Novel method for comprehensively treating waste mortar formed by processing photovoltaic cell crystalline silicon

Abstract

The invention discloses a novel method for comprehensively treating waste mortar formed by processing photovoltaic cell crystalline silicon. Aiming to different physicochemical properties of four components of the waste mortar formed by processing photovoltaic cell crystalline silicon and under the condition of ensuring that Si micropowder is not subjected to a chemical reaction, PEG (Polyethylene Glycol) and iron are separated and recovered; SiC and Si binary sand is treated by adopting various treatment methods to obtain corresponding SiC and Si series products; the SiC and Si micropowder is hydraulically sorted or sorted by air current by utilizing the granularity difference and the density difference of the SiC micropowder and the Si micropowder in the binary sand to obtain SiC micropowder and Si miropowder; the Si miropowder is washed and purified with purified water and reagent-grade inorganic acid to obtain high-purity Si miropowder; the sorted Si miropowder is fed into an electrical furnace for melting and recasting to obtain a silicon cast ingot material; the binary sand is fed into the furnace for melting and recasting to obtain a metallurgical silicon cast ingot material and a Si and SiC mixed cast ingot material; a proper amount of carbon is fed into the binary sand to react and generate SiC; and SiC, Si and Fe ternary sand is fed into the electrical furnace for melting and recasting to obtain a silicoferrite material for metallurgy.

Description

technical field [0001] The invention relates to a new method for comprehensive treatment of waste mortar from processing crystalline silicon of photovoltaic cells, and belongs to the field of comprehensive treatment of waste from processing crystalline silicon of solar photovoltaic cells. Background technique [0002] Solar energy is the only energy source for life on earth and the main energy source for future human beings. Solar cells are the most direct and convenient way to convert solar energy into electrical energy. "Silicon" is one of the most abundant materials on earth. Since scientists discovered the semiconducting properties of crystalline silicon in the 19th century, it has changed almost everything, even human thinking, in today's society. The figure and function of "silicon" can be seen everywhere in our lives. Crystalline silicon solar photovoltaic cells have become The fastest growing industry in the past, its production process can be roughly divided into f...

AI Technical Summary

Problems solved by technology

The current treatment technology can only recycle the PEG and SiC micropowder, while the most valuable Si micropowder (crystalline silicon cutting debris) is treated as waste because of the chemical reaction during the treatment process, resulting in serious waste of resources and environmental pollution.

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