Silicon carbide micro-powder recycling agent and preparation method thereof

Abstract

A silicon carbide micro-powder recycling agent is made of raw materials including, by weight, 30-34 parts of diesel, 4-6 parts of diltiazem nitrile ester, 4-5 parts of isopropyl ethyl ammonium sulfate ester, 2-3 parts of phenethyl cumenyl phenol polyoxyethylene ether, 1-3 parts of benzoquinone dioxime, 3-5 parts of tall oleic acid, 1-2 parts of benzoxazole sulfur alcohol, 30-35 parts of methanol, 4-5 parts of auxiliaries and 35-40 parts of water. By the aid of various solvents and water, a stable emulsion system is formed under the action of surfactants, interfacial tension of silicon and silicon carbide is changed, the silicon is more thoroughly separated from the silicon carbide by the aid of the auxiliaries, and the obtained silicon carbide is higher in purity. Silicon carbide micro-powder is efficiently recycled at low cost, and the economic benefit of enterprises is greatly improved.

Description

technical field [0001] The invention relates to the technical field of powder separation of silicon and silicon carbide in mortar produced by a silicon wafer wire sawing process, in particular to a silicon carbide micropowder recovery agent and a preparation method thereof. Background technique [0002] Various silicon wafers, including monocrystalline silicon and polycrystalline silicon solar cells, and silicon wafers for the microelectronics industry, are generally produced by cutting with wire saws and silicon carbide abrasive slurry, referred to as mortar. [0003] The thickness of the silicon wafer is generally 0.22mm, and there is no development trend of thinning at present. The width of the wire saw kerf is generally 0.18-0.30mm, which means that 20-60% of the high-purity silicon material will enter the mortar as sawdust, and its extraction Recycling is equivalent to opening up a new and sizable source of high-purity silicon raw material. [0004] Although th...

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Problems solved by technology

[0004] Although the benefits of recovering high-purity silicon are considerable, the physical and chemical properties of silicon and silicon carbide are relatively close. So far, there are few research results on this project, and there are no successful cases of actual production. Further research is needed on feasible methods for actual production. Separation agents and methods