Stainless steel dusting powder reduced pellet containing photovoltaic material and production method thereof

Abstract

The invention belongs to the technical field of metallurgy and particularly relates to a stainless steel dusting powder reduced pellet containing a photovoltaic material and a production method thereof. The photovoltaic cutting waste material and stainless steel dusting powder are mixed in a certain ratio and the mixture is pressed to obtain the reduced pellet. When stainless steel mother liquor is smelted in an electric furnace, the reduced pellet is directly added in the furnace and then returned back to the electric furnace along with scrap steel. The method has the breakthrough that chromium oxides and nickel oxides are combined with high-purity reducing metal silicon, thus the dynamical conditions for the reduction of chromium and nickel are optimized; and a lot of heat is generated when the metal silicon and silicon carbide in the stainless steel dusting powder reduced pellet are oxidized, thus slag is molten faster, the liquidity of the molten slag is improved and chromium and nickel can be reduced more easily.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a stainless steel dedusting powder reduction ball containing photovoltaic materials and a production method thereof. Background technique [0002] Solar photovoltaic power generation is regarded by the industry as the cleanest and environmentally friendly form of sustainable energy utilization, and it has developed rapidly around the world in recent years. In the past 10 years, the average annual growth rate of the global photovoltaic industry has been 41.3%, and in the past 5 years it has grown by 49.5%, keeping pace with the world. China has also rapidly emerged as a major producer of solar photovoltaic cells. In 2000, China's photovoltaic cell production was only 3 megawatts, and by the end of 2007 it had reached 1088 megawatts, ranking first in the world. To make solar cells, high-purity silicon is cast into polycrystalline silicon ingots, which are then slice...

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Problems solved by technology

[0003] The method that can achieve harmlessness and utilize its value for stainless steel dust removal is the reduction recovery method. The representative and leading direct reduction process in the world includes: Sweden ScanDustAB (SKF company) plasma process, dust removal and A mixture of reducing agents (high-quality coke) is rapidly reduced to metal oxides at high temperatures; the Inmetco direct reduction process developed by Inmetco of the United States uses carbon reduction in the annular rotary hearth furnace (RHF); Midrex of the United States and Japan's The Fasment / Fastmelt direct reduction process jointly developed by KobeSteel Company uses carbon reduction in rotary hearth furnace like Inmetco; Bureau of Mines in the United States uses electric furnace to recover valuable metals in stainless steel dust by carbon reduction to produce high-nickel-chromium alloys, and the recovery rate of chromium is relatively low. Low; in 1997, Japan’s DaidoSteel Company directly returned the dust to the steelmaking bath, and used aluminum as a reducing agent to reduce and recover valuable metals in the dust, but it was uneconomical to use aluminum