Method for low-cost high-quality cutting of solar-grade polycrystalline silicon chips

Abstract

The invention discloses a method for low-cost high-quality cutting of solar-grade polycrystalline silicon chips. Mortar cutting fluid prepared from 1200# recycled silicon carbide and 1500# recycled silicon carbide after mixing is used for cutting the solar-grade polycrystalline silicon chips. The 1200# recycled silicon carbide and the 1500# recycled silicon carbide are mixed in use, D50 value of silicon carbide is increased, and accordingly integral cutting capacity of the mortar cutting fluid is improved, and quality of cut solar-grade polycrystalline silicon chips is further improved; production cost is lowered as the recycled silicon carbide is adopted; inventory of the 1200# recycled silicon carbide is consumed, silicon carbide recycling can be performed stably in the long term, and the defects of shortage and quality instability of the 1500# recycled silicon carbide in the market currently are made up.

Description

technical field [0001] The invention relates to the field of solar silicon wafers, in particular to a method for cutting high-quality solar-grade polycrystalline silicon wafers at low cost. Background technique [0002] As the photovoltaic industry suffers from "double reverses" in Europe and the United States, photovoltaic slicing companies seek a way out by reducing production costs. The silicon carbide is reduced from 1200# to 1500#, and the recycling rate of silicon carbide is increased from 50% to 90%. When it is reused, the quality of 1500# silicon carbide in the cutting fluid will decrease, and the quality of the cut product (silicon wafer) will also follow. decline. In addition, the quality of 1200# recycled silicon carbide on the market is better, resulting in too large stocks of 1200# recycled silicon carbide on the market, which cannot be well utilized, and the recycling cannot be carried out stably and for a long time, while 1500# recycled silicon carbide is in ...

AI Technical Summary

Problems solved by technology

[0002] As the photovoltaic industry suffers from "double reverses" in Europe and the United States, photovoltaic slicing companies seek a way out by reducing production costs. The silicon carbide is reduced from 1200# to 1500#, and the recycling rate of silicon carbide is increased from 50% to 90%. When it is reused, the quality of 1500# silicon carbide in the cutting fluid will decrease, and the quality of the cut product (silicon wafer) will also follow. decline

In addition, the quality of 1200# recycled silicon carbide on the market is better, resulting in too large stocks of 1200# recycled silicon carbide on the market, which cannot be well utilized, and the recycling cannot be carried out stably and for a long time, while 1500# recycled silicon carbide is in short supply and the quality is not good. Stablize