真空碳热预还原-盐酸浸出钛精矿制备人造金红石的研究  

Study on the Production of Artificial Rutile From Titanium Concentrate by Vacuum Carbothermal Pre Reduction and Hydrochloric Acid Leaching

作　　者：阎鑫宇 李博 黄润[1] YAN Xinyu;LI Bo;HUANG Run

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025

出　　处：《绿色矿冶》2023年第2期24-29,共6页Sustainable Mining and Metallurgy

基　　金：贵州大学SRT项目(贵大SRT字(2022)013号)。

摘　　要：本文以钛精矿为原料进行真空碳热预还原-盐酸浸出实验,并分析真空碳热还原温度对金属失重率、金属化率、炉内压强以及Fe、Si和Mg挥发情况的影响,以及研究盐酸浸出中不同固液比、盐酸浓度、酸浸时间对人造金红石品位的影响,从而得到真空碳热预还原-盐酸浸出钛精矿制备人造金红石方法的最佳反应条件。试验结果表明,随着还原温度升高,金属化率和失重率逐渐增加,Fe、Si和Mg的挥发率逐渐增大,还原温度选择1500℃为宜;盐酸浸出最佳条件为盐酸浓度15%、固液比1∶5、酸浸时间20 min、搅拌速度120 r/min。真空碳热预还原可使钛精矿的杂质含量降低,使杂质铁还原形成细小的球状颗粒,使其比表面积大大增加,从而降低酸解的反应温度、压强和反应时间,在常压条件下采用盐酸浸出方法即可以快速还原得到高品位的人造金红石。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 20 minutes,and stirring speed of 120 r/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.

关 键 词：钛精矿 真空预处理 酸浸 人造金红石 

分 类 号：TF135[冶金工程—冶金物理化学]