用渣洗替代钢包精炼炉脱硫的工艺优化试验研究

An Experimental Study of Process Optimization for Desulfurization with Slag-washing Alternative LF Refining

为简化船板钢生产工序,减少钢水精炼时间以控制生产节奏,进行渣洗脱硫替代钢包精炼炉(LF)脱硫的工艺改进试验。分析转炉终渣氧化性、终点碳含量及钢包底吹氩流量等参数对渣洗过程中脱硫率的影响。结果表明:终渣FeO质量分数大于25%时,脱硫率在20%以下;终点碳质量分数低于0.06%时,由于钢水氧化性强,钢水脱硫率低于20%,需将转炉终点碳质量分数控制在0.1%以上;增大氩气流量能提高脱硫率,但当流量超过0.5 m^3/min,效果不再明显。该研究为用渣洗脱硫取代LF炉脱硫工序提供了依据。

In order to simplify the production process of ship plate steel, and reduce molten steel refining time to control the production pace, process improvement test, which used steel slag washing desulfurization substitution to ladle furnace（LF） desulfurization, was carried on. The influence of the oxidation of slag, the end point carbon content and the flow rate of argon gas flow on desulfurization rate in the slag washing process were analyzed. The results show that the desulfurization rate is below 20% when the final slag FeO mass fraction is greater than 25%;When the mass fraction of the end point carbon is less than 0.06%, due to the strong oxidation of the steel and the desulfurization rate of the steel is less than 20%, the mass fraction in the end point carbon can be controlled more than 0.1%; Increasing the flow rate of argon can increase the desulfurization rate, but the effect is not obvious when the flow rate is over 0.5 m3/min. This result provides the basis for steel slag-washing desulfurization process replaced by LF furnace desulfurization process.