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Method for preparing fine powder of silicon carbide

A technology of silicon carbide micropowder and production method, which is applied in the direction of selective deposition and solid separation, can solve the problems of material loss and affecting the production capacity of the micropowder industry, and achieve the effect of high production efficiency and narrow particle size distribution

Inactive Publication Date: 2007-04-25
夏玉策
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

my country's micro powder manufacturers are now implementing the Japanese JIS standard due to export needs, but the products can only be 1500 # , because the fine powder cannot continue to be divided down, and the loss of materials is caused, which greatly affects the production capacity of the micro powder industry

Method used

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  • Method for preparing fine powder of silicon carbide
  • Method for preparing fine powder of silicon carbide
  • Method for preparing fine powder of silicon carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] There are 6 tanks 4 with a diameter of 2.3 meters and a height of 0.8 meters. The tanks 4 are connected with each other with a conduit 2 , and the pump 3 on the conduit 2 guides the slurry 1 into the next tank 4 . Ion precipitation method is adopted; firstly, in neutral deionized water with conductivity < 100, add silicon carbide micropowder with a median diameter of 10 μ ± 0.5, the polymer dispersant is 3% of silicon carbide micropowder, and the concentration of mixed slurry 1 is 45% in turn Setting, the height of the slurry 1 in the tank 4 is 800CM, after stirring the slurry 1 for 10 minutes, get the slurry 1 at the bottom of the tank 4 (which is the sediment 5, which is the product); The fine powder of No. 1 is washed twice to achieve the product with the required fine powder particle size.

[0022] Chemical Composition Table 1

[0023]

Variety

granularity

specific gravity

chemical composition(%)

Al2O3

SiO2

FeO...

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Abstract

The invention relates to a method for producing silicon carbide powder. Wherein, it is ion deposit method which comprises that: first, in the neutral deionized water whose conductivity is lower than 100, adding 10mu+-0.5 silicon carbide powder, while the macromolecule disperser is 2-5% of silicon carbide powder, and the mixed slurry density is 40-50%, the slurry height is 800cm, the mixing time is 10min; then taking off the bottom slurry; classifying, and washing it with clean water.

Description

Technical field: [0001] The invention relates to a preparation method of abrasive-grade micropowder and superfine powder, and is mainly used for grading various powders in the field of superabrasive micropowder such as silicon carbide and corundum and silicate. Background technique: [0002] At present, the process methods for producing silicon carbide fine powder at home and abroad are mainly overflow method and sedimentation method. Regardless of the overflow method or the sedimentation method, the fine powder is first extracted from the top; each fine powder grade product needs to be added dozens of times (more than 100 tons of water resources are consumed to produce 1 ton of product), and it is repeatedly extracted. This traditional method not only consumes a lot of water, but the output is very low, and it cannot form industrialized production. At the same time, it is difficult to guarantee the product quality. [0003] See Table 1 and Table 2 for foreign standards of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D3/00
Inventor 夏玉策
Owner 夏玉策
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