A medicament for separating silicon and silicon carbide in mortar

Abstract

A medicament for separating silicon and silicon carbide in mortar is prepared by, by weight, kerosene 20-24 parts, n-caprylic alcohol 12-14 parts, carboxymethylcellulose 1-2 parts, terpenic oil 4-5 parts, ethionine ester 1-2 parts, diisopropyl naphthalene sulfonic acid 3-4 parts, mercaptobenzothiazole 2-4 parts, methyl alcohol 30-35 parts, diesel oil 40-45 parts, assistant 4-5 parts and water 25-30 parts. The medicament adopts multiple solvents, a flotation reagent and water which form a stable emulsification system under the effect of a surface active agent, the interfacial tensions of the silicon and the silicon carbide are changed, and accordingly the silicon and the silicon carbide are separated. By using the assistant, the silicon and the silicon carbide can be separated thoroughly, the obtained silicon carbide is high in purity and is superior to the standard required by production of a silicon carbide micro powder raw material, and the economic benefit of enterprises is improved greatly.

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 medicament for separating silicon and silicon carbide in mortar 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. 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 materials. [0003] Althou...

AI Technical Summary

Problems solved by technology

[0003] 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