Apex slag of ladle in use for refinement of vacuum decarburization in vacuum tank

Abstract

This invention provides ladle top-slag used for vacuum decarbonization and refinery in vacuum tank. The ladle top-slag comprises: CaO 30-45 wt.%, SiO2 12-18 wt.%, Al2O3 25-35 wt.%, FeO 5-15 wt.%, MgO 3-8 wt.%, and H2O 0-0.2 wt.%. This ladle top-slag is granular mixture with granule sizes of 3-10 mm. The ladle top-slag can transfer oxygen from to steel melt, promote vacuum decarbonization without air, effectively inhibit residue overflow during decarbonization, improve the adsorption of lards in the steel melt after decarbonization, and promote desulfurization and deoxidization of the steel melt.

Description

technical field

[0001] The invention relates to a ladle top slag used for vacuum decarburization refining in a vacuum tank. Background technique

[0002] Vacuum tank vacuum refining device (VD unit) is a widely used vacuum tank refining equipment, which has good functions such as dehydrogenation, deoxidation, decarburization, denitrogenation and desulfurization, and can also remove inclusions in steel, and The morphology of inclusions in steel is controlled. Because VD does not have the function of top-blown oxygen, it cannot perform forced decarburization. Therefore, when producing low-carbon steel and ultra-low-carbon steel at home and abroad, RH (vacuum cycle degassing) devices or VOD (vacuum blowing Oxygen decarburization) device decarburizes molten steel, but the cost of the above-mentioned corresponding decarburization device is quite high. For some manufacturers who do not have these devices, it will cause production restrictions and increase production costs. [00...