Well-controlled stirring tank leaching to improve bio-oxidation efficiency of a high sulfur refractory gold concentrate  

精确调控搅拌浸出提高高硫金精矿的生物预氧化效率

作　　者：WU Biao SHANG He WEN Jian-kang LIU Mei-lin ZHANG Qi-dong CUI Xing-lan 武彪;尚鹤;温建康;刘美林;张其东;崔兴兰(National Engineering Laboratory of Biohydrometallurgy,GRINM Group Co.,Ltd.,Beijing 100088,China;GRINM Resources and Environment Tech.Co.,Ltd.,Beijing 101407,China;GRIMAT Engineering Institute Co.,Ltd,Beijing 101407,China;General Research Institute for Nonferrous Metals,Beijing 100088,China)

机构地区：[1]National Engineering Laboratory of Biohydrometallurgy,GRINM Group Co.,Ltd.,Beijing 100088,China [2]GRINM Resources and Environment Tech.Co.,Ltd.,Beijing 101407,China [3]GRIMAT Engineering Institute Co.,Ltd,Beijing 101407,China [4]General Research Institute for Nonferrous Metals,Beijing 100088,China

出　　处：《Journal of Central South University》2020年第5期1416-1423,共8页中南大学学报（英文版）

基　　金：Projects(51704028,51574036)supported by the National Natural Science Foundation of China;Project supported by Program for Key Laboratory of Biohydrometallurgy of Ministry of Education Foundation,China。

摘　　要：For the high sulfur refractory gold concentrate with 41.82%sulfur and 15.12 g/t gold,of which 82.11%was wrapped in sulfide,a well-controlled stirring tank leaching was carried out to improve the bio-oxidation efficiency.Results show that bio-oxidation pretreatment can greatly improve the gold recovery rate of high-sulfur refractory gold concentrate,and at the optimum pH 1.3 in this study,compared with the process without pH control,the oxidation rate of sulfur increased from 79.31%to 83.29%,while the recovery rate of gold increased from 76.54%to 83.23%;under this condition the activity of mixed culture could be sustained and the formation of jarosite could diminish.The results also displayed that for the high sulfur refractory gold concentrate,the recovery of gold is positively correlated with the oxidation rate of sulfur,and the recovery rate of gold increases with the increase of sulfur oxidation rate within a certain range.来自于中国贵州的某高硫难处理金精矿含硫41.82%,含金15.12g/t,其中82.11%的金被硫化物包裹,直接浸出金回收率低。针对该样品开展了生物预氧化搅拌浸出研究,同时对生物预氧化过程体系pH进行了在线调控。结果表明,生物氧化预处理可以大幅度提高高硫难处理金精矿的金回收率,在最适pH为1.3的条件下,pH调控工艺与无pH调控的工艺相比,硫的氧化率从79.31%提高到83.29%,黄金的回收率从76.54%增加到83.23%,在此条件下,混合菌可以保持较高的活性,同时可以避免黄钾铁矾的形成。生物预氧化渣浸金结果表明,对于高硫难处理金精矿,金的回收率与硫的氧化速率呈正相关,在一定范围内金的回收率随着硫氧化速率的增加而增加。

关 键 词：BIO-OXIDATION high-sulfur refractory gold concentrate stirring leaching pH control 

分 类 号：TF831[冶金工程—有色金属冶金]