High-purity silicon carbide recovery floatation agent and preparing method thereof

Abstract

The invention discloses a high-purity silicon carbide recovery floatation agent and a preparing method of the high-purity silicon carbide recovery floatation agent. The high-purity silicon carbide recovery floatation agent is prepared through raw materials, by weight, 2-5 parts of naphthenic acid, 2-4 parts of glycerinum, 2-3 parts of alkyl succinic acid sodium ester sulfonate, 2-3 parts of diethylene glycol dibenzoate, 3-4 parts of octaphenyl polyoxyethyiene, 40-45 parts of methyl alcohol, 30-35 parts of diesel oil, 4-5 parts of additives and 30-35 parts of water. The multiple solvents and water are used for forming a stable emulsion system under the action of surface active agents, the difference between the interfacial tension of silicon and the interfacial tension of silicon carbide is enlarged to separate the silicon and the silicon carbide, the silicon and the silicon carbide can be more thoroughly separated through the additives, and the obtained silicon carbide is higher in purity.

Description

technical field [0001] The invention relates to a powder separation technology for silicon and silicon carbide in mortar produced by a silicon wafer wire sawing process, in particular to a high-purity silicon carbide recovery flotation 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. 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] Although the benef...

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