Refining slag

Refining slag: The type of refining slag commonly used is mainly CaO-CaF2 based, CaO-Al2O3 based, CaO-Al2O3-SiO2 based on the chemical composition of refining slag; the form of refining slag mainly consists of sintered type, pre-melted type and Hybrid.

Sintered refining slag refers to refining slag which is used after mixing raw materials in a certain proportion and particle size, heating at a temperature lower than the melting point of the raw materials, sintering the raw materials together, and then breaking into the required particle size. The composition of the sintered refining slag is more uniform, stable, and the melting speed is faster, but the cost is relatively increased, and since the density of the sintering slag is small, there are many pores, which easily cause inhalation in the refining process.

Pre-refined refining slag refers to refining slag used for steelmaking after mixing raw materials in a certain proportion and using high temperature in a special equipment to melt the raw materials into a liquid state at a temperature higher than the melting point of the slag system, and then cooling and crushing. The pre-melted refining slag has high purity, uniform chemical composition, stable phase, low melting point and fast slag forming speed, which can greatly shorten the refining time and can be directly used for the slag washing of the converter ladle tapping process to improve the cleanliness of the molten steel. . And no fluorine or a small amount of fluorine, reducing lining erosion, effectively reducing the pollution of fluorine to the environment. Because the pre-melted refining slag has a compact structure, does not absorb water, is convenient for storage and transportation, is not powdered, and does not volatilize, can significantly reduce dust pollution of steel plants, but the production cost is high.