离子交换法分离高镁低镍硫化矿生物浸出液中的镍镁  

Separation of Ni and Mg from Bioleaching Solution of High Grade Mg and Low Grade Ni-Bearing Sulfide Ore by Ion Exchange

作　　者：谢刚[1] 温建康[1] 刘学[1] 武彪[1] 

机构地区：[1]北京有色金属研究总院生物冶金国家工程实验室,北京100088

出　　处：《稀有金属》2014年第5期855-860,共6页Chinese Journal of Rare Metals

基　　金：国家科技部重点基础研究发展计划项目(2010CB630906);国家科技部高技术研究发展计划项目(2012AA061502)资助

摘　　要：高镁低镍硫化矿细菌浸出液中有价金属镍离子浓度为300 mg·L^-1左右,杂质金属镁离子浓度高达10～20 g·L^-1,过高的镁离子浓度使细菌大量死亡,浸出无法继续,且常规方法难以对镍离子进行提取。本文采用离子交换树脂CN-27对浸出液进行吸附,镍镁吸附比例约为1∶10,小于原液中的镍镁比例1∶50。利用不同浓度硫酸溶液进行树脂解吸,当硫酸浓度为9 g·L^-1时,镁离子首先从树脂上洗脱下来,而镍离子几乎不被洗脱;当硫酸浓度为36 g·L^-1时,镍离子开始从树脂上洗脱下来。实验测得该条件下树脂对镍离子的穿透交换容量为0.487mmol·g-1（0.613 mmol·ml-1）。用较高浓度的硫酸对吸附在离子交换树脂上的镍离子进行解吸,其流出液中镍离子平均浓度为4.84 g·L^-1,富集比在8倍以上,镍离子的解吸率达到97.47%。The concentration of Ni2 ＋ in the bioleaching solution of low-grade nickel-bearing sulfide ore containing high magnesium was about 300 mg·L^-1,and the concentration of Mg^2＋was 10 ～ 20 g·L^-1. The high concentration of Mg^2＋could kill the bacteria and make the bioleaching hard to continue. The ion-exchange resin CN-27 was used for the separation of nickel and magnesium in this paper. The adsorption ratio of Ni2 ＋to Mg^2＋was 1∶ 10,which was smaller than the ratio of 1∶ 50 in the original solution. Different concentrations of sulfuric acid were used for resin desorption. Mg^2＋was desorbed from the resin,and Ni2 ＋was hardly desorbed in the sulfuric acid of 9 g·L^-1. When the sulfuric acid concentration was 36 g·L^-1,Ni2 ＋started to be desorbed. The exchange capacity of Ni2 ＋was0. 487 mmol·g- 1（ 0.613 mmol·ml- 1）. The average concentration of Ni2 ＋in the solution was 4. 84 g·L^-1,which increased by 8 times and the desorption rate was up to 97. 47%.

关 键 词：离子交换 生物浸出液 高镁 镍镁分离 

分 类 号：TF18[冶金工程—冶金物理化学]