镁质低品位铁镍硫化矿的活化工艺及机理  

The activation process and mechanism of magnesium low grade iron nickel sulfide ore

作　　者：刘欣伟[1,2] 胡文韬[2] 李浩然[1] 冯雅丽[2] 杨志超[2] 

机构地区：[1]中国科学院过程工程研究所生化工程国家重点实验室,北京100190 [2]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《哈尔滨工程大学学报》2015年第2期175-180,共6页Journal of Harbin Engineering University

基　　金：国家自然科学基金资助项目(51304012);中国博士后科学基金资助项目(2013M530529;2014M550845);钢铁冶金新技术国家重点实验室开放基金资助项目(KF 13-05)

摘　　要：细菌浸出是镁质低品位铁镍硫化矿的潜在处理方案之一。针对该矿石浸出活性较低的问题,研究了硫酸预浸出和硫酸铵焙烧预浸出2种活化方案,并与细菌直接浸出(空白试验)做了比较。结果表明,2种活化方案都有利于金属回收,但硫酸铵焙烧预浸出方案的活化效果更优:浸出时间为8 d时,Ni、Cu和Mg的浸出率分别为90.2%、89.56%和61.19%,分别高于硫酸预浸出方案2.08%、12.2%和8.95%。矿石中的Mg主要在硫酸铵焙烧预浸出阶段进入溶液,细菌对Mg浸出的影响不大。XRD和能谱分析表明:浸出渣中Ni和Cu的残留量很低,Mg主要存在于难浸出的蛇纹石之中。Bacterial leaching is one of the potential treatment schemes to deal with the magnesium low-grade iron nickel sulfide ore. In this paper, according to the low leaching activity of the ore, two kinds of activation schemes： sulfuric acid pre-leaching and ammonium sulfate roasting pre-leaehing were studied and compared with the bacterial direct leaching program, i.e. blank test. The results showed that the two kinds of activation schemes are both beneficial to metal recycling. However, the ammonium sulfate roasting pre-leaching activation scheme is better. When the leaching time is 8 days, the leaching rates of Ni, Cu and Mg are 90.2%, 89.56% and 61.19% and higher than the sulfuric acid pre-leaching scheme of 2.08%, 12.2% and 8.95%, respectively. Mg in the ore is mainly leached out in the ammonium sulfate roasting pre-leaching stage and the bacterial leaching has little effect on Mg leaching process. The XRD and EDS energy spectrum analysis results showed that ： only a small amount of Ni and Cu is remained in the slag residual and the remaining magnesium mainly exists in the form of serpentine that is hard to be leached.

关 键 词：硫酸铵焙烧 A.ferrooxidans菌 浸出活性 氧化还原电位 

分 类 号：TD952[矿业工程—选矿]