A kind of silicon carbide flotation agent

Abstract

The invention relates to a silicon carbide flotation agent which is prepared by, by weight, 40-42 parts of diesel oil, 3-4 parts of sodium dodecyl benzene sulfonate, 2-5 parts of sodium napthionate, 12-15 parts of kerosene, 2-3 parts of petroleum sodium sulfonate, 3-4 parts of sodium pyrosulfite, 2-3 parts of alkylphenol ethoxylates, 40-50 parts of methyl alcohol, 30-35 parts of ethyl alcohol, 4-5 parts of assistants and 30-35 parts of water. According to the silicon carbide flotation agent, of the multiple solvents, the flotation reagents and the water are used, a stable emulsification system is formed under the effect of a surface active agent, interfacial tension differences between silicon and silicon carbide are increased, and the silicon and the silicon carbide are separated; after the silicon carbide flotation agent is used, the silicon and the silicon carbide can be thoroughly separated, and therefore obtained silicon carbide powder is high in purity. The silicon carbide micro powder recovered with the silicon carbide flotation agent has the same or similar performance indexes of brand new silicon carbide micro powder, the using efficiency of raw materials is improved to the maximum degree, and pollution of waste mortar discharging to the environment is avoided.

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 saw process, in particular to a silicon carbide flotation agent and a preparation method thereof. Background technique [0002] All kinds of silicon wafers, including monocrystalline silicon and polycrystalline silicon solar cells, and silicon wafers used in the microelectronics industry, are generally produced by cutting with wire saws and silicon carbide abrasive slurry. The thickness of the silicon wafer is generally 0.22mm, and there is no development trend of thinning. The width of the wire saw slit is generally 0.18-0.30mm, which means that 20-60% of the high-purity silicon material will become sawdust and enter the mortar. Recycling is tantamount to opening up a new source of high-purity silicon on a considerable scale. [0003] Although the benefits of recycling high-purity silicon are considerable, the physical ...

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