高炉钛矿渣直流电硅热法制取硅钛铁合金时TiO_2的还原

REDUCTION OF TITANIUM DIOXIDE IN SMELTING SILICO-TITANIUM FERROALLOY USING TITANIUM一BEARING SLAG BY D.C.SILICOTHERMIC PROCESS

研究了直流电炉作用下渣中ＴｉＯ＿２还原的物理化学现象，认为直流电硅热法冶炼硅钛铁合金时渣中ＴｉＯ＿２的还原是通过硅热还原、电解还原、碳热还原、重力沉降、金属液滴电泳沉降及熔他的对流运动达到的。在实验条件下进行了高炉钛矿渣电解、硅热法、直流电硅热法冶炼硅钦铁合金的试验，得到了三种条件下渣中ＴｉＯ＿２的还原规律。实验结果表明，直流电硅热法冶炼硅钛铁合金时渣中ＴｉＯ＿２的还原速度、还原反应速度常数、合金收得率、钛回收率等均比硅热法时大。

It is studied in this paper that the physico-chemical phenomena of TiO_2 reduction in molten slag under the influence of D.C.,and TiO_2 reduction in smelting Si-Ti ferroalloy using slag containing titania by D.C. silicothermic process is referred to due to silicothermic reduction,elec-trolysis,carbothermic reduction,gravity settling,electrophoresis of metal drops and convection in melting bath.Under the experimental conditions it is conducted to smelt Si-Ti ferroalloy using tita-nium-bearing slags from blast furnace by electrolysis,silicothermic process and D.C. silicothermic process,and TiO_2 reduction laws in slags under three conditions is achieved.It is shown that the reduction rate,reduction reaction rate constant,metal recovery and titanium recovery by D.C. sili-cothermic process is higher than that by silicothermic process.