Method for manufacturing M47 refractory material by utilizing coal gangue

A technology of refractory material and coal gangue is applied in the field of manufacturing M47 refractory material by using coal gangue to achieve the effects of improving compactness and stability, reducing labor intensity and increasing specific surface area

Active Publication Date: 2020-05-15
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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  • Method for manufacturing M47 refractory material by utilizing coal gangue
  • Method for manufacturing M47 refractory material by utilizing 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 preparing an M47 refractory material from coal gangue. The method comprises the following steps: S1, preparing raw materials, which comprise the following components in percentage by mass: 30-55% of coal gangue with a carbon content of 2-5%, 20-40% of a high-aluminum raw material, 15-30% of light calcined kaolin and 1-15% of an additive; S2, respectively grinding the raw materials to obtain ultrafine powder; and S3, mixing and stirring the ultrafine powder of raw materials to form uniform mixed powder, adding water into the mixed powder to prepare wet slurry, ageing to fully infiltrate the mixed powder with water, extruding the mixed powder into strips in vacuum, drying, preheating at 750-950 DEG C, and calcining in a rotary kiln at 1500-1600 DEG C in an oxidizing atmosphere to obtain the M47 refractory material. According to the method, coal gangue with a carbon content not larger than 5% can be directly used, micro-pores are evenly distributed inthe manufactured M47 refractory raw material, the volume density of the M47 refractory material can be reduced, and meanwhile the application performance of the M47 refractory material can be improved.

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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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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