A lithium mica particle thermal insulation brick and its preparation method

Abstract

This invention discloses a lithium mica granule insulating brick and its preparation method. The lithium mica granule insulating brick is made from the following raw materials by weight percentage: 40%–80% lithium mica granules and 20%–60% cement. The lithium mica granules are prepared from lithium mica through granulation, calcination, and leaching. In this invention, the lithium mica granules have characteristics such as low density, high porosity, low thermal conductivity, and high strength. When compounded with cement, they form a lithium mica granule insulating brick that is lightweight, has high compressive strength, and excellent thermal insulation performance. The lithium mica granules used can be used directly without the need for pretreatment such as grinding and drying. The preparation process is simpler, more convenient, and has lower energy consumption, making it suitable for large-scale production and facilitating the industrial application of lithium mica granule insulating bricks. Furthermore, the large quantity of lithium mica granules used enables large-scale resource utilization of lithium mica and effectively solves the environmental problems associated with lithium mica granules.

Description

Technical Field

[0001] This invention belongs to the field of building materials technology and relates to a lithium mica particle thermal insulation brick and its preparation method. Background Technology

[0002] Lithium mica is an important raw material for the smelting and production of lithium carbonate. However, the process of smelting lithium mica to produce lithium carbonate generates a large amount of leaching residue. This lithium mica leaching residue is both a usable resource and a pollutant. Therefore, finding an effective method to dispose of lithium mica leaching residue is a major challenge we face at present.

[0003] Currently, the main disposal method used in the industry is to pile up lepidolite leaching residue in tailings disposal sites, which has the following drawbacks: it requires a large amount of land and has high construction costs; the large stockpile leads to high operation and maintenance pressure and costs; and it may damage the local ecological environment.

[0004] To address the aforementioned issues, researchers have proposed strategies for using lepidolite leaching residue as a raw material in the construction industry, primarily in two ways: First, using lepidolite leaching residue to produce composite gel materials. For example, mixing and grinding lithium slag, silicate cement, and silica fume yields composite cementitious materials; or mixing powdered lithium slag with fly ash, activators, water-reducing agents, chelating agents, and water, followed by curing, yields lithium slag geopolymer materials; another example is using lepidolite leaching residue as a cement admixture to prepare silicate cement. Second, using lepidolite leaching residue as a raw material to produce building bricks. For example, mixing lepidolite leaching residue with construction waste and ceramic waste, followed by sintering, yields ceramic bricks. However, these methods still suffer from the following drawbacks: high energy consumption, low lepidolite leaching residue consumption, and difficulty in large-scale disposal of lepidolite leaching residue. In addition, in order to increase the consumption of lepidolite slag, some researchers have proposed a method for preparing calcium silicate boards using lepidolite slag. The method uses lepidolite slag, cement, and pulp as raw materials to make a slurry, and then the slurry is shaped, pre-cured, and autoclaved to make calcium silicate boards. However, this method still has the following defects: (1) The lepidolite slag used is made from lepidolite and sulfate as raw materials, and is obtained by mixing, roasting, water immersion, and solid-liquid separation. The lepidolite slag is a fine powder with low porosity, high density, high thermal conductivity, and low strength. When used to prepare calcium silicate boards, it is not conducive to improving compressive strength and does not have good heat insulation effect. The heat preservation effect is poor. Furthermore, although Adding pulp can improve bending strength and reduce density, but it is still difficult to effectively improve compressive strength and reduce the weight of calcium silicate board. In particular, it is difficult to effectively reduce thermal conductivity, which is not conducive to improving the insulation effect. In addition, adding a large amount of pulp will inevitably reduce the consumption of lithium mica residue and increase production costs. (2) Before use, lithium mica residue needs to be screened and the pulp needs to be steam-cured. This makes the preparation process complicated, inconvenient to operate, harsh preparation conditions, high preparation cost and low preparation efficiency. It is difficult to quickly consume large-scale lithium mica residue and is not conducive to the industrial application of lithium mica residue. Therefore, obtaining a lithium mica residue with low density, high porosity, low thermal conductivity and high strength, and making it into a lightweight, high compressive strength and excellent insulation brick is of great significance for the large-scale consumption of lithium mica residue and the harmless treatment and resource utilization of lithium mica residue. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a lightweight, high compressive strength, and excellent thermal insulation brick with lithium mica particles and its preparation method, addressing the aforementioned problems of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A lithium mica granule insulating brick, wherein the lithium mica granule insulating brick is made from the following raw materials by weight percentage:

[0008] Lithium mica particles 40%–80%,

[0009] Cement 20%–60%;

[0010] The lepidolite granules are prepared by granulation, roasting, and leaching of lepidolite as raw material.

[0011] A further improvement to the aforementioned lithium mica-bearing insulating brick is that the preparation method of the lithium mica-bearing particles includes the following steps:

[0012] S1. Mix lepidolite concentrate, roasting additives and volatile binders to obtain mixture B;

[0013] S2. Finely grind mixture B until the particle size is above 200 mesh to obtain mixture C;

[0014] S3. Mix mixture C with water to obtain mixture D;

[0015] S4. Granulate the mixture D to obtain lithium mica concentrate particles;

[0016] S5. Roasting of lithium ore concentrate particles.

[0017] S6. The product obtained after calcination is leached and the solid and liquid are separated to obtain lithium mica particles.

[0018] In a further improvement of the above-mentioned lithium mica granule insulating brick, in step S1, the mass ratio of the lithium mica concentrate to the roasting additive is 1:0.1 to 0.8; the amount of the volatile binder added is 1% to 10% of the total mass of the lithium mica concentrate and the roasting additive; the roasting additive is at least one of calcium sulfate, calcium carbonate, sodium sulfate and potassium sulfate or a mixture thereof; the lithium ore concentrate contains ≥1.5% lithium by mass; and the volatile binder is at least one of semi-coke and petroleum coke.

[0019] In a further improvement of the above-mentioned lithium mica granule insulating brick, in step S2, the particle size of the mixture C is 300 mesh to 1000 mesh.

[0020] In a further improvement to the above-mentioned lithium mica granule insulating brick, in step S3, the amount of water added is 5% to 20% of the total mass of the mixture C.

[0021] In a further improvement of the above-mentioned lithium mica granule insulation brick, in step S4, the particle size of the lithium mica concentrate particles is 8mm to 10mm.

[0022] In a further improvement of the above-mentioned lithium mica granule insulating brick, in step S5, a rotary kiln is used to roast the lithium ore concentrate particles; the roasting temperature is 850℃~900℃; and the roasting time is 30min~50min.

[0023] In a further improvement of the above-mentioned lithium mica granule insulating brick, in step S6, the product obtained after calcination is placed in water for leaching; the liquid-solid ratio is controlled at 0.8 to 1:1 during the leaching process; and the leaching time is 3 to 4 days.

[0024] The aforementioned lithium mica particle insulating brick is further improved in that it is made from the following raw materials by weight percentage:

[0025] Lithium mica particles 60%–80%,

[0026] Cement content: 20%–40%.

[0027] In a further improvement of the above-mentioned lithium mica insulating brick, the particle size of the lithium mica particles is distributed between 5 mm and 10 mm; the cement is at least one of composite silicate cement, slag silicate cement, fly ash silicate cement, and aluminoferrite cement.

[0028] As a general technical concept, the present invention also provides a method for preparing lithium mica particle insulating bricks, comprising the following steps:

[0029] (1) Mix cement and water, stir, and obtain slurry;

[0030] (2) Add lepidolite particles to the slurry and stir to obtain a mixture; the lepidolite particles are prepared by granulation, calcination and leaching of lepidolite as raw material;

[0031] (3) The mixture is pressed and cured to obtain lithium mica particle insulation brick.

[0032] The above-mentioned method for preparing lithium mica granule insulating bricks is further improved in that, in step (1), the amount of water added is 15% to 20% of the cement mass; the cement is at least one of composite silicate cement, slag silicate cement, fly ash silicate cement, and aluminoferrite cement.

[0033] The above-mentioned method for preparing lithium mica insulating bricks is further improved in step (2), wherein the mass ratio of lithium mica particles to cement in the mixture is 2-4:1-3; and the particle size of the lithium mica particles is distributed between 5mm and 10mm.

[0034] The above-mentioned method for preparing lithium mica insulating bricks is further improved in that, in step (2), the method for preparing lithium mica includes the following steps:

[0035] S1. Mix lepidolite concentrate, roasting additives and volatile binders to obtain mixture B;

[0036] S2. Finely grind mixture B until the particle size is above 200 mesh to obtain mixture C;

[0037] S3. Mix mixture C with water to obtain mixture D;

[0038] S4. Granulate the mixture D to obtain lithium mica concentrate particles;

[0039] S5. Roasting of lithium ore concentrate particles.

[0040] S6. The product obtained after calcination is leached and the solid and liquid are separated to obtain lithium mica particles.

[0041] In a further improvement to the above-mentioned method for preparing lithium mica granule insulating bricks, in step S1, the mass ratio of the lithium mica concentrate to the roasting additive is 1:0.1 to 0.8; the amount of volatile binder added is 1% to 10% of the total mass of the lithium mica concentrate and the roasting additive; the roasting additive is at least one of calcium sulfate, calcium carbonate, sodium sulfate, and potassium sulfate, or a mixture thereof; the lithium ore concentrate contains ≥1.5% lithium by mass; and the volatile binder is at least one of semi-coke and petroleum coke.

[0042] In a further improvement to the above-mentioned method for preparing lithium mica granule insulating bricks, in step S2, the particle size of the mixture C is 300 mesh to 1000 mesh.

[0043] In a further improvement to the above-mentioned method for preparing lithium mica granule insulating bricks, in step S3, the amount of water added is 5% to 20% of the total mass of the mixture C.

[0044] In a further improvement to the above-mentioned method for preparing lithium mica granule insulating bricks, in step S4, the particle size of the lithium mica concentrate particles is 8mm to 10mm.

[0045] The above-mentioned method for preparing lithium mica granule insulating bricks is further improved by step S5, in which a rotary kiln is used to roast the lithium ore concentrate particles; the roasting temperature is 850℃~900℃; and the roasting time is 30min~50min.

[0046] In a further improvement to the above-mentioned method for preparing lithium mica granule insulating bricks, in step S6, the product obtained after calcination is placed in water for leaching; the liquid-solid ratio is controlled to be 0.8 to 1:1 during the leaching process; and the leaching time is 3 to 4 days.

[0047] The above-mentioned method for preparing lithium mica granule insulating bricks is further improved in step (3) by controlling the pressure during the pressing process to be 5MPa to 15MPa; the pressing time to be 5s to 20s; and the curing time to be 28 days.

[0048] Compared with the prior art, the advantages of the present invention are as follows:

[0049] (1) To address the shortcomings of existing lepidolite slag, such as low porosity, high density, high thermal conductivity, and low strength, and the resulting defects in brick compressive strength and poor thermal insulation, this invention creatively proposes a lepidolite granule insulating brick. The lepidolite granules used are lepidolite leaching residue prepared from lepidolite as raw material through granulation, calcination, and leaching. This lepidolite leaching residue is a porous particle with a rich pore structure, characterized by low density, high porosity, low thermal conductivity, and high strength. Therefore, when it is compounded with cement, the cement's bonding effect can be used to tightly bind the lepidolite granules together. Furthermore, by optimizing the proportions of both, a lepidolite granule insulating brick with lightweight, high compressive strength, and excellent thermal insulation performance can be formed. In addition, the lepidolite granule insulating brick of this invention requires a large amount of lepidolite granules. By disposing of a large amount of lepidolite granules, the land occupied by stockpiling and their adverse impact on the ecological environment can be reduced, which is beneficial to reducing the risk of secondary pollution.

[0050] (2) This invention also provides a method for preparing lithium mica-based insulating bricks. First, cement and water are mixed to form a slurry, then lithium mica is added to form a mixture. Finally, the mixture is pressed, molded, and cured to obtain lithium mica-based insulating bricks that are lightweight, have high compressive strength, and excellent thermal insulation performance. The lithium mica used in this method can be directly utilized without the need for pretreatment such as grinding and drying. The preparation process is simpler, easier to operate, and consumes less energy, making it suitable for large-scale production and facilitating the industrial application of lithium mica-based insulating bricks. Furthermore, the large quantity of lithium mica used enables large-scale resource utilization of lithium mica, solving the resource waste and environmental problems caused by the large-scale stockpiling of lithium mica. Attached Figure Description

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0052] Figure 1 This is a schematic diagram of the preparation process of lithium mica particle insulation bricks in Embodiment 1 of the present invention. Detailed Implementation

[0053] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention. Unless otherwise specified, all materials and instruments used in the following embodiments are commercially available.

[0054] Example 1

[0055] A lithium mica particle insulation brick is made from the following raw materials by weight percentage:

[0056] Lithium mica particles 40%,

[0057] Cement 60%.

[0058] In this embodiment, the lepidolite granules are leaching residue produced from the smelting of lithium carbonate from lepidolite. Their main chemical components are: SiO2 content 35-45wt%, Fe2O3 content 7-10%, and CaO content 10-14%. The mica granules contain 10-30% water and have a particle size distribution between 5-10mm. Specifically, the lepidolite granules used are prepared from lepidolite as raw material through granulation, calcination, and leaching, including the following steps:

[0059] S1. Take 100 kg of lepidolite concentrate (100 mesh, lithium content 2%) and mix it with roasting additives at a mass ratio of 1:0.6. The roasting additives are a mixture of calcium sulfate, calcium carbonate, sodium sulfate, and potassium sulfate, and the mass ratio of lepidolite concentrate to calcium sulfate, calcium carbonate, sodium sulfate, and potassium sulfate is 1:0.3:0.1:0.1:0.1, ensuring that the lepidolite concentrate and roasting additives are mixed evenly and in full contact, resulting in mixture A. In this invention, the type of roasting additive and the proportion of different types of roasting additives can be adjusted according to actual conditions.

[0060] S2. Mixing mixture A with the roasting additive (semi-coke) at a ratio of 3% of the total mass of mixture A, the lithium mica concentrate and roasting additive are bonded together under the action of the semi-coke, resulting in mixture B. In this invention, the lithium ore concentrate and roasting additive are mixed first, and then a volatile binder is added. This not only facilitates the formation of a material with good mixing uniformity but also increases the contact area between the lithium mica concentrate and the roasting additive.

[0061] S3. Add mixture B to the ball mill and grind it until the particle size reaches 300 mesh to obtain mixture C.

[0062] S4. Add water at a rate of 8% of the total mass of mixture C, and mix mixture C with water to obtain mixture D.

[0063] S5. The mixture D is granulated using a disc granulator to obtain lithium mica concentrate particles with a particle size of 10 mm.

[0064] S6. The lithium ore concentrate particles are roasted in a rotary kiln at a temperature of 900℃ for 45 minutes.

[0065] S7. The product obtained after calcination is placed in water for leaching at a liquid-to-solid ratio of 0.8:1 for 4 days. Solid-liquid separation is then performed to obtain lithium mica particles.

[0066] In this embodiment, the cement is composite silicate cement (commercially available).

[0067] A method for preparing the lithium mica particle insulating brick described in this embodiment is shown in the following process flow diagram. Figure 1 As shown, it includes the following steps:

[0068] (1) Add cement to a mixer and mix. During the mixing process, add water that accounts for 20% of the cement mass and mix evenly to obtain a slurry.

[0069] (2) Add lepidolite particles to the slurry and stir evenly to obtain a mixture of cement and lepidolite particles. The mass ratio of lepidolite particles to cement in the mixture is 2:3.

[0070] (3) Inject the mixture into the molding machine, press it under 5MPa pressure for 15s, demold it, and form a thermal insulation brick blank.

[0071] (4) The insulation brick blank is placed under normal temperature conditions for curing and solidification for 28 days to obtain the finished lithium mica particle insulation brick.

[0072] Example 2

[0073] A lithium mica particle insulation brick is made from the following raw materials by weight percentage:

[0074] Lithium mica particles 50%,

[0075] Cement 50%.

[0076] In this embodiment, the lithium mica particles used are the same as those in Example 1.

[0077] In this embodiment, the cement used is the same as that in Example 1.

[0078] A method for preparing the lithium mica particle insulating brick in this embodiment includes the following steps:

[0079] (1) Add cement to a mixer and mix. During the mixing process, add water that accounts for 20% of the cement mass and mix evenly to obtain a slurry.

[0080] (2) Add lepidolite particles to the slurry and stir evenly to obtain a mixture of cement and lepidolite particles. The mass ratio of lepidolite particles to cement in the mixture is 1:1.

[0081] (3) Inject the mixture into the molding machine, press it under 5MPa pressure for 15s, demold it, and form a thermal insulation brick blank.

[0082] (4) The insulation brick blank is placed under normal temperature conditions for curing and solidification for 28 days to obtain the finished lithium mica particle insulation brick.

[0083] Example 3

[0084] A lithium mica particle insulation brick is made from the following raw materials by weight percentage:

[0085] Lithium mica particles 60%,

[0086] Cement 40%.

[0087] In this embodiment, the lithium mica particles used are the same as those in Example 1.

[0088] In this embodiment, the cement used is the same as that in Example 1.

[0089] A method for preparing the lithium mica particle insulating brick in this embodiment includes the following steps:

[0090] (1) Add cement to a mixer and mix. During the mixing process, add water that accounts for 20% of the cement mass and mix evenly to obtain a slurry.

[0091] (2) Add lepidolite particles to the slurry and stir evenly to obtain a mixture of cement and lepidolite particles. The mass ratio of lepidolite particles to cement in the mixture is 3:2.

[0092] (3) Inject the mixture into the molding machine, press it under 5MPa pressure for 15s, demold it, and form a thermal insulation brick blank.

[0093] (4) The insulation brick blank is placed under normal temperature conditions for curing and solidification for 28 days to obtain the finished lithium mica particle insulation brick.

[0094] Example 4

[0095] A lithium mica particle insulation brick is made from the following raw materials by weight percentage:

[0096] Lithium mica particles 80%,

[0097] Cement 20%.

[0098] In this embodiment, the lithium mica particles used are the same as those in Example 1.

[0099] In this embodiment, the cement used is the same as that in Example 1.

[0100] A method for preparing the lithium mica particle insulating brick in this embodiment includes the following steps:

[0101] (1) Add cement to a mixer and mix. During the mixing process, add water that accounts for 20% of the cement mass and mix evenly to obtain a slurry.

[0102] (2) Add lepidolite particles to the slurry and stir evenly to obtain a mixture of cement and lepidolite particles. The mass ratio of lepidolite particles to cement in the mixture is 4:1.

[0103] (3) Inject the mixture into the molding machine, press it under 5MPa pressure for 15s, demold it, and form a thermal insulation brick blank.

[0104] (4) The insulation brick blank is placed under normal temperature conditions for curing and solidification for 28 days to obtain the finished lithium mica particle insulation brick.

[0105] Example 5

[0106] A lithium mica particle insulation brick is made from the following raw materials by weight percentage:

[0107] Lithium mica particles 60%,

[0108] Cement 40%.

[0109] In this embodiment, the lithium mica particles used are the same as those in Example 1.

[0110] In this embodiment, the cement used is the same as that in Example 1.

[0111] A method for preparing the lithium mica particle insulating brick in this embodiment includes the following steps:

[0112] (1) Add cement to a mixer and mix. During the mixing process, add water at a ratio of 15% of the cement mass and mix evenly to obtain a slurry.

[0113] (2) Add lepidolite particles to the slurry and stir evenly to obtain a mixture of cement and lepidolite particles. The mass ratio of lepidolite particles to cement in the mixture is 3:2.

[0114] (3) Inject the mixture into the molding machine, press it under 10MPa pressure for 15s, demold it, and form a thermal insulation brick blank.

[0115] (4) The insulation brick blank is placed under normal temperature conditions for curing and solidification for 28 days to obtain the finished lithium mica particle insulation brick.

[0116] Example 6

[0117] A lithium mica particle insulation brick is made from the following raw materials by weight percentage:

[0118] Lithium mica particles 60%,

[0119] Cement 40%.

[0120] In this embodiment, the lithium mica particles used are the same as those in Example 1.

[0121] In this embodiment, the cement used is the same as that in Example 1.

[0122] A method for preparing the lithium mica particle insulating brick in this embodiment includes the following steps:

[0123] (1) Add cement to a mixer and mix. During the mixing process, add water accounting for 12% of the cement mass and mix evenly to obtain slurry.

[0124] (2) Add lepidolite particles to the slurry and stir evenly to obtain a mixture of cement and lepidolite particles. The mass ratio of lepidolite particles to cement in the mixture is 3:2.

[0125] (3) Inject the mixture into the molding machine, press it under 15MPa pressure for 15s, demold it, and form a thermal insulation brick blank.

[0126] (4) The insulation brick blank is placed under normal temperature conditions for curing and solidification for 28 days to obtain the finished lithium mica particle insulation brick.

[0127] Example 7

[0128] A lithium mica particle insulation brick is made from the following raw materials by weight percentage:

[0129] Lithium mica particles 80%,

[0130] Cement 20%.

[0131] In this embodiment, the lithium mica particles used are the same as those in Example 1.

[0132] In this embodiment, the cement used is the same as that in Example 1.

[0133] A method for preparing the lithium mica particle insulating brick in this embodiment includes the following steps:

[0134] (1) Add cement to a mixer and mix. During the mixing process, add water at a ratio of 15% of the cement mass and mix evenly to obtain a slurry.

[0135] (2) Add lepidolite particles to the slurry and stir evenly to obtain a mixture of cement and lepidolite particles. The mass ratio of lepidolite particles to cement in the mixture is 4:1.

[0136] (3) Inject the mixture into the molding machine, press it under 15MPa pressure for 15s, demold it, and form a thermal insulation brick blank.

[0137] (4) The insulation brick blank is placed under normal temperature conditions for curing and solidification for 28 days to obtain the finished lithium mica particle insulation brick.

[0138] Comparative Example 1

[0139] A lithium mica slag insulation brick and its preparation method are basically the same as those in Example 1, except that in Comparative Example 1, lithium mica slag is used instead of lithium mica particles. The lithium mica slag is the leaching residue obtained by traditional powder leaching. Specifically, lithium mica and sulfate are used as raw materials, and the mixture is mixed, roasted, leached in water, and separated into solid and liquid to obtain lithium mica slag.

[0140] Comparative Example 2

[0141] A lithium mica slag insulation brick and its preparation method are basically the same as those in Example 4, except that in Comparative Example 2, lithium mica slag is used instead of lithium mica particles. The lithium mica slag is the leaching residue obtained by traditional powder leaching. Specifically, lithium mica and sulfate are used as raw materials, and the mixture is mixed, roasted, leached in water, and separated into solid and liquid to obtain lithium mica slag.

[0142] Tests: The compressive strength of the specimens was tested under standard conditions for 7 days and 28 days, according to GB / T 2542-2012 "Test Methods for Masonry Bricks". The test results of compressive strength, frost resistance and thermal conductivity of the lithium mica particle insulating bricks prepared in Examples 1-7 and the lithium mica slag insulating bricks prepared in Comparative Examples 1-2 are shown in Table 1.

[0143] Table 1 shows the compressive strength, thermal conductivity, and density values ​​of each insulating brick in Examples 1-7 and Comparative Examples 1-2.

[0144]

[0145]

[0146] As shown in Table 1, compared with conventional lithium mica slag insulation bricks made from powdered lithium mica slag, the lithium mica particle insulation bricks prepared by this invention have higher compressive strength and better thermal insulation performance. This is because the lithium mica particles used in this invention have the characteristics of low density, high porosity, low thermal conductivity, and high strength. They are porous particles with rich pore structure. When used to prepare insulation bricks, they can not only play a good role in heat insulation but also play a supporting role, significantly improving the strength of the bricks, especially the compressive strength. The compressive strength of the lithium mica particle insulation bricks is greater than 20 MPa, and the thermal conductivity is less than 0.3 W / (m·K). Obviously, this is something that conventional lithium mica slag insulation bricks do not possess.

[0147] As the results above show, this invention uses lepidolite particles, which are characterized by low density, high porosity, low thermal conductivity, and high strength, as raw materials. As a porous particle with a rich pore structure, lepidolite particles can be tightly bound together using only the bonding effect of cement, forming lepidolite insulating bricks that are lightweight, have high compressive strength, and excellent thermal insulation performance. Furthermore, the lepidolite particles used can be used directly without the need for pretreatment such as grinding and drying, making the preparation process simpler, more convenient, and with lower energy consumption. This makes it suitable for large-scale production and facilitates the industrial application of lepidolite insulating bricks. Moreover, the large quantity of lepidolite used enables large-scale resource utilization of lepidolite, solving the resource waste and environmental problems caused by large-scale stockpiling of lepidolite. This invention, by using lepidolite particles to prepare insulating bricks, provides a new pathway for the treatment of lepidolite particles, improves the utilization rate of lepidolite smelting slag, and brings significant environmental benefits.

[0148] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A lithium mica particle insulating brick, characterized in that, The lithium mica insulating brick is made from the following raw materials by weight percentage: Lithium mica particles 40%–80%, Cement 20%–60%; The lepidolite granules are prepared by granulation, calcination, and leaching of lepidolite as raw material; the preparation method of the lepidolite granules includes the following steps: S1. Lithium mica concentrate, roasting additive, and volatile binder are mixed to obtain mixture B; the mass ratio of lithium mica concentrate to roasting additive is 1:0.1-0.8; the amount of volatile binder added is 1%-10% of the total mass of lithium mica concentrate and roasting additive; the roasting additive is at least one of calcium sulfate, calcium carbonate, sodium sulfate, and potassium sulfate, or a mixture thereof; the lithium mass percentage in the lithium mica concentrate is ≥1.5%; the volatile binder is at least one of semi-coke and petroleum coke. S2. Grind mixture B into fine powder until the particle size is 300-1000 mesh to obtain mixture C. S3. Mix mixture C with water to obtain mixture D; the amount of water added is 5% to 20% of the total mass of mixture C. S4. Granulate the mixture D to obtain lithium mica concentrate particles; the particle size of the lithium mica concentrate particles is 8mm to 10mm. S5. The lithium mica concentrate particles are roasted in a rotary kiln; the roasting temperature is 850℃~900℃; the roasting time is 30min~50min. S6. The product obtained after roasting is placed in water for leaching, and solid-liquid separation is performed to obtain lithium mica particles; the liquid-solid ratio is controlled at 0.8 to 1:1 during the leaching process; the leaching time is 3 to 4 days.

2. The lithium mica particle insulating brick according to claim 1, characterized in that, The lithium mica insulating brick is made from the following raw materials by weight percentage: Lithium mica particles 60%–80%, Cement 20%–40%.

3. The lithium mica particle insulating brick according to claim 2, characterized in that, The particle size of the lithium mica particles is between 5 mm and 10 mm; the cement is at least one of composite silicate cement, slag silicate cement, fly ash silicate cement, and aluminoferrite cement.

4. A method for preparing lithium mica particle insulating bricks, characterized in that, Includes the following steps: (1) Mix cement and water, stir, and obtain slurry; (2) Add the lithium mica particles to the slurry and stir to obtain a mixture; the lithium mica particles are prepared by granulation, calcination and leaching of lithium mica as raw material; The preparation method of the lithium mica particles includes the following steps: S1. Lithium mica concentrate, roasting additive, and volatile binder are mixed to obtain mixture B; the mass ratio of lithium mica concentrate to roasting additive is 1:0.1-0.8; the amount of volatile binder added is 1%-10% of the total mass of lithium mica concentrate and roasting additive; the roasting additive is at least one of calcium sulfate, calcium carbonate, sodium sulfate, and potassium sulfate, or a mixture thereof; the lithium mass percentage in the lithium mica concentrate is ≥1.5%; the volatile binder is at least one of semi-coke and petroleum coke. S2. Grind mixture B into fine powder until the particle size is 300-1000 mesh to obtain mixture C; S3. Mix mixture C with water to obtain mixture D; the amount of water added is 5% to 20% of the total mass of mixture C. S4. Granulate the mixture D to obtain lithium mica concentrate particles; the particle size of the lithium mica concentrate particles is 8mm to 10mm. S5. The lithium mica concentrate particles are roasted in a rotary kiln; the roasting temperature is 850℃~900℃; the roasting time is 30min~50min. S6. The product obtained after calcination is placed in water for leaching, and solid-liquid separation is performed to obtain lithium mica particles; the liquid-solid ratio is controlled at 0.8 to 1:1 during the leaching process; the leaching time is 3 to 4 days. (3) The mixture is pressed and cured to obtain lithium mica particle insulation brick.

5. The method for preparing lithium mica particle insulating bricks according to claim 4, characterized in that, In step (1), the amount of water added is 12% to 20% of the cement mass; the cement is at least one of composite silicate cement, slag silicate cement, fly ash silicate cement, and aluminoferrite cement. In step (2), the mass ratio of lepidolite particles to cement in the mixture is 2-4:1-3; the particle size of the lepidolite particles is distributed between 5mm and 10mm.

6. The method for preparing lithium mica particle insulating bricks according to claim 4 or 5, characterized in that, In step (3), the pressure during the pressing process is controlled at 5 MPa to 15 MPa; the pressing time is 5 s to 20 s; and the curing time is 28 days.

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