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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。
The physical and chemical phenomena of TiO_2 reduction in slag by DC electric furnace were studied. It is concluded that the reduction of TiO_2 in slag during DC silicon-smelting by Si-Fe thermal oxidation is achieved by Si-thermal reduction, Electrolytic reduction, carbothermal reduction, gravity sedimentation, Settling and melting his convection movement achieved. Under the experimental conditions, the experiments of blast furnace titanium slag electrolysis, silicon thermal method and direct current silicon thermal method for smelting silicon-cermet were carried out. The reduction rules of TiO_2 in slag were obtained under the three conditions. The experimental results show that the reduction rate, the reduction rate constant, the yield of the alloy, the recovery rate of titanium and so on of the slag in the direct current silicon-smelting process are all larger than that of the silicon thermal process.