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what is refining slag
Release time:
2021-03-22
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What is refining slag? What is the role of refining slag in steelmaking? Refining slag refers to the refined slag which, after mixing raw materials in a certain proportion and particle size, melts the raw materials into liquid state at a high temperature higher than the melting point temperature of the slag system in special equipment, and then is used in the steelmaking process after cooling and crushing. Refining slag can be divided into sintering refining slag and pre-dissolved refining slag.
The original inclusions in steel collide with the emulsified slag drops, and are adsorbed by the slag drops, and assimilate θ with the slag drops float up and remove the slag drops, the emulsified slag drops and the molten steel are strongly stirred, so that the chance of contact between the slag drops and the original inclusions in steel, especially the large grain inclusions is sharp. What is the refined slag? What is the use, because the interface tension between slag and inclusion is much smaller than the interface tension between molten steel and inclusion, according to the introduction, the wetting Angle between slag and inclusion θs-i =15° ~ 20°, wetting Angle between molten steel and inclusion θm-i =120° ~ 170 °. So the inclusion in the steel is easily absorbed by the slag droplets colliding with it.
The pre-melting type refining slag used in slag washing process (different furnace slag washing is mostly CaO-Al2O3 system, and the same furnace slag washing can be white slag or lime-fire brick slag, etc.) are all oxide melts, while most of the inclusions are also oxides, so the inclusions adsorbed by slag are easier to dissolve in the slag droplets. This melting process is called assimilation. The inclusion is assimilated by the droplet, which makes the droplet grow up and accelerates the floatation process of the droplet. It promotes the discharge of the secondary reaction products, thus making the number of inclusions in the finished steel. What is used to reduce slag washing process, emulsified slag drop surface can be used as a deoxidation reaction of new phase formation of the product core. What is the refining slag because of the free energy required to form a new phase? It is not necessary to add much, so the deoxidation reaction can be carried out under less supersaturation. At this time, the deoxidized products are easier to be assimilated by the slag drops and the attached slag drops float up together, so the number of deoxidized products remaining in the steel What is the refining slag? What is the use of significantly reduced, this is the reason for the purity of slag washing steel.
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