Production method for smelting ferrosilicon by utilizing crystalline silicon cutting waste powder

Abstract

The invention discloses a production method for smelting ferrosilicon by utilizing crystalline silicon cutting waste powder. The production method is characterized in that the crystalline silicon cutting waste powder can be directly molten into a ferrosilicon component under a high-temperature melting state by utilizing the matter characteristic that the high-purity simple substance silicon in the crystalline silicon cutting waste powder is a silicon component in ferrosilicon; unit power consumption and coke consumption of smelting the ferrosilicon can be greatly reduced by reducing silicon dioxide in silica raw materials through strong reduction characteristic of silicon carbide and releasing a great deal of reaction heat; equipment investment is not required to be increased, so that in case of current equipment, crystalline silicon cutting waste powder (namely powder tailings) can be recycled on a large scale for being added into furnace burden for smelting production of a ferrosilicon product, and therefore, a silicon resource raw material treasury with high energy storage property and strong reducing property is developed for producing and smelting the ferrosilicon product in the metallurgical industry, the environmental pollution problem caused by stocking and stacking the cutting waste powder for a long time in the crystalline silicon slicing industry can be effectively solved, and remarkable social environment-friendly effect and great economic benefits are achieved.

Description

technical field

[0001] The invention relates to a production method for smelting ferrosilicon by using crystalline silicon cutting waste powder, and belongs to the production technical field of recycling waste crystalline silicon slicing to smelt ferrosilicon products. Background technique

[0002] With the rapid development of the global solar photovoltaic industry, the market demand for crystalline silicon products (including polycrystalline silicon and monocrystalline silicon) is increasing day by day, and the processing scale of the crystalline silicon slicing industry is also increasing. So far, in my country's current crystalline silicon slicing industry, most of them adopt the relatively mature "wire cutting" slicing process. The mortar mixed with silicon carbide powder is sent to the cutting area to cut the crystalline silicon ingot to complete the slicing operation. During the slicing process, a large amount of silicon powder (accounting for about 20%-40% of the wei...