1.5 mm;

[0011] Iron oxide is a powdered raw material with a particle size of 30μm to 50μm;

[0012] Titanium oxide is a powdered raw material with a particle size of 30μm to 50μm;

[0013] Aluminum silicate is a powdered raw material with a particle size of 100μm to 200μm.

[0014] Preferably, the adhesive comprises, by weight, 4-5 parts alkyd resin, 2-3 parts phenolic resin, 0.5-1 part hexamethylenetetramine, 2-3 parts magnesium oxide powder, 0.5-1 part glass fiber, and 1-2 parts water.

[0015] Preferably, the refractory material further includes 15-25 parts of thermal shock resistant additives, 10-20 parts of high temperature resistant additives, 10-15 parts of corrosion resistant additives, and 8-12 parts of wear resistant additives;

[0016] The thermal shock resistant additives, by weight, include 5 to 8 parts of zirconium oxide fiber with a particle size of 50 μm to 80 μm, 4 to 6 parts of andalusite powder with a particle size of 100 μm to 200 μm, 3 to 6 parts of sillimanite powder with a particle size of 100 μm to 200 μm, and 3 to 5 parts of high-temperature asphalt particles with a particle size of 0.1 to 0.5 mm.

[0017] Preferably, the high-temperature auxiliary additives, by weight, include 4 to 8 parts of magnesia with a particle size of 80 μm to 120 μm, 3 to 6 parts of tungsten carbide powder with a particle size of 40 μm to 60 μm, 2 to 3 parts of titanium metal powder with a particle size of 30 μm to 50 μm, and 1 to 3 parts of cobalt metal powder with a particle size of 30 μm to 50 μm.

[0018] Preferably, the corrosion-resistant auxiliary additives, by weight, include 5 to 7 parts of fused silica powder with a particle size of 200 μm to 300 μm, 3 to 5 parts of carbon fiber with a particle size of 50 μm to 80 μm, and 2 to 3 parts of boron nitride powder with a particle size of 50 μm to 80 μm.

[0019] Preferably, the wear-resistant auxiliary additives, by weight, include 4 to 6 parts of silicon carbide ceramic powder with a particle size of 30 μm to 60 μm, 3 to 4 parts of chromium oxide powder with a particle size of 20 μm to 30 μm, and 1 to 2 parts of yttrium oxide powder with a particle size of 20 μm to 30 μm.

[0020] Note: Adding thermal shock resistant additives, high temperature resistant additives, corrosion resistant additives, and wear resistant additives helps refractory materials achieve higher high temperature resistance, better thermal shock resistance, superior corrosion resistance, and better wear resistance, thus significantly improving the overall performance of refractory materials.

[0021] Preferably, based on the above-mentioned refractory material for an annular calcining furnace used in the production of lithium battery anode materials, the process for preparing refractory bricks using this refractory material includes the following steps:

[0022] S1, Mixed raw materials:

[0023] Weigh out the refractory materials according to the proportions, and mix them thoroughly in a mixer to obtain the mixed raw materials;

[0024] S2. Pressing brick blanks:

[0025] The mixed raw materials are pressed into standard-shaped refractory brick blanks using a brick press machine;

[0026] S3. Brick drying:

[0027] The die-cast refractory brick blanks are dried in a natural environment for 36 to 48 hours;

[0028] S4. Brick firing:

[0029] Refractory brick blanks are placed in a kiln and fired at a temperature of 1780℃~1830℃ to obtain refractory bricks.

[0030] S5, Voltage Regulation:

[0031] To perform pressure regulation on refractory bricks, place them in a pressure vessel and pressurize them to 15 MPa at a rate of 0.1 MPa / min, hold the pressure for 10–20 minutes, then rapidly depressurize them to 10 MPa within 2 seconds, wait for 5–10 seconds, then rapidly pressurize them to 14 MPa within 5 seconds, hold the pressure for 10–20 minutes, and finally depressurize them to atmospheric pressure at a rate of 0.2 MPa / min.

[0032] Preferably, in step S2, the mixed raw materials are die-cast into refractory brick blanks using a 500t friction brick press, with the bulk density of the blanks controlled to be 2.90–3.05 g / cm³. 3 .

[0033] Note: Appropriate brick density ensures that the refractory brick has sufficient mechanical strength and also achieves a balance between porosity, expansion rate and thermal conductivity, resulting in better overall performance of the refractory brick.

[0034] Preferably, in step S3, the specific drying process is as follows: the refractory brick blanks are first naturally air-dried in an environment with an ambient temperature of 20-35℃ for 36-48 hours, and then the refractory brick blanks are placed in a drying oven and dried at 85℃-115℃ for 60-100 minutes.

[0035] Note: This drying process allows the refractory brick blanks to dry more evenly, and leaves a trace amount of moisture, which is beneficial for maintaining the strength of the refractory bricks.

[0036] Preferably, in step S4, the specific firing process is as follows: the refractory brick blank is placed in a kiln for firing, held at 850℃~900℃ for 90~150min, heated to 1450℃~1550℃ for 120~180min, and finally fired at 1780℃~1830℃ for 9~11 hours to obtain the refractory brick.

[0037] Note: This firing process allows the components in the refractory brick blank to fuse more fully and evenly, resulting in better mechanical strength in the finished refractory brick.

[0038] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects:

[0039] 1. The refractory material of the present invention has better high temperature resistance, and its heat resistance temperature is further increased by 3% to 5% compared with the existing high alumina refractory materials. It can withstand high temperature environment while ensuring that its own performance does not change.

[0040] 2. The refractory material of the present invention has better erosion resistance, can withstand the erosion of materials in the furnace, and resists chemical reactions, oxidation and reduction, etc., and has a longer actual service life.

[0041] 3. The refractory material of the present invention has better thermal shock stability, can cope with rapidly changing high and low temperature environments, can withstand complex mechanical stress in high temperature environments, and can not fail during long-term use.

[0042] 4. The refractory material of the present invention has better mechanical strength and better stress resistance, and can ensure that it will not crack under long-term thermal expansion and heating and cooling conditions.

[0043] The refractory bricks prepared from the refractory materials of this invention have a service life that is 5% to 8% longer than that prepared from high-alumina refractory materials in the prior art. Attached Figure Description

[0044] Figure 1 This is the front view of the present invention. Detailed Implementation

[0045] The following is combined with Figure 1 The present invention will be described in detail. For ease of description, the orientations mentioned below are defined as follows: The directions of up, down, left, right, front, and back mentioned below are consistent with the directions of up, down, left, right, front, and back in the projection relationship of the respective main view or structural schematic diagram.

[0046] Example 1:

[0047] A refractory material for an annular calcining furnace used in the production of lithium battery anode materials, comprising, by weight, 150 parts alumina, 50 parts calcium oxide, 35 parts silicon dioxide, 30 parts fused white corundum powder, 10 parts calcium hexaaluminate, 6 parts iron oxide, 6 parts titanium oxide, 5 parts aluminum silicate, 15 parts binder, 25 parts thermal shock resistant additives, 20 parts high temperature resistant additives, 15 parts corrosion resistant additives, and 12 parts wear resistant additives.

[0048] The adhesive, by weight, comprises 5 parts alkyd resin, 3 parts phenolic resin, 1 part hexamethylenetetramine, 3 parts magnesium oxide powder, 1 part glass fiber, and 2 parts water.

[0049] The thermal shock resistant additives, by weight, include 8 parts of zirconium oxide fiber with a particle size of 70μm to 80μm, 6 parts of andalusite powder with a particle size of 180μm to 200μm, 6 parts of sillimanite powder with a particle size of 180μm to 200μm, and 5 parts of high-temperature asphalt particles with a particle size of 0.4 to 0.5mm.

[0050] The high-temperature auxiliary additives, by weight, include 8 parts of magnesia with a particle size of 110μm to 120μm, 6 parts of tungsten carbide powder with a particle size of 55μm to 60μm, 3 parts of titanium metal powder with a particle size of 45μm to 50μm, and 3 parts of cobalt metal powder with a particle size of 45μm to 50μm.

[0051] The corrosion-resistant auxiliary additives, by weight, include 7 parts of fused silica powder with a particle size of 280μm to 300μm, 5 parts of carbon fiber with a particle size of 70μm to 80μm, and 3 parts of boron nitride powder with a particle size of 70μm to 80μm.

[0052] The wear-resistant auxiliary additives, by weight, include 6 parts of silicon carbide ceramic powder with a particle size of 55μm to 60μm, 4 parts of chromium oxide powder with a particle size of 20μm to 30μm, and 2 parts of yttrium oxide powder with a particle size of 20μm to 30μm.

[0053] Alumina is a powdered raw material, which contains 50% alumina powder with a particle size of 20μm to 40μm, 40% alumina powder with a particle size of 40μm to 60μm, and the remainder alumina powder with a particle size of 60μm to 100μm.

[0054] Calcium oxide is a powdered raw material with a particle size of 1.8–2 mm;

[0055] Silica is a powdered raw material with a particle size of 0.8–1 mm;

[0056] Fused white corundum powder is a powdered raw material with a particle size of 90μm to 100μm;

[0057] Calcium hexaaluminate is a powdered raw material with a particle size of 1.3–1.5 mm;

[0058] Iron oxide is a powdered raw material with a particle size of 40μm to 50μm;

[0059] Titanium oxide is a powdered raw material with a particle size of 40μm to 50μm;

[0060] Aluminum silicate is a powdered raw material with a particle size of 180μm to 200μm.

[0061] Example 2:

[0062] A refractory material for an annular calcining furnace used in the production of lithium battery anode materials, comprising, by weight, 90 parts alumina, 30 parts calcium oxide, 25 parts silicon dioxide, 20 parts fused white corundum powder, 5 parts calcium hexaaluminate, 4 parts iron oxide, 3 parts titanium oxide, 2 parts aluminum silicate, 10 parts binder, 15 parts thermal shock resistant additives, 10 parts high temperature resistant additives, 10 parts corrosion resistant additives, and 8 parts wear resistant additives.

[0063] The adhesive, by weight, comprises 4 parts alkyd resin, 2 parts phenolic resin, 0.5 parts hexamethylenetetramine, 2 parts magnesium oxide powder, 0.5 parts glass fiber, and 1 part water.

[0064] The thermal shock resistant additives, by weight, include 5 parts of zirconium oxide fiber with a particle size of 50μm to 60μm, 4 parts of andalusite powder with a particle size of 100μm to 120μm, 3 parts of sillimanite powder with a particle size of 100μm to 120μm, and 3 parts of high-temperature asphalt particles with a particle size of 0.1 to 0.2mm.

[0065] The high-temperature auxiliary additives, by weight, include 4 parts of magnesia with a particle size of 80μm to 90μm, 3 parts of tungsten carbide powder with a particle size of 40μm to 45μm, 2 parts of titanium metal powder with a particle size of 30μm to 35μm, and 1 to 3 parts of cobalt metal powder with a particle size of 30μm to 35μm.

[0066] The corrosion-resistant auxiliary additives, by weight, include 5 parts of fused silica powder with a particle size of 200μm to 220μm, 3 parts of carbon fiber with a particle size of 50μm to 60μm, and 2 parts of boron nitride powder with a particle size of 50μm to 60μm.

[0067] The wear-resistant auxiliary additives, by weight, include 4 parts of silicon carbide ceramic powder with a particle size of 30μm to 40μm, 3 parts of chromium oxide powder with a particle size of 20μm to 30μm, and 1 part of yttrium oxide powder with a particle size of 20μm to 30μm.

[0068] Alumina is a powdered raw material, which contains 30% alumina powder with a particle size of 20μm to 40μm, 40% alumina powder with a particle size of 40μm to 60μm, and the remainder alumina powder with a particle size of 60μm to 100μm.

[0069] Calcium oxide is a powdered raw material with a particle size of 0.5–0.7 mm;

[0070] Silica is a powdered raw material with a particle size of 0.2–0.4 mm;

[0071] Fused white corundum powder is a powdered raw material with a particle size of 50μm to 60μm;

[0072] Calcium hexaaluminate is a powdered raw material with a particle size of 0.5–0.8 mm;

[0073] Iron oxide is a powdered raw material with a particle size of 30μm to 40μm;

[0074] Titanium oxide is a powdered raw material with a particle size of 30μm to 40μm;

[0075] Aluminum silicate is a powdered raw material with a particle size of 100μm to 120μm.

[0076] Example 3:

[0077] A refractory material for an annular calcining furnace used in the production of lithium battery anode materials, comprising, by weight, 120 parts alumina, 40 parts calcium oxide, 30 parts silicon dioxide, 25 parts fused white corundum powder, 7.5 parts calcium hexaaluminate, 5 parts iron oxide, 4.5 parts titanium oxide, 3.5 parts aluminum silicate, 13.5 parts binder, 20 parts thermal shock resistant additives, 15 parts high temperature resistant additives, 13.5 parts corrosion resistant additives, and 10 parts wear resistant additives.

[0078] The adhesive, by weight, comprises 4.5 parts alkyd resin, 3 parts phenolic resin, 0.7 parts hexamethylenetetramine, 2.5 parts magnesium oxide powder, 0.8 parts glass fiber, and 2 parts water.

[0079] The thermal shock resistant additives, by weight, include 7.5 parts of zirconium oxide fiber with a particle size of 60μm to 70μm, 5 parts of andalusite powder with a particle size of 140μm to 160μm, 4.5 parts of sillimanite powder with a particle size of 140μm to 160μm, and 4 parts of high-temperature asphalt particles with a particle size of 0.2 to 0.4mm.

[0080] The high-temperature auxiliary additives, by weight, include 6 parts of magnesia with a particle size of 90μm to 110μm, 4.5 parts of tungsten carbide powder with a particle size of 45μm to 55μm, 2.5 parts of titanium metal powder with a particle size of 35μm to 45μm, and 2 parts of cobalt metal powder with a particle size of 35μm to 45μm.

[0081] The corrosion-resistant auxiliary additives, by weight, include 6 parts of fused silica powder with a particle size of 240μm to 260μm, 4 parts of carbon fiber with a particle size of 60μm to 70μm, and 2.5 parts of boron nitride powder with a particle size of 60μm to 70μm.

[0082] The wear-resistant auxiliary additives, by weight, include 5 parts of silicon carbide ceramic powder with a particle size of 40μm to 50μm, 3.5 parts of chromium oxide powder with a particle size of 20μm to 30μm, and 1.5 parts of yttrium oxide powder with a particle size of 20μm to 30μm.

[0083] Alumina is a powdered raw material, which contains 40% alumina powder with a particle size of 20μm to 40μm, 50% alumina powder with a particle size of 40μm to 60μm, and the remainder alumina powder with a particle size of 60μm to 100μm.

[0084] Calcium oxide is a powdered raw material with a particle size of 1.2–1.4 mm;

[0085] Silica is a powdered raw material with a particle size of 0.5–0.6 mm;

[0086] Fused white corundum powder is a powdered raw material with a particle size of 70μm to 80μm;

[0087] Calcium hexaaluminate is a powdered raw material with a particle size of 0.9–1.1 mm;

[0088] Iron oxide is a powdered raw material with a particle size of 35μm to 45μm;

[0089] Titanium oxide is a powdered raw material with a particle size of 35μm to 45μm;

[0090] Aluminum silicate is a powdered raw material with a particle size of 140μm to 160μm.

[0091] Example 4:

[0092] Based on the refractory material for an annular calcining furnace used in the production of lithium battery anode materials according to Embodiment 3 above, the process for preparing refractory bricks using this refractory material includes the following steps:

[0093] S1, Mixed raw materials:

[0094] Weigh out the refractory materials according to the proportions, and mix them thoroughly in a mixer to obtain the mixed raw materials;

[0095] S2. Pressing brick blanks:

[0096] The mixed raw materials are pressed into standard-shaped refractory brick blanks using a brick press. These blanks are then die-cast on a 500t friction brick press to produce refractory brick blanks with a bulk density controlled at 3.05 g / cm³. 3 .

[0097] S3. Brick drying:

[0098] The die-cast refractory brick blanks were dried in a natural environment for 48 hours.

[0099] The specific drying process is as follows: the refractory brick blanks are first naturally air-dried at an ambient temperature of 35℃ for 48 hours, and then placed in a drying oven and dried at 115℃ for 100 minutes.

[0100] S4. Brick firing:

[0101] Refractory brick blanks are placed in a kiln and fired at 1830℃ to form refractory bricks.

[0102] The specific firing process is as follows: the refractory brick blank is placed in the kiln for firing, held at 900℃ for 150 minutes, heated to 1550℃ for 180 minutes, and finally fired at 1830℃ for 11 hours to obtain the refractory brick.

[0103] Example 5:

[0104] The difference from Example 4 is that, in step S2, the bulk density of the brick blank is controlled to be 2.90 g / cm³. 3 ;

[0105] In step S3, the specific drying process is as follows: the refractory brick blanks are first naturally air-dried at an ambient temperature of 20°C for 36 hours, and then the refractory brick blanks are placed in a drying oven and dried at 85°C for 60 minutes.

[0106] In step S4, the specific firing process is as follows: the refractory brick blank is placed in the kiln for firing, held at 850℃ for 90 minutes, heated to 1450℃ for 120 minutes, and finally fired at 1780℃ for 9 hours to obtain the refractory brick.

[0107] Example 6:

[0108] The difference from Example 4 is that in step S2, the bulk density of the brick blank is controlled to be 3 g / cm³. 3 ;

[0109] In step S3, the specific drying process is as follows: the refractory brick blanks are first naturally air-dried at an ambient temperature of 30°C for 42 hours, and then the refractory brick blanks are placed in a drying oven and dried at 110°C for 90 minutes.

[0110] In step S4, the specific firing process is as follows: the refractory brick blank is placed in the kiln for firing, held at 870℃ for 120 minutes, heated to 1530℃ for 150 minutes, and finally fired at 1810℃ for 10 hours to obtain the refractory brick.

[0111] Example 7:

[0112] The process for preparing refractory bricks based on the refractory material of the above embodiment 6 further includes step S5;

[0113] S5, Voltage Regulation:

[0114] To perform pressure regulation on refractory bricks, place them in a pressure vessel, increase the pressure to 15 MPa at a rate of 0.1 MPa / min, hold the pressure for 20 minutes, then rapidly decrease the pressure to 10 MPa within 2 seconds, wait for 10 seconds, then rapidly increase the pressure to 14 MPa within 5 seconds, hold the pressure for 20 minutes, and finally decrease the pressure to atmospheric pressure at a rate of 0.2 MPa / min.

[0115] Example 8:

[0116] The difference from Example 6 is that, in S5, pressure regulation treatment: the refractory bricks are subjected to pressure regulation treatment. The refractory bricks are placed in a pressure vessel, and the pressure is increased to 15 MPa at a rate of 0.1 MPa / min, held for 10 min, then rapidly reduced to 10 MPa within 2 seconds, waited for 5 seconds, and then rapidly increased to 14 MPa within 5 seconds, held for 10 min, and finally reduced to atmospheric pressure at a rate of 0.2 MPa / min.

[0117] Example 9:

[0118] The difference from Example 6 is that, in S5, pressure regulation treatment: the refractory bricks are subjected to pressure regulation treatment. The refractory bricks are placed in a pressure vessel, and the pressure is increased to 15 MPa at a rate of 0.1 MPa / min, held for 15 min, then rapidly reduced to 10 MPa within 2 seconds, waited for 8 seconds, and then rapidly increased to 14 MPa within 5 seconds, held for 15 min, and finally reduced to atmospheric pressure at a rate of 0.2 MPa / min.

Claims

1. A refractory material for a ring-shaped calcining furnace used in the production of lithium battery anode materials, characterized in that, The refractory material, by weight, comprises 90-150 parts alumina, 30-50 parts calcium oxide, 25-35 parts silicon dioxide, 20-30 parts fused white corundum powder, 5-10 parts calcium hexaaluminate, 4-6 parts iron oxide, 3-6 parts titanium oxide, 2-5 parts aluminum silicate, and 10-15 parts binder. The alumina is a powdered raw material, which contains 30% to 50% alumina powder with a particle size of 20 μm to 40 μm, 40% to 60% alumina powder with a particle size of 40 μm to 60 μm, and the remainder is alumina powder with a particle size of 60 μm to 100 μm. The calcium oxide is a powdered raw material with a particle size of 0.5–2 mm; The silica is a powdered raw material with a particle size of 0.2–1 mm; The fused white corundum powder is a powdered raw material with a particle size of 50μm to 100μm. The calcium hexaaluminate is a powdered raw material with a particle size of 0.5–1.5 μm; The iron oxide is a powdered raw material with a particle size of 30μm to 50μm; The titanium dioxide is a powdered raw material with a particle size of 30μm to 50μm; The aluminum silicate is a powdered raw material with a particle size of 100μm to 200μm; The refractory material also includes 15-25 parts of thermal shock resistant additives, 10-20 parts of high temperature resistant additives, 10-15 parts of corrosion resistant additives, and 8-12 parts of wear resistant additives; The thermal shock resistant additive comprises, by weight, 5-8 parts of zirconium oxide fiber with a particle size of 50μm-80μm, 4-6 parts of andalusite powder with a particle size of 100μm-200μm, 3-6 parts of sillimanite powder with a particle size of 100μm-200μm, and 3-5 parts of high-temperature asphalt particles with a particle size of 0.1-0.5mm.

2. The refractory material for a ring-shaped calcining furnace used in the production of lithium battery anode materials according to claim 1, characterized in that, The adhesive, by weight, comprises 4-5 parts alkyd resin, 2-3 parts phenolic resin, 0.5-1 part hexamethylenetetramine, 2-3 parts magnesium oxide powder, 0.5-1 part glass fiber, and 1-2 parts water.

3. The refractory material for a ring-shaped calcining furnace used in the production of lithium battery anode materials according to claim 1, characterized in that, The high-temperature auxiliary additives, by weight, include 4 to 8 parts of magnesia with a particle size of 80 μm to 120 μm, 3 to 6 parts of tungsten carbide powder with a particle size of 40 μm to 60 μm, 2 to 3 parts of titanium metal powder with a particle size of 30 μm to 50 μm, and 1 to 3 parts of cobalt metal powder with a particle size of 30 μm to 50 μm.

4. The refractory material for a ring-shaped calcining furnace used in the production of lithium battery anode materials according to claim 1, characterized in that, The corrosion-resistant auxiliary additives, by weight, include 5 to 7 parts of fused silica powder with a particle size of 200 μm to 300 μm, 3 to 5 parts of carbon fiber with a particle size of 50 μm to 80 μm, and 2 to 3 parts of boron nitride powder with a particle size of 50 μm to 80 μm.

5. The refractory material for a ring-shaped calcining furnace used in the production of lithium battery anode materials according to claim 1, characterized in that, The wear-resistant auxiliary additives, by weight, include 4 to 6 parts of silicon carbide ceramic powder with a particle size of 30 μm to 60 μm, 3 to 4 parts of chromium oxide powder with a particle size of 20 μm to 30 μm, and 1 to 2 parts of yttrium oxide powder with a particle size of 20 μm to 30 μm.

6. A process for preparing refractory bricks using a ring-shaped calcining furnace for producing lithium battery anode materials, based on any one of claims 1 to 5. Its features Includes the following steps: S1, Mixed raw materials: Weigh out the refractory materials according to the proportions, and mix them thoroughly in a mixer to obtain the mixed raw materials; S2. Pressing brick blanks: The mixed raw materials are pressed into standard-shaped refractory brick blanks using a brick press machine; S3. Brick drying: The die-cast refractory brick blanks are dried in a natural environment for 36 to 48 hours; S4. Brick firing: Refractory brick blanks are placed in a kiln and fired at a temperature of 1780℃~1830℃ to obtain refractory bricks.

7. The refractory material for a ring-shaped calcining furnace used in the production of lithium battery anode materials according to claim 6, characterized in that, In step S2, the mixed raw materials are die-cast into refractory brick blanks using a 500t friction brick press, with the bulk density of the blanks controlled at 2.90–3.05 g / cm³. 3 .

8. The refractory material for a ring-shaped calcining furnace used in the production of lithium battery anode materials according to claim 6, characterized in that, In step S3, the specific drying process is as follows: the refractory brick blanks are first naturally air-dried in an environment with an ambient temperature of 20-35℃ for 36-48 hours, and then the refractory brick blanks are placed in a drying oven and dried at 85℃-115℃ for 60-100 minutes.

9. A refractory material for a ring-shaped calcining furnace used in the production of lithium battery anode materials according to claim 6, characterized in that, In step S4, the specific firing process is as follows: the refractory brick blank is placed in a kiln for firing, held at 850℃~900℃ for 90~150 minutes, heated to 1450℃~1550℃ for 120~180 minutes, and finally fired at 1780℃~1830℃ for 9~11 hours to obtain the refractory brick.

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