盐酸浸取某铜尾矿中镁的行为研究  

Magnesium Leaching Behavior from a Copper Tailing with Hydrochloric Acid

作　　者：冯雅丽[1] 杨志超[1,2] 李浩然[2] 滕青[1] 王维大[1] 周宇照[1] 

机构地区：[1]北京科技大学土木与环境工程学院 [2]中国科学院过程工程研究所生化工程国家重点实验室

出　　处：《金属矿山》2013年第9期158-162,共5页Metal Mine

基　　金：国家自然科学基金项目(编号:21176026;21176242);国家高技术研究发展计划(863计划)项目(编号:2012AA062401);"十二五"国家科技支撑计划项目(编号:2012BAB14B05;2012AA062401);国际海域资源调查与开发专项(编号:DY125-15-T-08)

摘　　要：为了高效开发利用某高镁铜尾矿中的镁,对其盐酸浸取工艺技术条件进行了研究,并建立了浸出动力学模型。研究结果表明,在盐酸浓度为1 mol/L,反应温度为353 K,液固比为3∶1,反应时间为4 h,搅拌速度为300 r/min条件下,镁浸出率可达75.55%;Avrami模型能较好地描述浸出过程。对不同条件下浸渣的XRD、SEM分析表明:当镁浸出率为75.55%时,蛇纹石结构基本全部被破坏,因而浸渣中的蛇纹石衍射峰消失;高温高压也仅能使部分钙镁榴石晶体结构不稳定,并与盐酸反应,这就是镁酸浸率难以大幅提高的原因。In order to efficiently develop and utilization of magnesium from high-magnesium copper tailings, technical conditions for the hydrochloric acid leaching process were studied, and the leaching kinetics model was established. The re- sults showed that under conditions of hydrochloric acid 1 tool/L, reaction temperature at 353 K,liquid to solid ratio of 3： 1, reaction time 4 h, stirring speed of 300 r/min,the magnesium leaching rate reached 75.55% ; Avrami model can better de- scribe the leaching process. XRD, SEM analysis of leaching residue under different conditions showed that ： when the magne- sium leaching rate is 75 %, the serpentine~ structure has been completely destroyed, thus diffraction peaks of serpentine in leaching residue disappeared ; High temperature and high pressure only makes the crystal structure of some calcium-magne- sium garnets unstable and reaction with hydrochloric acid, which is the reason for lowering the leaching rate of magnesium acid.

关 键 词：高镁铜尾矿 蛇纹石 盐酸浸出 动力学模型 

分 类 号：TQ172.621[化学工程—水泥工业]