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Method for recovering silicon carbide
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A recycling method and silicon carbide technology, applied in the field of recycling, can solve problems such as toxicity and low flash point, and achieve the effects of reducing material waste, material loss, energy consumption and recycling cost.
Inactive Publication Date: 2017-06-09
周子童
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Problems solved by technology
However, the surfactant has the same toxicity and low flash point as the organic solvent, which will cause this method to have the disadvantages of environmental pollution and danger in the process.
Method used
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Embodiment 1
[0049] One of the silicon carbide recovery methods of the present invention, the silicon carbide recovery method comprises a filtration step S1, a raffinate removal step S2, and a pickling and impurity removal step
[0052] (1) Filtrating the silicon-containing mortar containing silicon carbide, silicon, impurities and dispersion to obtain a silicon carbide / silicon mixture from which the dispersion is initially filtered;
[0053]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 iron filings or other metal de...
Embodiment 2
[0068] The recovery method two of silicon carbide of the present invention
[0069] The second method of recovering silicon carbide of the present invention comprises a filtering step S1, a raffinate removal step S2, an pickling and impurity removal step S3, a stirring step S21, a silicon dissolving step S4, and a lye removal step S5.
[0070] 1. The filtering step S1 is the same as the filtering step S1 described in Example 1.
[0071] 2. The residual liquid removal step S2 is the same as the residual liquid removal step S2 described in Example 1.
[0072] 3. The pickling and impurity removal step S3 is the same as the pickling and impurity removal step S3 described in Example 1.
[0073] 4. Stirring step S21
[0074] Add the impurity-removed silicon carbide / silicon mixture into an aqueous medium with a pH of 2.5 to 14, stir evenly, and then let it stand to obtain a precipitated silicon carbide / silicon mixture and a liquid medium in which silicon is suspended. Filter the pr...
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Abstract
The invention discloses a method for recovering siliconcarbide. The method is used for recovering siliconcarbide from siliceous pulp, wherein the siliceous pulp contains siliconcarbide, silicon, impurities and a dispersion solution. The method for recovering silicon carbide from the siliceous pulp comprises the steps: filtering the siliceous pulp to preliminarily filter out the dispersion solution, so as to obtain siliceous mud; heating the siliceous mud until the remaining dispersion solution is volatilized, so as to obtain an impurity-removed silicon carbide / silicon mixture; putting the silicon carbide / silicon mixture in an alkaline solution so as to dissolve silicon in the silicon carbide / silicon mixture by the alkaline solution; and removing the silicon-dissolved alkaline solution, thereby obtaining purified silicon carbide. The method has the advantages that the deterioration of the dispersion solution in the siliceous pulp is avoided; the separation of silicon carbide by an organic solvent is avoided; and the separation of silicon carbide in a high-speed centrifugation manner is avoided.
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 performed by cutting tools with cutting oil (such as polyethylene glycol, PEG) to cut silicon crystal rods to produce cutting mortar, 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. [0003]...
Claims
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