Enhancement of bio-oxidation of refractory arsenopyritic gold ore by adding pyrolusite in bioleaching system  

添加软锰矿强化复杂难选冶含砷金矿的生物氧化过程（英文）

作　　者：张旭[1,2] 冯雅丽[1] 李浩然[2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]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

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第9期2479-2484,共6页中国有色金属学报（英文版）

基　　金：Project(2015ZX07205-003)supported by the National Water Pollution Control and Treatment Science,China;Project(DY125-15-T-08)supported by China Ocean Mineral Resource R&D Association;Project(2012BAB07B05)supported by the National Key Technology R&D Program of China;Project(2012AA062401)supported by the National High-tech Research and Development Program of China

摘　　要：Pyrolusite was added in the bioleaching process to enhance the bio-oxidation process. Bioleaching tests at different dosages of pyrolusite ore, pH and inoculation amounts of Acidithiobacillus ferrooxidans were studied. The results showed that the time of the bio-oxidation process was decreased obviously and the arsenic leaching rate reached 94.4% after the bioleaching. The bio-oxidation of arsenopyrite and the effective extraction of manganese from pyrolusite were achieved by the bioleaching process. After bioleaching, the leaching rate of gold from the reaction residues reached 95.8% by cyanide leaching. In the bio-oxidation process, pyrolusite increased the redox potential of the solution to accelerate the bioleaching rate. The experiment showed that there were two reaction modes in the bioleaching process.通过控制生物浸出试验中软锰矿用量、过程p H和细菌接菌量等条件,对添加软锰矿强化复杂难选冶含砷金矿的生物氧化过程进行研究。结果表明,添加软锰矿可以缩短含砷金矿的生物氧化时间,砷的浸出率达到94.4%。反应过程中实现了含砷金矿中砷黄铁矿氧化的同时,软锰矿中锰元素高效浸出。生物浸出渣的氰化浸出实验结果表明,经软锰矿强化生物氧化后,生物浸出渣中金的氰化浸出率达到95.8%。生物浸出过程中,添加软锰矿能提高生物浸出溶液的氧化还原电位,从而促进生物氧化过程,且添加软锰矿后生物浸出过程中存在两种不同的反应方式。

关 键 词：arsenopyritic gold ore PYROLUSITE BIO-OXIDATION Acidithiobacillus ferrooxidans 

分 类 号：TF18[冶金工程—冶金物理化学]