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.
出处
《金属矿山》
CAS
北大核心
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)
关键词
高镁铜尾矿
蛇纹石
盐酸浸出
动力学模型
High-magnesium copper tailing,Serperitine,Hydroeh]oric acid leaching,Kinetics model
