冶金工业废渣所配制LF炉精炼渣的脱硫试验研究

以3种冶金工业废渣为主要原料配制LF炉精炼渣,并在某钢铁厂LF炉精炼生产中进行脱硫试验,分析新配制的LF炉精炼渣在冶炼过程中的脱硫效果及其影响因素。结果表明,与原用渣相比,新配制的精炼渣在出钢过程中的平均脱硫率明显提高,其中配加铝渣后的精炼渣脱硫效果最优,出钢过程的平均脱硫率可达57.6%,平均冶炼时间缩短20.7 min;铝渣中的铝能还原渣中的FeO,降低渣的氧化性;当精炼渣的碱度（R）为2.3、渣指数（MI）值在0.28~0.5范围内以及渣中w（FeO）〈0.65%时,可使渣钢间硫的分配系数LS〉100,从而取得良好的脱硫效果。

钢绞线用钢的LF脱硫生产实践

水钢生产钢绞线用钢的铁水未进行预脱硫处理，LF脱硫负荷较重，通过分析LF炉精炼渣的组成对其脱硫能力、化学反应速度等性能的影响，确定了精炼渣的基本组成为CaO-SiO2-MgO—Al2O3渣系及其含量。在生产中，通过改进转炉挡渣、优化炉渣脱氧及吹氩、温度控制，使LF精炼脱硫率达到70％，产品中硫含量控制在0．007％的水平，保障了产品质量。

LF精炼炉热态渣回收利用的研究

本文通过对加工材品种钢连铸大包浇毕的精炼炉渣进行热态回收利用进行研究，验证回收的精炼炉渣化学性能和理化指标，满足LF炉的工艺生产要求，使回收的精炼炉渣用于品种钢生产的精炼工序，达到精炼炉渣再生循环利用，有效地降低炼钢厂品种钢的生产成本，同时减少工业固废的排放。

Experimental Study on Deep Desulfurizer in LF Process

CaO-Al2O3-SiO2-CaF2-MgO was selected as the slag system for desulfurization in LF process.The reaction between steel and slag during desulfurization has been simulated by using Factsage software to study the influence of component on the sulfur distribution ratio.In order to research the influence of CaO content,aluminum powder content and its granularity on desulfurization,laboratory experiments have been carried out in a 200 kg inductive furnace.Results showed that the optimal composition of deep desulfurizer is wCaO=64% and aluminium powder 10% with a granularity of 30 μm.Industrial trials showed that the main composition range of final slag in LF process is wCaO=53.0%-57.0%,wAl2O3=23.4%-25.1%,wSiO2=8.1%-10.0%,and wCaF2=3.2%-4.7%.The sulfur mass percent in steel is lower than 0.0008% with a desulfurization rate above 89%.According to the result of industrial production,this desulfurizer could meet the production requirement for ultra-low sulfur steel,of which sulfur mass percent is under 0.0015%