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为充分利用我国的含砷铁矿资源,必须解决铁水中含砷含硫偏高的问题。本文是采用CaO-CaF_2和CaC_2-CaF_2渣系作为脱砷剂,对铁水的脱砷脱硫进行了研究。实验是在钼丝炉中进行的,在石墨坩埚中,用50wt％CaO-CaF_2渣系,吹Ar搅拌的方法处理含砷铁水,获得了53％脱砷率和大于90％的脱硫率。用50wt％CaC_2-CaF_2渣系机械搅拌的方法处理含砷铁水,获得了80％的脱砷率和98％的脱硫率。并研究了各工艺因素对脱砷的影响,确定了最佳脱砷条件。应用热力学理论解释了CaO-CaF_2,CaC_2-CaF_2渣系对铁水的脱砷过程是还原脱砷过程和磷不能被脱除的原因。通过分析、计算说明了铁水中砷、磷、硫在热力学行为上的差异。
In order to make full use of the arsenic resources in our country, we must solve the problem of high sulfur content of arsenic in hot metal. In this paper, CaO-CaF_2 and CaC_2-CaF_2 slag systems were used as arsenic removal reagents to study arsenic removal and desulfurization of hot metal. The experiments were carried out in a molybdenum wire furnace. The arsenic-containing hot metal was treated with a 50 wt% CaO-CaF 2 slag system and stirred with Ar by stirring in a graphite crucible to obtain a 53% de-arsenic rate and a desulfurization rate of more than 90%. The arsenic-containing hot metal was treated with 50wt% CaC_2-CaF_2 slag system with mechanical stirring, and the desaturation rate of 80% and desulfurization rate of 98% were obtained. The effects of various process factors on arsenic removal were studied, and the optimum conditions for removing arsenic were determined. The thermodynamics theory is used to explain that the arsenic removal process of CaO-CaF_2, CaC_2-CaF_2 slag system is to reduce arsenic removal process and phosphorus can not be removed. Through the analysis and calculation, the differences in the thermodynamic behavior of arsenic, phosphorus and sulfur in hot metal were illustrated.