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CN-118908642-B - Lepidolite particle insulating brick and preparation method thereof

CN118908642BCN 118908642 BCN118908642 BCN 118908642BCN-118908642-B

Abstract

The invention discloses a lepidolite particle insulating brick and a preparation method thereof, wherein the lepidolite particle insulating brick is prepared from 40-80% of lepidolite particles and 20-60% of cement by mass percent, and the lepidolite particles are prepared by granulating, roasting and leaching lepidolite particles serving as raw materials. The lepidolite particles have the characteristics of low density, high porosity, low heat conductivity coefficient, high strength and the like, and can form the lepidolite particle heat-insulating brick with light weight, high compressive strength and excellent heat-insulating performance after being compounded with cement, the adopted lepidolite particles can be directly utilized, pretreatment such as grinding, drying and the like is not needed, the preparation process is simpler, the operation is more convenient, the production energy consumption is lower, the lepidolite particle heat-insulating brick is suitable for large-scale preparation, the industrial application of the lepidolite particle heat-insulating brick is convenient to realize, the consumption of the adopted lepidolite particles is large, the mass resource utilization of the lepidolite particles can be realized, and the environmental problem of the lepidolite particles can be effectively solved.

Inventors

  • CHEN YIHENG
  • ZENG QINGPO
  • ZHOU KAI
  • TONG HAOWEN
  • HUANG BINGJIE
  • CHEN ZEJIAN
  • ZHANG QINGYU

Assignees

  • 湖南紫金锂多金属新材料有限公司

Dates

Publication Date
20260505
Application Date
20240611

Claims (6)

  1. 1. The lepidolite grain insulating brick is characterized by being prepared from the following raw materials in percentage by mass: 40% -80% of lepidolite particles, 20% -60% Of cement; The lepidolite particles are prepared by taking lepidolite as a raw material and granulating, roasting and leaching, and the preparation method of the lepidolite particles comprises the following steps: S1, mixing lepidolite concentrate, a roasting additive and a volatile binder to obtain a mixture B, wherein the mass ratio of the lepidolite concentrate to the roasting additive is 1:0.1-0.8, the addition amount of the volatile binder is 1-10% of the total mass of the lepidolite 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 of the calcium sulfate, the mass percentage of lithium in the lepidolite concentrate is more than or equal to 1.5%, and the volatile binder is at least one of semi-coke and petroleum coke; s2, carrying out fine grinding treatment on the mixture B until the particle size is 300-1000 meshes to obtain a mixture C; s3, mixing the mixture C with water to obtain a mixture D, wherein the addition amount of the water is 5% -20% of the total mass of the mixture C; S4, granulating the mixture D to obtain lepidolite concentrate particles, wherein the particle size of the lepidolite concentrate particles is 8-10 mm; S5, roasting lepidolite concentrate particles by adopting a rotary kiln, wherein the roasting temperature is 850-900 ℃, and the roasting time is 30-50 min; and S6, placing the roasted product into water for leaching, and carrying out solid-liquid separation to obtain lepidolite particles, wherein the liquid-solid ratio is controlled to be 0.8-1:1 in the leaching process, and the leaching time is 3-4 days.
  2. 2. The lepidolite particle insulation brick of claim 1, wherein the lepidolite particle insulation brick is prepared from the following raw materials in percentage by mass: 60% -80% of lepidolite particles, 20% -40% Of cement.
  3. 3. The lepidolite grain insulating brick according to claim 2, wherein the lepidolite grain has a grain size distribution of 5 mm-10 mm, and the cement is at least one of composite silicate cement, slag silicate cement, fly ash silicate cement and aluminoferrite cement.
  4. 4. The preparation method of the lepidolite grain insulating brick is characterized by comprising the following steps of: (1) Mixing cement and water, and stirring to obtain slurry; (2) Adding lepidolite particles into the slurry, and stirring to obtain a mixture; the lepidolite particles are prepared by taking lepidolite as a raw material and granulating, roasting and leaching, and the preparation method of the lepidolite particles comprises the following steps: S1, mixing lepidolite concentrate, a roasting additive and a volatile binder to obtain a mixture B, wherein the mass ratio of the lepidolite concentrate to the roasting additive is 1:0.1-0.8, the addition amount of the volatile binder is 1-10% of the total mass of the lepidolite 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 of the calcium sulfate, the mass percentage of lithium in the lepidolite concentrate is more than or equal to 1.5%, and the volatile binder is at least one of semi-coke and petroleum coke; s2, carrying out fine grinding treatment on the mixture B until the particle size is 300-1000 meshes to obtain a mixture C; s3, mixing the mixture C with water to obtain a mixture D, wherein the addition amount of the water is 5% -20% of the total mass of the mixture C; S4, granulating the mixture D to obtain lepidolite concentrate particles, wherein the particle size of the lepidolite concentrate particles is 8-10 mm; S5, roasting lepidolite concentrate particles by adopting a rotary kiln, wherein the roasting temperature is 850-900 ℃, and the roasting time is 30-50 min; S6, placing the roasted product in water for leaching, and carrying out solid-liquid separation to obtain lepidolite particles, wherein the liquid-solid ratio is controlled to be 0.8-1:1 in the leaching process, and the leaching time is 3-4 days; (3) And (3) carrying out compression molding and maintenance on the mixture to obtain the lepidolite particle insulating brick.
  5. 5. The method for preparing the lepidolite grain insulating brick according to claim 4, wherein in the step (1), the addition amount of water is 12-20% of the mass of cement, and the cement is at least one of composite silicate cement, slag silicate cement, fly ash silicate cement and aluminoferrite cement; In the step (2), the mass ratio of lepidolite particles to cement in the mixture is 2-4:1-3, and the particle size distribution of the lepidolite particles is 5 mm-10 mm.
  6. 6. The method for preparing the lepidolite grain insulating brick according to claim 4 or 5, wherein in the step (3), the control pressure is 5-15 MPa in the pressing forming process, the pressing forming time is 5-20 s, and the curing time is 28 days.

Description

Lepidolite particle insulating brick and preparation method thereof Technical Field The invention belongs to the technical field of building materials, and relates to a lepidolite grain insulating brick and a preparation method thereof. Background Lepidolite is an important raw material for smelting and producing lithium carbonate, and a large amount of leaching residues are generated in the process of smelting and producing lithium carbonate by using lepidolite, and the leaching residues of lepidolite are not only an available resource but also a pollutant, so that the effective treatment method for obtaining the leaching residues of lepidolite is a great difficulty facing the current stage. At present, the main disposal mode adopted in the industry is to pile lepidolite leaching residues in a tailing digestion field, and the defects of large occupied land, high construction cost, large piling quantity, high operation and maintenance pressure, high cost and capacity of damaging the local ecological environment are overcome. In order to solve the problems, researchers have proposed a strategy for using lepidolite leaching residues as raw materials in the construction industry, wherein the method mainly comprises the steps of firstly preparing a composite gel material by using lepidolite leaching residues as raw materials, for example, mixing and grinding materials such as the lepidolite leaching residues, silicate cement and silica fume to obtain the composite gel material, or mixing and curing powdery lepidolite leaching residues with fly ash, an exciting agent, a water reducing agent, a chelating agent and water to obtain a lepidolite geopolymer material, and for example, preparing the silicate cement by using lepidolite leaching residues as cement admixture. And secondly, the lepidolite leaching slag is used as a raw material to prepare the building brick, for example, the lepidolite leaching slag is used as a raw material, and the building brick is mixed with materials such as construction waste, ceramic waste and the like and sintered to obtain the ceramic brick. The treatment method still has the defects of high energy consumption, low consumption of lepidolite leaching slag and difficulty in large-scale absorption of lepidolite leaching slag. In addition, in order to increase the consumption of the lepidolite slag, researchers have proposed a method for preparing a calcium silicate board by using the lepidolite slag, cement and paper pulp as raw materials to prepare slurry, then molding, pre-curing and autoclaved curing the slurry to prepare the calcium silicate board, and the method still has the following defects that (1) the adopted lepidolite slag is prepared by taking lepidolite and sulfate as raw materials through mixing, roasting, water immersion and solid-liquid separation, and is fine powder with low porosity, high density, high heat conductivity and low strength, when the lepidolite slag is used for preparing the calcium silicate board, the compression strength is not easy to be improved, the good heat insulation effect is not realized, the heat preservation effect is poor, and further, although the bending strength and the density are improved by adding paper pulp, the compression strength is difficult to be effectively improved, and the weight of the calcium silicate board is difficult to be effectively reduced, the heat preservation effect is not easy to be improved, the consumption of the lepidolite slag is also inevitably reduced, and the production cost is increased, and (2) the lepidolite slag is difficult to be rapidly cured, the lithium mica slag is difficult to be prepared by using the slurry, the high-heat conductivity is easy to be subjected to rapid and the preparation and the high-heat insulation process, and the industrial-absorption efficiency is difficult to realize, and the large-scale preparation of the lithium mica slag is difficult to be easy to be subjected to the preparation and difficult to realize. Therefore, the lepidolite slag with low density, high porosity, low heat conductivity coefficient and high strength is obtained, and is made into the insulating brick with light weight, high compressive strength and excellent insulating property, and the lepidolite slag has very important significance for large-scale absorption of the lepidolite slag, and harmless treatment and recycling of the lepidolite slag. Disclosure of Invention Aiming at the problems in the prior art, the invention provides the lepidolite particle insulating brick with light weight, high compressive strength and excellent insulating property and the preparation method thereof. In order to solve the technical problems, the invention adopts the following technical scheme: the lepidolite grain insulating brick is prepared from the following raw materials in percentage by mass: 40% -80% of lepidolite particles, 20% -60% Of cement; the lepidolite particles are prepared by taking lepidolite as a raw mate