Method for reducing ferrophosphorus in furnace slag generated in electric furnace method yellow phosphorus production

Abstract

The invention discloses a method for reducing ferrophosphorus in furnace slag generated in electric furnace method yellow phosphorus production. During the process of electric furnace method yellow phosphorus production, solid wastes (silicon slag), which are generated during the industrial silicon production process and are rich in elemental silicon, are added; elemental silicon in the silicon slag reacts with ferrophosphorus at a high temperature to generate a more stable product (ferrosilicon), elemental phosphorus is released; the content of ferrophosphorus in furnace slag is reduced; thephosphorus yield of the electric furnace method yellow phosphorus production is increased; the energy consumption for each unit of phosphorus products is reduced; and the profits for enterprises are increased finally.

Description

technical field [0001] The invention relates to a method for reducing ferrophosphorus in the slag of yellow phosphorus produced by an electric furnace method, and belongs to the technical field of resource comprehensive utilization and energy saving and emission reduction. Background technique [0002] The raw materials for the production of yellow phosphorus by the electric furnace method are: phosphate rock, coke (white coal), and silica. Coke (white coal) is both a reducing agent and a conductor in the production of yellow phosphorus by the electric furnace method; silica is a flux used to reduce slag Melting point, easy to slag. The main chemical composition of phosphate rock is calcium fluorophosphate, whose general formula is Ca 5 F(PO 4 ) 3 . The grade of phosphate rock (in P 2 o 5 content), the requirement is generally to contain P 2 o 5 ≥28%, Fe 2 o 3 <1.5%, CO 2 <5%, (the above indicators are calculated on a dry basis, the same below). When phosph...

AI Technical Summary

Problems solved by technology

At present, the supply of ferrophosphorus exceeds demand, and its market price is less than 2,000 yuan / ton

Summarizing the existing research, silicon slag is used as raw material for the production of yellow phosphorus by electric furnace method, and the characteristics of silicon slag rich in elemental silicon are used to produce more stable ferrosilicon by reacting with ferrophosphorus at high temperature, thereby replacing elemental phosphorus. There is no report on improving the yield of phosphorus produced by electric furnace yellow phosphorus

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