Recycling method of silicon carbide

A recycling method and silicon carbide technology, applied in the field of silicon carbide recycling, can solve problems such as low flash point and toxicity, and achieve the effects of reducing material loss, reducing material waste, and improving the overall recovery rate

Inactive Publication Date: 2011-06-01
HONG JING ENVIRONMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surfactant has the same toxicity and low flash point as the organic solvent, which wil

Method used

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  • Recycling method of silicon carbide
  • Recycling method of silicon carbide

Examples

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Effect test

Embodiment 1

[0054] One of the recovery methods of silicon carbide of the present invention

[0055] As shown in Figure 1, the silicon carbide recovery method includes a filtration step S1, a raffinate removal step S2, a pickling and impurity removal step S3, a silicon dissolution step S4, and a lye removal step S5.

[0056] 1. Filtration step S1

[0057] (1) Filtrating the silicon-containing mortar containing silicon carbide, silicon, impurities and dispersion liquid to obtain a silicon carbide / silicon mixture that initially filters out the dispersion liquid;

[0058] In more detail, the silicon-containing mortar is the cutting waste liquid for cutting silicon crystal rods, so the silicon-containing mortar contains silicon carbide, silicon and a dispersion liquid. The dispersion liquid is a commonly used cutting liquid, such as polyethylene glycol ( PEG) and other cutting fluids, silicon-containing mortar may also contain other impurities, such as debris generated by cutting tools, usually...

Embodiment 2

[0073] The recovery method two of silicon carbide of the present invention

[0074] As shown in Figure 2, the second method of recovering silicon carbide of the present invention includes filtering step S1, raffinate removal step S2, pickling and impurity removal step S3, stirring step S21, silicon dissolution step S4, and lye removal step S5.

[0075] 1. The filtering step S1 is the same as the filtering step S1 described in Example 1.

[0076] 2. The residual liquid removal step S2 is the same as the residual liquid removal step S2 described in Example 1.

[0077] 3. The pickling and impurity removal step S3 is the same as the pickling and impurity removal step S3 described in Example 1.

[0078] 4. Stirring step S21

[0079] Add the impurity-removed silicon carbide / silicon mixture into the aqueous medium of pH 2.5-14, stir evenly and then let it stand to obtain the precipitated silicon carbide / silicon mixture and the liquid medium in which silicon is suspended, and filter...

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Abstract

The invention discloses a recycling method of silicon carbide for recycling silicon carbide in silicon-containing mortar, wherein the silicon-containing mortar contains silicon carbide, silicon, impurities and dispersion. The method comprises the following steps: filtering the silicon-containing mortar to remove dispersion preliminarily and obtain silicon mud; heating silicon mud to volatilize residual dispersion and obtain silicon carbide/silicon mixture without impurities; placing the silicon carbide/silicon mixture in alkaline solution to dissolve silicon in the mixture; and removing alkaline solution with the dissolved silicon to obtain the purified silicon carbide. The invention has the following advantages: 1) the deterioration of dispersion in the silicon-containing mortar can be avoided; 2) organic solvent is not used for separating silicon carbide; and 3) the high speed centrifugation method is not required for separating silicon carbide.

Description

technical field [0001] The invention belongs to a recycling method, in particular to a silicon carbide recycling method. Background technique [0002] At present, silicon wafers have been widely used in the solar energy industry and the electronic industry, and the production of silicon wafers is usually obtained by cutting silicon crystal rods. Among them, the cutting of silicon crystal rods is usually to produce cutting mortar by cutting silicon crystal rods with cutting tools accompanied by cutting oil (such as polyethylene glycol, PEG), so that the cutting mortar usually contains silicon carbide, silicon, cutting oil And the cutting loss of cutting tools and other components. If the cutting mortar is directly discarded, it will not only cause environmental pollution, but also cause waste of raw materials. Therefore, relevant units have invested in the research and development of related technologies for the recovery of silicon carbide and silicon in cutting mortar. ...

Claims

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Application Information

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IPC IPC(8): C01B31/36
Inventor 孙玉龙刘永浩蔡明哲
Owner HONG JING ENVIRONMENT
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