Sustainable Mining and Metallurgy

In this paper, a vacuum carbothermal pre reduction hydrochloric acid leaching experiment was conducted using titanium concentrate as raw material, and the effects of vacuum carbothermal reduction temperature on metal weight loss, metallization rate, furnace pressure, and Fe, Si, and Mg volatilization were analyzed. The effects of different solid liquid ratios, hydrochloric acid concentration, and acid leaching time on the grade of synthetic rutile in hydrochloric acid leaching were studied, Thereby obtaining the optimal reaction conditions for the method of vacuum carbothermal pre reduction and hydrochloric acid leaching of titanium concentrate to prepare artificial rutile. The experimental results show that with the increase of reduction temperature, the metallization rate and weight loss rate gradually increase, and the volatilization rate of Fe, Si and Mg also gradually increase. The reduction temperature of 1500℃ is appropriate. The optimal conditions for hydrochloric acid leaching are hydrochloric acid concentration of 15%, solid liquid ratio of 1∶5, acid leaching time of 20minutes, and stirring speed of 120r/min. Vacuum carbothermal pre reduction can reduce the impurity content of titanium concentrate, reduce the impurity iron to form fine spherical particles, greatly increase its specific surface area, thereby reducing the reaction temperature, pressure, and reaction time of acid hydrolysis，so as under normal pressure conditions, acid leaching can be used to quickly reduce to obtain high-quality artificial rutile.