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Production method of microcrystalline mullite type calcined kaolin, obtained product and application

A technology of calcined kaolin and microcrystalline mullite, which is applied in the production field of microcrystalline mullite type calcined kaolin and microcrystalline mullite type calcined kaolin, which can solve the problems of poor quality, limited application and high whiteness of calcined kaolin Calcined kaolin cannot use high-speed iron raw materials to achieve the effects of facilitating air circulation, improving economic benefits, and increasing effective space

Active Publication Date: 2020-04-17
山西超牌煅烧高岭土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a production method of microcrystalline mullite type calcined kaolin and the microcrystalline mullite type calcined kaolin prepared by the production method and the microcrystalline mullite type calcined kaolin used in ceramic glazes and high-quality clay bricks , lightweight mullite bricks and ceramic fiber cotton to solve the technical problems that the existing technology cannot use high-iron raw materials for the preparation of high-whiteness calcined kaolin and the poor quality of the prepared calcined kaolin.

Method used

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  • Production method of microcrystalline mullite type calcined kaolin, obtained product and application
  • Production method of microcrystalline mullite type calcined kaolin, obtained product and application
  • Production method of microcrystalline mullite type calcined kaolin, obtained product and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The composition of high-iron gangue raw materials (content is calculated after calcination, the same below) is shown in Table 1:

[0047] SiO 2

Al 2 O 3

Fe 2 O 3

TiO 2

other 54.1％43.2％0.8％1.1％0.8％

[0048] 1) From Table 1, it can be seen that Al in the raw material 2 O 3 More than 30%, Fe 2 O 3 More than 0.4%, no need to add aluminum regulator,

[0049] 2) Crush the raw material obtained in step 1) and grind to 100 mesh to obtain a mixed powder,

[0050] 3) Add the mixed powder to water and mix it evenly to make a wet material. The weight ratio of the mixed powder to water is 75:25, and the moisture content of the wet material is 25%. The wet material is aged for 8 hours and squeezed to make it. After the bricks are stacked on the kiln car, they are dried until the moisture content is less than 5%. After drying, the kiln car enters the tunnel kiln for calcination. In the tunnel kiln, the oxidizing atmosphere is below 1100°C, and the reducing atmosphere is above 1100°C...

Embodiment 2

[0052] The composition of high-speed iron coal gangue raw materials is shown in Table 2:

[0053] SiO 2

Al 2 O 3

Fe 2 O 3

TiO 2

other 70.1％27.2％0.7％1.3％0.7％

[0054] 1) It can be seen from Table 2 that Al in the raw material 2 O 3 Less than 30%, Fe 2 O 3 More than 0.4%, add bauxite to adjust Al 2 O 3 Content to 32%,

[0055] 2) Crush the raw material obtained in step 1) and grind to 150 mesh to obtain a mixed powder,

[0056] 3) Add the mixed powder to water and mix it evenly to make a wet material. The weight ratio of the mixed powder to water is 90:10, and the moisture content of the wet material is 10%. The wet material is aged for 4 hours and then made by squeezing mud. After the bricks are stacked on the kiln car, they are dried until the moisture content is less than 5%. After drying, the kiln car enters the tunnel kiln for calcination. In the tunnel kiln, the oxidizing atmosphere is below 1100°C, and the reducing atmosphere is above 1100°C. The tunnel kiln includes th...

Embodiment 3

[0058] The composition of high-speed iron coal gangue raw materials is shown in Table 3 below:

[0059] SiO 2

Al 2 O 3

Fe 2 O 3

TiO 2

other 68.828.5％1.0％0.9％0.8％

[0060] 1) It can be seen from Table 3 that Al in the raw material 2 O 3 Less than 30%, Fe 2 O 3 More than 0.4%, add aluminum powder to adjust Al 2 O 3 Content to 38%,

[0061] 2) Crush the raw material obtained in step 1) and grind to 150 mesh to obtain a mixed powder,

[0062] 3) Add the mixed powder to water and mix evenly to make a wet material. The weight ratio of the mixed powder to water is 80:20, and the moisture content of the wet material is 20%. The wet material is aged for 2 hours and then made by squeezing mud. After the bricks are stacked on the kiln car, they are dried until the moisture content is less than 5%. After drying, the kiln car enters the tunnel kiln for calcination. In the tunnel kiln, the oxidizing atmosphere is below 1100°C, and the reducing atmosphere is above 1100°C. The tunnel kiln i...

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Abstract

The invention discloses a production method of microcrystalline mullite type calcined kaolin, the prepared microcrystalline mullite type calcined kaolin and application of the microcrystalline mullitetype calcined kaolin. The method comprises the following steps: 1) taking high-iron coal gangue with Fe2O3 content of more than or equal to 0.4% as a raw material; adjusting to enable Al2O3 content in the raw materials to be greater than or equal to 30%; (2) crushing and grinding the raw materials obtained in the step (1) to 100 meshes or above to obtain a mixed powder, (3) adding water into themixed powder, uniformly mixing to prepare a wet material, carrying out ageing and mud extruding to prepare bricks, stacking the bricks on a kiln car, drying, and calcining the kiln car in a tunnel kiln at 800-1350 DEG C to obtain the microcrystalline mullite type calcined kaolin. The calcined kaolin product prepared by the production method of the microcrystalline mullite type calcined kaolin is high in whiteness, uniform in chemical components and stable in microstructure, contains a large amount of mullite microcrystals, and is a preferred raw material for ceramic glaze, high-quality clay bricks, light mullite bricks and ceramic fiber cotton.

Description

Technical field [0001] The invention relates to the technical field of mineral processing, in particular to a method for producing microcrystalline mullite calcined kaolin. In addition, the present invention also relates to a microcrystalline mullite-type calcined kaolin prepared by the above-mentioned production method of microcrystalline mullite-type calcined kaolin and its application. Background technique [0002] my country is the world's largest coal-producing country. While producing coal, it produces a large amount of coal gangue associated with coal. For a long time, coal gangue has been dumped or buried as waste, which wastes resources, takes up land and pollutes the environment. In fact, research has found that the main component of coal gangue produced in my country’s main coal-producing areas is coal-measure kaolin, which is a unique kaolin resource in my country. It can be used to prepare kaolin products for papermaking, ceramic production, and preparation. Refract...

Claims

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Application Information

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IPC IPC(8): C04B33/132C04B33/13C04B33/32C03C1/00C03C8/00
CPCC04B33/1324C04B33/13C04B35/185C04B33/32C03C1/00C03C8/00C04B2235/3217C04B2235/402C04B2235/658C04B2235/656Y02P40/60
Inventor 冯建明陈建文冯琦刘庆华史兴顺
Owner 山西超牌煅烧高岭土有限公司
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