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为实现低碳、超低碳钢在RH中进行深脱硫且钢水不增碳,在200kg真空感应炉上对RH用低碳深脱硫预熔渣进行了脱硫试验研究,结果表明:以CaO-Al2O3-SiO2-MgO为主的低碳深脱硫预熔渣熔点低、脱硫率高,可在真空条件下将钢液中硫的质量分数由30×10-6~50×10-6脱至10×10-6~20×10-6以下,脱硫率达到55%以上,脱硫效果好,脱硫率稳定。该预熔渣中碳的质量分数小于0.05%,在脱硫过程中钢水几乎不增碳,适用于在RH中低碳、超低碳钢深脱硫。研究表明:适当地提高炉渣的光学碱度,可大大地提高其硫容量,增强炉渣的脱硫能力。使用该预熔渣处理钢水有利于钢中夹杂物的去除和细化。
In order to realize the deep desulfurization of low carbon and ultra-low carbon steel in RH and the increase of carbon in the molten steel, the desulfurization test of RH with low carbon and deep desulfurization pre-slag was carried out on a 200kg vacuum induction furnace. The results showed that: -SiO2-MgO-based low-carbon deep desulfurization pre-slag low melting point, high desulfurization rate can be under vacuum in the molten steel in the mass fraction of sulfur from 30 × 10-6 ~ 50 × 10-6 off to 10 × 10-6 ~ 20 × 10-6 the following, desulfurization rate of 55% or more, good desulfurization, desulfurization rate stability. The mass fraction of carbon in the pre-slag is less than 0.05%, and the molten steel hardly increases carbon during the desulfurization, which is suitable for deep desulfurization of low-carbon and ultra-low carbon steel in RH. The research shows that properly raising the optical basicity of slag can greatly increase its sulfur capacity and enhance its desulfurization ability. The use of the pre-slag treatment of molten steel is conducive to the removal and refining of inclusions in steel.