细菌-矿物接触/非接触模式下黄铜矿浸出溶解行为  

Chalcopyrite dissolution behavior under microbe-mineral contact/uncontact model

作　　者：顾帼华[1] 郭玉武[1,2] 

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083 [2]湖南有色金属研究院,湖南长沙410015

出　　处：《中南大学学报（自然科学版）》2011年第8期2167-2172,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50621063);国家重点基础研究发展计划("973"计划)项目(2010CB630903)

摘　　要：研究细菌-矿物接触模式及利用透析袋将细菌和矿物隔离的非接触模式下嗜酸氧化亚铁硫杆菌对黄铜矿浸出溶解的影响,并对黄铜矿浸出过程表面钝化的原因进行分析。研究结果表明:在细菌-矿物接触模式下,黄铜矿的浸出行为包括细菌对黄铜矿表面硫的催化氧化及细菌氧化Fe2+生成的Fe3+对黄铜矿在于氧化溶解;在细菌-矿物非接触模式下,黄铜矿主要通过细菌氧化Fe2+生成的Fe3+氧化浸出;浸出体系电位是影响黄铜矿浸出速率的主要因素,且较高的电位更有利于黄铜矿的浸出。比较细菌-矿物接触模式和细菌-矿物非接触模式,细菌-矿物接触模式比非接触模式更有利于提高浸出体系电位及氧化消除黄铜矿表面生成的硫膜,因而促进了黄铜矿的浸出;易于在较高电位下生成的黄钾铁矾沉淀是导致这2种模式下黄铜矿表面钝化的主要原因。The impact of A.ferrooxidans on dissolution of chalcopyrite in the microbe-mineral contact/uncontact model was studied by employing dialysis bag to insulate the bacteria from chalcopyrite,and the preliminary analysis of surface passivation in leaching process was also investigated.The results show that the behaviors of chalcopyrite leaching include the oxidation of bacteria on elemental sulfur as well as the oxidation of ferric ion,the oxidation product of ferrous ion,on chalcopyrite dissolution in the microbe-mineral contact model;however,the dissolution of chalcopyrite is determined by the oxidation of ferric ion in the microbe-mineral uncontact model.The leaching rate of chalcopyrite is controlled mainly by potentials of leaching system,and high potential is more conductive to chalcopyrite leaching.The microbe-mineral contact model is more conductive to the increase of potentials than microbe-mineral uncontact model,and can eliminate the sulfur film on chalcopyrite surface.Therefore,it is more profitable for leaching of chalcopyrite than uncontact model.The jarosite easily generated on chalcopyrite surface at high potentials is the main cause of surface passivation of chalcopyrite in both microbe-mineral contact and uncontact model.

关 键 词：黄铜矿 嗜酸氧化亚铁硫杆菌 表面钝化 浸出机理 

分 类 号：TF18[冶金工程—冶金物理化学] TD925[矿业工程—选矿]