毒砂型高砷金精矿的细菌氧化  

Biooxidation of high arsenic gold concentrate with arsenopyrite type

作　　者：崔日成[1] 杨洪英[1] 张谷平[1] 马玉蕊[1] 范金[1] 李科峰[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《化工学报》2008年第12期3090-3094,共5页CIESC Journal

基　　金：国家自然科学基金项目(50674029; 50274024);国家高技术研究发展计划项目(2006AA06Z127)~~

摘　　要：通过毒砂型高砷金精矿和单矿物纯毒砂的氧化对比摇瓶试验,发现由于金精矿中黄铁矿的存在促进了矿物的脱砷效率,脱砷速度明显高于纯毒砂。经过10d和15d的细菌氧化脱砷,金精矿和毒砂的最终脱砷率分别达到93.90%和64.45%。对毒砂氧化渣的显微镜观察以及XRD衍射分析发现,毒砂颗粒外壁被氧化过程中产生的黄氨铁矾沉淀所覆盖,隔绝了它与外界环境的接触,最终导致了毒砂氧化速度缓慢,脱砷效果不够彻底。In this paper, contrast flask bacterial tests of high arsenic gold concentrate with arsenopyrite type and pure arsenopyrite mineral showed that the pyrite in the concentrate promoted the efficiency of dearsenication rate of the mineral, it was significantly higher than pure arsenopyrite. After 10 d and 15 d of bacterial oxidation of dearsenieation, the final dearsenication rates of gold concentrate and arsenopyrite mineral were 93.90% and 64.45%, respectively. Microscope observation and XRD diffraction analysis of arsenopyrite oxide slag showed that arsenopyrite was covered with NH4Fea （SO4）2（OH）6 which isolated arsenopyrite from its environment. This phenomenon eventually led to the slow oxidation rate of arsenopyrite and inadequate dearsenication effect.

关 键 词：氧化亚铁硫杆菌 毒砂 金精矿 脱砷率 

分 类 号：TF831[冶金工程—有色金属冶金]