Optimisation of Ammonium Chloride Activated Roasting Process for Titanium-Bearing Blast Furnace Slag
The process conditions of ammonium chloride activation roasting titanium-bearing blast furnace slag were optimized by the response surface method,the effects of roasting temperature,holding time and ammonium chloride ratio on TiO2 grade and aluminum removal rate were explored,and the secondary regression equation of chlorammonia activation roasting process was established.The results show that the roasting temperature has a significant effect on the grade of TiO2 and the removal rate of aluminum,Under the optimal conditions of roasting temperature of 469 ℃,holding time of 0.97 h and ammonium chloride ratio of 41％,the model predicted TiO2 grade of 38.94％and aluminum removal rate of 91.43％,and the experimental TiO2 grade was 38.39％and the aluminum removal rate was 90.39％,which was within 1.41％of the predicted value,indicating that the optimization results of the model were reliable.
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