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Preparation method of Si3N4-SiC-C fire-resistant material powder

A technology of si3n4-sic-c and refractory raw materials, which is applied in the field of preparing Si3N4-SiC-C refractory raw materials, can solve the problems of high price, complicated preparation process and large power consumption, and achieves low cost, simple equipment and energy consumption. less effect

Inactive Publication Date: 2010-06-16
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon nitride combined with silicon carbide brick is a new type of refractory product developed based on the excellent properties of silicon nitride and silicon carbide materials. There are many shortcomings such as strength reduction caused by grain growth and other reasons.
Silicon nitride combined with silicon carbide has many excellent properties, but its preparation process is relatively complicated, the raw material is expensive, the nitriding reaction process is difficult to control, the power consumption is large, and the price is high, which has increased the aluminum electrolysis industry. cost, which is not conducive to improving the competitiveness of the industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Raw materials and ratio:

[0019] The addition of quartz powder is 71.4wt%, of which SiO 2 The content percentage is 98.0%, and the average particle size is less than 0.074mm; the coke powder addition is 28.6wt%, and the C content percentage is 90.0%, and the average particle size is less than 0.150mm. The addition amount of the external binder (silica sol) is 2-3% of the total batching mass.

[0020] Ingredients, mix:

[0021] First, various raw materials are loaded into a mixer according to the above proportions, and dry ball milled for 10 hours to fully mix the raw materials evenly, the particle size is less than 0.150mm, and the sieve residue of the aperture is less than 2.0wt%.

[0022] Shaped or balled:

[0023] Put the raw materials mixed by ball mill into the mixer, add appropriate amount of water and mix them, and then shape the materials into green bodies on the molding machine (or shape them into spherical particles with a ball forming machine).

[0024] ...

Embodiment 2

[0030] Raw materials and ratio:

[0031] The amount of silica fume added is 62.5wt%, of which SiO 2 The content percentage is 92.0%, and the average particle size is less than 0.074mm; the addition amount of graphite electrode powder is 37.5wt%, and the C content percentage is 90.0%, and the average particle size is less than 0.150mm. The addition amount of the external binding agent (polyvinyl alcohol) is 2-3% of the total batching quality.

[0032] Ingredients, mix:

[0033] Firstly, various raw materials are loaded into a mixer according to the above ratio, and dry ball milled for 8 hours to fully mix the raw materials evenly, the particle size is less than 0.150mm, and the sieve residue of the aperture is less than 2.0wt%.

[0034] Shaped or balled:

[0035] Put the raw materials mixed by ball mill into the mixer, add appropriate amount of water and mix them, and then shape the materials into green bodies in the molding machine (or shape them into spherical particles wi...

Embodiment 3

[0042] Raw materials and ratio:

[0043] The amount of silica fume added is 32.5wt%, of which SiO 2 The content percentage is 92.0%, and the average particle size is less than 0.074mm; the addition of quartz powder is 31.4wt%, of which SiO 2 The content percentage is 98.0%, and the average particle size is less than 0.074mm; the addition amount of coke powder is 18.6wt%, and the C content percentage is 90.0%, and the average particle size is less than 0.150mm. The addition amount of graphite electrode powder is 17.5wt%, wherein the percentage of C content is 90.0%, and the average particle size is less than 0.150mm. The addition amount of the external binding agent (polyvinyl alcohol) is 2-3% of the total batching quality.

[0044] Ingredients, mix:

[0045] First, various raw materials are loaded into a mixer according to the above proportions, and dry ball milled for 12 hours to fully mix the raw materials evenly, the particle size is less than 0.100mm, and the sieve resi...

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Abstract

The invention relates to a preparation method of Si3N4-SiC-C fire-resistant material powder, belonging to the technical field of fire-resistant material preparation. The preparation method is characterized by comprising the following steps of: reducing nitrided natural quartz by coke dust and graphite or carbon black in a carbothermal way in a proper high-temperature environment and a nitrogen atmosphere to prepare an Si3N4-SiC-C high-temperature resistant material; and preparing the Si3N4-SiC-C fire-resistant material powder which can be used for fire-resistant products, i.e. side wall bricks of an aluminium cell and the like, through processes, i.e. crushing, grinding, levigating, and the like. The Si3N4-SiC-C fire-resistant material mainly comprises the following components: alpha-Si3N4, beta-Si3N4, alpha-SiC, beta-SiC, a small amount of C and Si2N2O, and the like. The novel preparation method of the Si3N4-SiC-C fire-resistant material powder has the outstanding advantages of simple equipment, low cost, little energy consumption of the preparation process, convenient large-scaled production, and the like, and also provides a new technological approach for the efficient appreciation utilization of the natural quartz.

Description

technical field [0001] The invention relates to a method for preparing Si 3 N 4 -New method of SiC-C refractory material, this Si 3 N 4 -The powder of SiC-C refractory raw material is mainly used to prepare aluminum electrolytic tank side wall refractory materials and other Si-containing materials in the electrolytic aluminum industry 3 N 4 -SiC-C refractory material, belonging to the technical field of refractory material preparation. Background technique [0002] With the rapid development of my country's national economy, my country's electrolytic aluminum industry has made great progress. At present, my country's annual output of electrolytic aluminum has reached 15 million tons, ranking first in the world and becoming a major country in the world's aluminum industry. The main method of producing metal aluminum in industry today is the cryolite-alumina molten salt electrolysis method, and the main equipment for electrolytic aluminum smelting is aluminum electrolytic...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/565C04B35/584
Inventor 黄朝晖陈凯房明浩刘艳改徐友果
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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