石英对微生物浸出黄铜矿的作用  

Effect of quartz on bioleaching of chalcopyrite

作　　者：莫晓兰[1,2] 林海[1,2] 董颖博[1,2] 傅开彬[1,2] 徐承焱[1,2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]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：《北京科技大学学报》2011年第6期682-687,共6页Journal of University of Science and Technology Beijing

基　　金：北京市教育委员会共建项目建设计划资助项目(No.XK100080432)

摘　　要：为探明石英在微生物浸出铜过程中的作用与影响,选择粒度<43μm的石英,与黄铜矿和黄铁矿形成矿浆浸出体系,考察了石英质量浓度对黄铜矿浸出效果的影响.结果表明:适量的石英,其粒度越细越能促进黄铜矿的浸出.当石英质量浓度为50g·L-1、粒度<43μm时,黄铜矿的浸出率最高可达54·09%,比不添加石英的浸出率提高了近20%;通过对微生物浸出过程的氧化还原电位、pH值、Fe2+、Fe3+变化分析,以及浸渣的扫描电镜和能谱分析发现,石英促进黄铜矿浸出主要表现在能缩短微生物浸出的延迟时间,它对浸出过程新生成的沉淀具有吸附作用,能在一定程度上减轻沉淀对黄铜矿浸出的阻碍.In order to clarify the function of quartz in chalcopyrite bioleaching,quartz with particle sizes less than 43 μm was used to prepare a slurry system with chalcopyrite and pyrite for studying the effect of the mass concentration of quartz on the bioleaching efficiency of chalcopyrite.It is shown that the bioleaching of chalcopyrite can be improved by the addition of proper amount of quartz with finer particle sizes.Under the addition of 50 g·L-1 quartz whose particle size was less than 43 μm,the largest leaching rate of chalcopyrite is 54.09%.Based on the analysis of oxidation-reduction potential,pH values,Fe2＋ and Fe3＋ mass concentrations and the results of scanning electron microscopy and energy dispersive spectroscopy,quartz benefits the bioleaching of chalcopyrite,and this phenomenon mainly presents a decrease of bioleaching delay time.Moreover,new precipitates generated in the leaching process can be adsorbed by quartz,which reduces the hindrance of precipitation during chalcopyrite bioleaching.

关 键 词：黄铜矿 黄铁矿 生物浸出 细菌 石英 

分 类 号：TD925.5[矿业工程—选矿]