Coal-iron ore microwave reduction and electric furnace steel-making method and equipment

Abstract

The present invention is microwave reduction and electric furnace steel-making method and equipment. Certain amount of coal, iron ore and flux and mixed, set on microwave heating bed and heated to 800-1300 deg.c for 10-20 min to produce reduced iron material; and the iron material is heated in an electric arc furnace to 1400-1600 deg.c for 1-2 hr and slag-steel separated. The equipment includes microwave heating movable bed with refractory inner wall, protecting outer metal wall, microwave heater between the inner wall and the outer wall, air cooling circulator between the two walls, mixing feeder over the movable bed and high temperature discharger. The present invention has less investment, simple process, high efficiency, low power consumption and no waste exhaust and is suitable for production in different scale.

Description

(1) Technical field [0001] The invention relates to a coal-iron ore microwave reduction-electric furnace direct steelmaking method and equipment. The reduced iron produced by microwave heating is directly fed into the electric arc furnace to refine high-quality steel. method. (2) Background technology [0002] Direct reduced iron, instead of scrap steel as raw material for steelmaking, is an indispensable raw material for the production of high-quality steel and pure steel. In the next 6-8 years, the formation of scrap steel in my country will still not increase significantly, and the insufficient supply of scrap steel will not be resolved in the near future. Alleviation, my country imports more than 2 million tons of scrap steel every year, hot metal is a high-purity and high-energy raw material for electric furnace steelmaking, but the prerequisite for electric furnace heating molten iron is to have a long-term and stable source of hot metal, and environmental pollution iss...

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Problems solved by technology

[0002] Direct reduced iron, instead of scrap steel as raw material for steelmaking, is an indispensable raw material for the production of high-quality steel and pure steel. In the next 6-8 years, the formation of scrap steel in my country will still not increase significantly, and the insufficient supply of scrap steel will not be resolved in the near future. Alleviation, my country imports more than 2 million tons of scrap steel every year, hot metal is a high-purity and high-energy raw material for electric furnace steelmaking, but the prerequisite for electric furnace heating molten iron is to have a long-term and stable source of hot metal, and environmental pollution issues should be considered At present, the rotary hearth furnace method, the rotary kiln method and the shaft furnace method all have certain difficulties and unfavorable conditions in steelmaking.

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