C-SiC micro powder separating method

A technology of silicon carbide micropowder and separation method, applied in chemical instruments and methods, solid separation, wet separation, etc., can solve the problems of cumbersome operation steps, consumption, large energy, etc., and achieves cheap and easy-to-obtain raw materials, broad application prospects, The effect of the ideal separation effect

Inactive Publication Date: 2015-03-25
HENAN XINDAXIN SCI & TECH +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the separation and purification of silicon carbide mostly adopts chemical methods. For example, Chinese patent 200910065418.X proposes a method of purifying silicon carbide micropowder by pickling. This method needs to consume a large amount of acid and alkali, and the operation steps are cumbersome. In addition, The disposal and discharge of final waste liquid will also cause great environmental problems
In addition, there are literature reports on the method of removing carbon impurities in silicon carbide micropowder by high-temperature burning. On the one hand, this method consumes a lot of energy and emits a lot of greenhouse gases, which is obviously not in line with the national energy conservation policy. emission reduction policy

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  • C-SiC micro powder separating method

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Embodiment 1

[0026] A method for separating carbon-silicon carbide micropowder, specifically comprising the following steps:

[0027] (1) Measure the density of carbon in the carbon-silicon carbide powder mixture to be 2.2g / cm 3 The method for measuring the density of carbon in the carbon-silicon carbide micropowder mixture is as follows: take the carbon-silicon carbide micropowder mixture of a certain weight, first adopt the pycnometer method to record the density of the mixture, and then burn at high temperature to remove the carbon in the mixture, i.e. The content of silicon carbide and carbon can be obtained, and the density of silicon carbide is 3.2g / cm 3 Calculate, and then calculate the density of carbon;

[0028] (2) Take 10g of carbon-silicon carbide powder mixture and 100g of it with a density of 2.96g / cm 3 The liquid dispersion medium of the two, after mixing the two, fully stir, and let stand for stratification; after stratification, see figure 1 , it can be clearly seen th...

Embodiment 2

[0031] A method for separating carbon-silicon carbide micropowder, specifically comprising the following steps:

[0032] (1) Measure the density of carbon in the carbon-silicon carbide powder mixture to be 2.2g / cm 3 The method for measuring the density of carbon in the carbon-silicon carbide micropowder mixture is as follows: take the carbon-silicon carbide micropowder mixture of a certain weight, first adopt the pycnometer method to record the density of the mixture, and then burn at high temperature to remove the carbon in the mixture, i.e. The content of silicon carbide and carbon can be obtained, and the density of silicon carbide is 3.2g / cm 3 Calculate, and then calculate the density of carbon;

[0033] (2) Take 20g of carbon-silicon carbide powder mixture and 90g of it with a density of 2.96g / cm 3 The liquid dispersion medium of the two is fully stirred after the two are mixed, and left to stand for stratification; the liquid dispersion medium is carbon tetrachloride; ...

Embodiment 3

[0036] A method for separating carbon-silicon carbide micropowder, specifically comprising the following steps:

[0037] (1) Measure the density of carbon in the carbon-silicon carbide powder mixture to be 2.2g / cm 3 The method for measuring the density of carbon in the carbon-silicon carbide micropowder mixture is as follows: take the carbon-silicon carbide micropowder mixture of a certain weight, first adopt the pycnometer method to record the density of the mixture, and then burn at high temperature to remove the carbon in the mixture, i.e. The content of silicon carbide and carbon can be obtained, and the density of silicon carbide is 3.2g / cm 3 Calculate, and then calculate the density of carbon;

[0038] (2) Take 40g of carbon-silicon carbide powder mixture and 100g of it with a density of 2.6g / cm 3 The liquid dispersion medium of the two is fully stirred after the two are mixed, and left to stand for stratification; the liquid dispersion medium is tribromoethane;

[00...

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Abstract

The invention provides a C-SiC micro powder separating method which is simple and environmentally friendly. According to the method, liquid the density of which is between that of C and that of SiC serves as a dispersion medium, a C-SiC micro powder mixture is added to the dispersion medium, standing and layering are conducted after full and even dispersion, C floating on the upper layer of the liquid is removed, and then the liquid dispersion medium is filtered and recovered to obtain separated SiC micro powder. Due to the fact that no chemically active substance needing to be removed is added to the separating system, no chemical reaction occurs, and pollutant emission is avoided completely. The separating method has the advantages that technology and equipment are simple, materials are cheap and easy to obtain, cost is low, yield is high and the like and is suitable for large-scale industrial production. The separated SiC micro powder is uniform in grain size and high in purity and can be widely applied to the fields such as dissociated abrasive cutting fluids and SiC abrasive wheels.

Description

technical field [0001] The invention relates to a purification process of silicon carbide micropowder, in particular to a separation method of carbon-silicon carbide micropowder. Background technique [0002] Silicon carbide has the advantages of high hardness, high mechanical strength, stable crystal structure, strong oxidation resistance, high thermal conductivity, high chemical stability and low thermal expansion coefficient. Therefore, silicon carbide micropowder is widely used as a cutting edge material in the fields of cutting and processing of crystalline silicon wafers, and its purity has a great influence on cutting performance. Among them, carbon, as a main impurity in silicon carbide powder, has a significant impact on the physical and chemical properties and cutting performance of silicon carbide powder. Domestic and foreign companies usually use carbon content as a main indicator for quality control of silicon carbide powder. Therefore, in order to give full pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B5/30C01B31/36
Inventor 徐元清张晟卯赵俊伟申君来张孟雷韩志民高敏杰陈亚丽郭莉萍王杰王红霞尚伟
Owner HENAN XINDAXIN SCI & TECH
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