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

A technology for calcining kaolin and microcrystalline mullite, which is applied in the production of microcrystalline mullite type calcined kaolin and in the field of microcrystalline mullite type calcined kaolin, can solve the problem that the quality of calcined kaolin is poor and the high whiteness calcined kaolin cannot be applied. High-speed rail raw materials, limited applications, etc., to achieve the effect of facilitating air circulation, increasing effective space, and improving economic benefits

Active Publication Date: 2022-04-19
山西超牌煅烧高岭土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The composition of high-speed iron coal gangue raw materials (the content is calculated after calcination, the same below) is shown in the following 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) As can be seen from Table 1, Al in the raw material 2 o 3 Greater than 30%, Fe 2 o 3 Greater than 0.4%, no need to add aluminum regulator,

[0049] 2) Crushing the raw materials obtained in step 1) and grinding them to 100 mesh to obtain a mixed powder,

[0050] 3) Add water to the mixed powder and mix evenly to make a wet material. The weight ratio of the mixed powder to water is 75:25, and the water content of the wet material is 25%. The wet material is aged for 8 hours and squeezed to make The bricks are stacked on the kiln car and dried until the moisture is less than 5%. After drying, the kiln car enters the tunnel kiln for calcination. The temperature in the tunnel kiln i...

Embodiment 2

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

[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) As can be seen from Table 2, 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) Crushing the raw materials obtained in step 1), grinding them to 150 mesh to obtain a mixed powder,

[0056] 3) Add water to the mixed powder and mix evenly to make a wet material. The weight ratio of the mixed powder to water is 90:10, and the water content of the wet material is 10%. The wet material is aged for 4 hours and squeezed to make The bricks are stacked on the kiln car and dried until the moisture is less than 5%. After drying, the kiln car enters the tunnel kiln for calcination. The temperature in the tunnel kiln is below 1100°C, it is an oxidizing atmosphere, and when it is above...

Embodiment 3

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

[0059] SiO 2

al 2 o 3

Fe 2 o 3

TiO 2

other 68.8 28.5％ 1.0％ 0.9％ 0.8％

[0060] 1) As can be seen from Table 3, Al in raw materials 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) Crushing the raw materials obtained in step 1), grinding them to 150 mesh to obtain a mixed powder,

[0062] 3) Add water to the mixed powder and mix evenly to make a wet material. The weight ratio of the mixed powder to water is 80:20. The water content of the wet material is 20%. The wet material is aged for 2 hours and squeezed to make The bricks are stacked on the kiln car and dried until the moisture is less than 5%. After drying, the kiln car enters the tunnel kiln for calcination. The temperature in the tunnel kiln is below 1100°C, it is an oxidizing atmosphere, and when it is abo...

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Abstract

The invention discloses a production method of microcrystalline mullite-type calcined kaolin, the obtained microcrystalline mullite-type calcined kaolin and applications thereof. 1) Fe 2 O 3 ≥0.4% high-speed iron coal gangue as raw material, adjusted to make Al in the raw material 2 O 3 ≥30%, 2) crush the raw materials obtained in step 1), and grind them to more than 100 meshes to obtain a mixed powder, 3) add water to the mixed powder and mix evenly to make a wet material, age, squeeze the mud to make a brick, and put it in the The kiln car is dried, and after drying, the kiln car enters a tunnel kiln for calcination at 800-1350° C. to obtain the microcrystalline mullite-type calcined kaolin. The calcined kaolin product prepared by the production method of microcrystalline mullite type calcined kaolin of the present invention has high whiteness, uniform chemical composition, stable microstructure, and contains a large amount of mullite microcrystals. It is a ceramic glaze, high-quality clay brick, The raw material of choice for lightweight mullite bricks and ceramic fiber wool.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a production method of microcrystalline mullite-type calcined kaolin. In addition, the present invention also relates to a microcrystalline mullite type calcined kaolin prepared by the production method of the microcrystalline mullite type calcined kaolin and its application. Background technique [0002] my country is the largest coal-producing country in the world, and produces a large amount of coal gangue associated with coal while producing coal. For a long time, coal gangue has been dumped or buried as waste, which not only wastes resources, but also occupies land and pollutes the environment. In fact, studies have found that the main component of coal gangue produced in major coal-producing areas in my country is coal-measure kaolinite, which is a unique kaolin resource in my country, which can be used to prepare kaolin products for papermaking, ceramics, and R...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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