Process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust

Abstract

The invention discloses a process for directly producing sponge iron by microwave carbothermal reduction of ferrous metallurgical iron-containing dust. Anthracite coal is added to the ferrous metallurgical iron-containing dust, the weight of the ferrous metallurgical iron-containing dust accounts for 20-80% of the total weight, that of the anthracite coal accounts for 10-60%, and 1-20% of calcium lime is added to be taken as an additive; an obtained mixture is pressed into a 2mm-100mm ball after mixing and drying treatment, the heating temperature is between 800 DEG C to 1300 DEG C by adopting a microwave heating mode, the mixture reacts in a microwave reducing furnace to obtain a semi-finished raw sponge ball; and the ball is crushed and ground into fine powder less than 80 meshes, and finally a sponge iron product consistent with the requirement is obtained by a magnetic separation process. The process has the advantages of having selective heating characteristic, being capable of directly heating fine materials, having rapid temperature rise, having even heating, reducing energy consumption, lowering chemical reaction activation energy, and being capable of causing atoms and molecules of the materials to generate high-speed rotation. The process does not produce any pollution, which is beneficial to the environmental protection.

Description

technical field [0001] The invention relates to a process method for producing sponge iron by carbothermally reducing ferrous metallurgical iron-containing dust, in particular to a process method for producing sponge iron by directly reducing ferrous metallurgical iron-containing dust by adopting microwave heating. Background technique [0002] During the iron and steel metallurgical production process, 2% of the raw materials added to the furnace are converted into dust. The amount of converter dust generated is about 20kg / t steel, and the amount of electric furnace dust generated is about 10-20kg / t steel. It is estimated that the annual production of dust in the US steel industry is close to 1.8 million tons, of which 600,000 tons are produced by electric furnace steelmaking, and the remaining 1.2 million tons of dust are all produced by basic oxygen furnace steelmaking. [0003] Iron and steel metallurgical dust is mainly composed of iron oxide, and the mass fraction of ...

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Problems solved by technology

In addition, because it uses external heating for reduction treatment, it causes serious secondary pollution and consumes a lot of energy.

And the production site covers a large area and the investment cost is high

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