China Nonferrous Metallurgy

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.