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The method of making m47 refractory material from coal gangue

A technology of refractory materials and coal gangue, which is applied in the field of manufacturing M47 refractory materials using coal gangue, to achieve the effects of improving compactness and stability, increasing specific surface area, and reducing manufacturing costs

Active Publication Date: 2022-04-19
内蒙古超牌新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for manufacturing M47 refractory materials by using coal gangue to solve the technical problem that coal gangue with high carbon content cannot be directly used to prepare M47 refractory materials

Method used

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  • The method of making m47 refractory material from coal gangue
  • The method of making m47 refractory material from coal gangue

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The coal gangue composition used in this embodiment is shown in Table 1 below, in terms of mass percentage, and the numerical value is an uncalcined composition analysis:

[0049] Element SiO 2

al 2 o 3

Fe 2 o 3

TiO 2

CaO MgO K 2 o

Na 2 o

Loss on ignition content 41.78 37.10 0.53 1.56 0.48 0.06 0.16 0.13 16.18

[0050] Al in the above coal gangue 2 o 3 The content is 43.69% (after calcination), and the C content is 2.4%.

[0051] In lightly burned kaolin, Al 2 o 3 The content is 42%, the loss on ignition is 4%, the carbon content is 0.1%, and the particle size is 1000 mesh.

[0052] The preparation method comprises the following steps:

[0053] 1) the above-mentioned coal gangue is ground into a fine powder with a fineness of 600 meshes, and the Al 2 o 3 The Hequ high bauxite raw material with a content of 58% (the C content is not more than 0.5%) is ground into a fine powder with a finenes...

Embodiment 2

[0056] The coal gangue composition used in this embodiment is shown in the following table 2, in terms of mass percentage, and the value is an uncalcined composition analysis:

[0057] Element SiO 2

Al 2 o 3

Fe 2 o 3

TiO 2

CaO MgO K 2 o

Na 2 o

Loss on ignition content 41.18 35.2 0.57 1.03 1.48 2.18 0.24 0.05 18.29

[0058] Al in the above coal gangue 2 o 3 The content is 43% (after calcination), and the C content is 4.15%.

[0059] In lightly burned kaolin, Al 2 o3 The content is 43.08%, the loss on ignition is 3%, the carbon content is 0.4%, and the particle size is 2000 mesh.

[0060] The preparation method comprises the following steps:

[0061] 1) The above-mentioned coal gangue is ground into a fine powder with a fineness of 1000 meshes, and Yangquan secondary high alumina bauxite (Al 2 o 3 content is 65%) to be ground into a fine powder with a fineness of 400 mesh; the purple wood knot is gro...

Embodiment 3

[0064] The coal gangue composition used in this embodiment is shown in the following table 3, in terms of mass percentage, and the value is an uncalcined composition analysis:

[0065] Element SiO 2

Al 2 o 3

Fe 2 o 3

TiO 2

CaO MgO K 2 o

Na 2 o

Loss on ignition content 40.49 34.25 0.54 1.23 4.47 0.21 0.27 0.17 19.21

[0066] Al in the above coal gangue 2 o 3 The content is 41% (after calcination), and the C content is 5%.

[0067] In lightly burned kaolin, Al 2 o 3 The content is 42.39%, the loss on ignition is 3%, the carbon content is 0.4%, and the particle size is 2000 mesh.

[0068] The preparation method comprises the following steps:

[0069] 1) The above-mentioned coal gangue is ground into a fine powder with a fineness of 800 meshes, and Xiaoyi first-grade high-alumina bauxite (Al 2 o 3 content is 68%) and ground into a fine powder with a fineness of 325 meshes; the purple wood knot is grou...

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Abstract

The invention discloses a method for manufacturing M47 refractory materials by using coal gangue, which includes the following steps: S1. Prepare raw materials, in terms of mass percentage, the raw materials include 30-55% of coal gangue with a carbon content of 2-5%, and 20% of high-alumina raw materials ~40%, light-burned kaolin 15~30% and admixture 1~15%; S2, grind the raw materials separately to obtain ultrafine powder; S3, mix the ultrafine powder raw materials to form a uniform mixed powder, Add water to the mixed powder to make a wet slurry and age to make the mixed powder and water fully infiltrated, then vacuum squeeze the mud to make strips, after drying, preheat at 750-950°C, enter the rotary kiln for calcination in an oxidizing atmosphere , the calcination temperature is 1500-1600°C, and the M47 refractory material is obtained. The method of the present invention can directly use coal gangue with a C content of not more than 5%, and the manufactured M47 refractory material has evenly distributed micropores inside, which can reduce the volume density of the M47 refractory material and improve the application performance of the M47 refractory material .

Description

technical field [0001] The invention relates to the technical field of preparation of refractory materials, in particular to a method for manufacturing M47 refractory materials from coal gangue. Background technique [0002] Mullite is a high-quality refractory material, which is an aluminosilicate mineral and is Al 2 o 3 -SiO 2 The only stable compound in the series. Mullite has a low coefficient of thermal expansion (20 ~ 200 ° C, 4 × 10 -6 K -1 ), good thermal shock resistance, chemical corrosion resistance, creep resistance, high load softening temperature, good volume stability, strong electrical insulation wire, etc., is an ideal high-grade refractory material, which is widely used in metallurgy, glass, ceramics, Chemical, electric power, national defense, gas, cement and other industries. [0003] M47 is Al 2 o 3 Mullite with a content of 46-49% is required to use M47 refractory raw materials for the back fire surface of steelmaking blast furnaces, hot blast f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/185
CPCC04B35/66C04B35/62204C04B35/185C04B2235/349C04B2235/3217C04B2235/77C04B2235/9646
Inventor 周丽冯建明张智陈建文高永涛冯英王宇轩刘松柏
Owner 内蒙古超牌新材料股份有限公司
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