Thermodynamic Calculation and Experimental Study on the Recovery of Valuable Metal Elements from Titania-Bearing Blast-Furnace Slag by Silicothermic Reduction
ducts experimental research on the silicon-thermal preparation of high-silicon Ti-Si alloy.The experiment first calculates the thermodynamic conditions of silicon-thermal reduction of valuable metal oxides in high-tita-nium blast-furnace slag from a thermodynamic perspective.Ingredient calculations for silicon-thermal reduc-tion are then carried out from the perspectives of regulating the composition of the alloy after reduction and effi-ciently separating slag and metal.Based on the thermodynamic and ingredient calculation results,experimental re-search on silicon-thermal reduction of high-titanium blast-furnace slag is conducted in a high-temperature box-type resistance furnace,exploring the effects of different insulation times on slag-metal separation and the phase composition of the alloy after reduction.The research findings reveal that at 1 600℃,the high-titanium blast-furnace slag can achieve a good slag-metal separation effect after a 2-hour silicon-thermal reduction.The main phases in the alloy obtained after slag-metal separation are Si,TiSi2,TiFeSi2 and TiMnSi2.However,the microscopic organizational structure reveals that the TiMnSi2 phase does not exist independently but forms a ternary solid solution with TiFeSi2 and TiSi2.
titania-bearing blast-furnacesilicothermic reductionvaluable metal recoveryalloy composition control
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万方数据
维普
