How is slag produced during steel smelting?

December 12, 2018

How is slag produced during steel smelting?

During steel making, various reactions occur among the molten steel, the slag, the molten steel and the slag, between the molten steel and the furnace atmosphere, between the slag and the furnace atmosphere, between the slag and the refractory lining. Physical, chemical, and physicochemical processes carried out at high temperatures and between phases.

Slag is an important phase involved in various metallurgical reactions, and has the effect of removing impurities from the steel and protecting the molten steel. It is one of the important conditions for producing high-quality steel to keep the slag in good conditions at all stages of steelmaking.

So how is slag produced during steel smelting?

At each stage of EAF steelmaking, the molten steel surface is covered with slag, and its main sources of slag are as follows:

1) To achieve the purpose of smelting, deliberately adding slag-forming materials such as lime, limestone, silica sand, fluorspar, iron ore, carbon powder, ferrosilicon powder, refractory brick fragments, etc.

2) The products in the smelting process are mainly oxides or sulfides of various elements contained in the steel, such as FeO, MnO, SiO2, Cr2O3 , etc.

3) The refractory material in which the lining is eroded into the slag, such as MgO in the alkaline slag and SiO2 in the acid slag.

4) Impurities brought in by various raw materials.

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