【摘要】 攀西钛精矿电弧炉冶炼产出的酸溶性钛渣具有钛品位低及高镁低钙的特性，目前主要应用于硫酸法制备钛白粉；为延伸攀枝花钛产业结构，本文以该酸溶性钛渣为原料，采用硅热还原法进行了Ti-（55～70）wt.%Si合金制备试验，并分析了不同试验方案的渣金分离效果和影响因素，以及合金产物的微观组织结构形貌和金属元素分布规律。结果表明，在考虑合金过热度和密度条件下，Ti-60wt.%Si合金熔体渣金分离效果最好；合金组织中最主要的物相为Si相、TiSi₂相、TiFeSi₂相和Ti（Fe, Mn）Si₂相；最佳合金分离效果下，得到的实际合金成分为Ti-56.29wt.%Si-6.6wt.%Fe-0.41wt.%Mn; Ti、Fe、Si和Mn的回收率分别为：89.8%、93.5%、92.1%和94.4%。酸溶性钛渣经硅热还原后得到实际合金成分趋向于亚共晶Ti-（51.4～67.17）wt.%Si,能够为电磁定向凝固分离制备C54-TiSi₂提供原料，因此，该工艺开展能够拓展酸溶性钛渣的用途，将酸溶性钛渣的应用向钛产业链下端拓展。更多还原

【Abstract】 The acid-soluble titanium slag produced by arc furnace smelting of Panxi ilmenite concentrate has the characteristics of low titanium grade, high magnesium and low calcium. At present, it is mainly used in the preparation of titanium dioxide by sulfuric acid method. In order to extend the industrial structure of Panzhihua titanium, the preparation of Ti-（55～70） wt. % Si alloy was carried out by silicothermic reduction method with the acid-soluble titanium slag as raw material. The slag-metal separation effect and influencing factors of different test schemes were analyzed, as well as the microstructure morphology and metal element distribution of the alloy products. The results show that the slag-metal separation effect of Ti-60wt. % Si alloy melt is the best under the condition of considering alloy superheat and density. The main phases in the alloy are Si phase, TiSi₂ phase, TiFeSi₂ phase and Ti（Fe, Mn）Si₂ phase. Under the best alloy separation effect, the actual alloy composition obtained is Ti-56.29wt. % Si-6.6wt. % Fe-0.41wt. % Mn; the recovery of Ti, Fe, Si and Mn is 89.8%, 93.5%, 92.1% and 94.4%, respectively. The actual alloy composition of acid-soluble titanium slag after silicothermic reduction tends to be hypoeutectic Ti-（51.4 ～ 67.17）wt. %Si, which can provide raw materials for the preparation of C54-TiSi₂ by electromagnetic directional solidification separation. Therefore, this process can expand the use of acid-soluble titanium slag and expand the application of acid-soluble titanium slag to the lower end of the titanium industry chain.更多还原