Refining Slag

What is refining slag?

Refining slag refers to the technology used after mixing raw materials in a certain proportion and particle size, heating them below the melting point of the raw materials, sintering the raw materials together, and then crushing them into particle sizes. The main components are CaO-CaF2 base, CaO-Al2O3 base, and CaO-Al2O3-SiO2 base.

Pre-melted Refining Slag
Pre-melted Refining Slag
Sintered Refining Slag
Sintered Refining Slag
Compound Refining Slag
Compound Refining Slag


The form of refining slag mainly includes

  • Sintered Refining Slag
  • Pre-melted Refining Slag
  • Mixed Refining Slag


Refining slag properties

The main components of refining slag are calcium aluminate, alumina, silicon oxide, calcium fluoride, magnesium oxide, etc. These metal ions are combined into calcium oxide-calcium fluoride base, calcium oxide-alumina base, calcium oxide-alumina- Silicon oxide base; The formed composite material is the refining slag. Refining slag is a necessary additive for deoxidation and desulfurization in the refining process of iron and steel enterprises.

Characteristics of refined slag

Refining slag has the advantages of uniform chemical composition, low melting point, fast melting speed, reduced refining power consumption, and shortened refining time. It has attracted more and more attention from iron and steel enterprises and is currently one of the more important steelmaking additives.

The Usage of Refining Slag

Put the refining slag into the ladle before tapping, because the molten steel flows into the ladle from the upper layer, the molten steel and the refining slag are vigorously stirred, and the refining slag is quickly melted into the molten steel, and then aggregates and floats. Because of the strong reducibility of the refining slag, it has a strong deoxidation and desulfurization ability, which can remove oxygen and sulfur impurities in the molten steel during the mixing process of molten steel. At present, the desulfurization capacity of refined slag can reach more than 85%, which is a very good steelmaking additive.

Specifications Of Refining Slag

CaO A2LO3 SiO2 Fe2O3 MgO S P TiO2
47-52 38-42 ≤2.5 ≤1.0 1.0 0.1 0.05 ≤1
45-50 37-45 5-2 ≤1.5 3-5 0.1 0.05 ≤1
47-55 50-55 6-8 ≤1.5 1.0 0.1 0.05 ≤1
30-35 50-55 ≤2.0 ≤0.1 ≤0.1
≥50 ≥30 ≤1.5 ≤0.1 ≤0.1 0.15

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