钛铁矿盐酸加压浸出制备人造金红石试验研究  

Synthesis of Rutile by Pressure Leaching Ilmenite with Hydrochloric Acid

作　　者：崔涛[1] 彭建蓉[1] 袁野[1] 赖浚[1] 和晓才[1] 田林[1] 

机构地区：[1]昆明冶金研究院云南省选冶新技术重点实验室,云南昆明650031

出　　处：《稀有金属》2016年第12期1260-1264,共5页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51374118);云南省科研院所技术开发研究专项项目(2013DC002)资助

摘　　要：对典型钛铁矿的化学成分、物相组成和表面结构进行表征,X射线衍射(XRD)分析其结果表明,钛铁矿中主要的物相成分为FeTiO_3。根据钛铁矿的成分特点,采用还原焙烧-盐酸加压浸出法对钛铁矿进行浸出制备人造金红石,研究了预焙烧处理对于铁元素价态及浸出效果的影响。结果表明,弱氧化焙烧和还原焙烧均能够改善钛铁矿的理化性能,强化其浸出效果。最佳的预处理方式为还原焙烧,还原剂用量为8%,焙烧温度900℃,焙烧时间60 min。对于还原焙烧后的钛铁矿进行盐酸加压浸出研究,考察了浸出温度、浸出时间、盐酸浓度、液固比等因素对浸出效果的影响。盐酸加压浸出的最优条件为:浸出温度140℃,浸出时间4 h,盐酸浓度20%,液固比9∶1。此条件下得到的浸出渣煅烧所得金红石TiO_2含量可达93.45%。该工艺流程比较简单,能够有效地实现钛铁矿中杂质的分离,获得高品位的人造金红石产品。The chemical components, phase composition and surface morphology of typical ilmenite were characterized. The X-ray diffraction （XRD） results showed that the main phase of the ilmenite was FeTiO3. According to composition characteristics of the ilmenite, the rutile was synthesized by reduction roasting and hydrochloric acid pressure leaching of ilmenite. The effects of pre-roasting process on both iron valence and leaching process were studied, which showed that the physical and chemical properties and the leac- hing process of ilmenite could be improved by weak oxidizing roasting or reduction roasting, and the better pretreatment was reduction roasting with reductant amount of 8% , roasting temperature of 900℃, and roasting time of 60 min. In the research of hydrochloric acid pressure leaching of ilmenite after reduction roasting, the leaching temperature, leaching time, the concentration of HCl, liquid- solid ratio were studied. The optimal leaching conditions were as follows： leaching temperature of 140℃, leaching time of 4 h, HCl concentration of 20%, and liquid-solid ratio of 9： 1, under which the grade of rutile synthesized by calcinating the leaching slag could be 93.45%. It was proved that the process of reduction roasting and hydrochloric acid pressure leaching in ilmenite followed was an easy way to separate the impurities of ilmenite effectively with a high grade of rutile.

关 键 词：钛铁矿 还原焙烧 盐酸 加压浸出 人造金红石 

分 类 号：TF802.63[冶金工程—有色金属冶金]