Fluorspar (CaF 2 ) has been widely used to control the physicochemical properties of slag in steelmaking processes. However, it is very important to reduce the CaF 2 consumption because it causes various environmental problems. In the current study, therefore, the effect of industrial waste materials such as red mud (RM) and ferromanganese slag (FMS) on the desulfurization behavior of molten steel was investigated to find potential substitutes for fluorspar. Compared to conventional 10 pct CaF 2 -containing ladle slag, when excess industrial wastes were added ( i.e. , more than 10 mass pct), the composition of the slag was dramatically changed (SiO 2 increases, while Fe t O and MnO decrease). Therefore, the sulfide capacity of the slag decreased, and the viscosity of the slag increased. Thus, the desulfurization efficiency was also reduced. However, when the RM or FMS were added not more than 10 mass pct to lean-CaF 2 (3 pct) slag, the sulfide capacity of the slag was equivalent to 10 pct CaF 2 -containing ladle slag; thus, the desulfurization efficiency was also equivalent with lower melting point and higher fraction of liquid phase. Consequently, it was confirmed that a small amount (less than 10 mass pct) of industrial wastes can be added as a desulfurization fluxing agent as a partial substitute for fluorspar.

中文翻译：

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萤石和工业废料（赤泥和锰铁渣）对钢水脱硫效率的影响

萤石 (CaF 2 ) 已广泛用于控制炼钢过程中炉渣的物理化学性质。然而，减少CaF 2 的消耗是非常重要的，因为它会引起各种环境问题。因此，在目前的研究中，研究了诸如赤泥 (RM) 和锰铁渣 (FMS) 等工业废料对钢水脱硫行为的影响，以寻找萤石的潜在替代品。与传统的含 10%CaF 2 的钢包炉渣相比，当添加过量的工业废物（即超过 10% 质量 pct）时，炉渣的成分发生了显着变化（SiO 2 增加，而 Fe t O 和 MnO 减少）。因此，渣的硫化能力降低，渣的粘度增加。因此，脱硫效率也降低。但是，当向贫CaF 2 (3 pct) 炉渣中添加不超过 10 质量％的 RM 或 FMS 时，炉渣的硫化物容量相当于 10 ％ 含 CaF 2 的钢包炉渣；因此，脱硫效率也与较低的熔点和较高的液相分数相当。因此，确认可以添加少量（小于 10 质量 pct）工业废物作为脱硫助熔剂，作为萤石的部分替代品。