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

作     者：张旭 冯雅丽 李浩然 Xu ZHANG;Ya-li FENG;Hao-ran LI

作者机构：北京科技大学土木与环境工程学院北京100083 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 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2016年第26卷第9期

页      面：2479-2484页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 080601[工学-冶金物理化学] 

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 

主　　题：arsenopyritic gold ore pyrolusite bio-oxidation Acidithiobacillus ferrooxidans 

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.