Microbial oxidation of refractory gold sulfide concentrate by a native consortium  

本地混合菌群微生物氧化难处理含金硫化精矿（英文）

作　　者：N. MARCHEVSKY M. M. BARROSO QUIROGA A. GIAVENO E. DONATI 

机构地区：[1]Centro de Investigación y Desarrollo en Fermentaciones Industriales (CINDEFI, CCT LA PLATA-CONICET,UNLP), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calle 50 N° 227, 1900 La Plata, Argentina [2]Departamento de Minería, Facultad de Ciencias Físico-Matemáticas y Naturales Universidad Nacional de San Luis, Chacabuco 917, 5700 San Luis, Argentina [3]Instituto de Investigación y Desarrollo en Ingeniería de Procesos Biotecnología y Energías Alternativas (PROBIEN, CONICET-UNCo), Departamento de Química Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, 8300 Neuquén, Argentina

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第5期1143-1149,共7页中国有色金属学报（英文版）

基　　金：supported by PIP 0368 from CONICET and PICT 0630 and 0623 from ANPCyT

摘　　要：A defined mesophilic consortium including an iron oxidizing bacterium and a sulfur oxidizing bacterium was constructed to evaluate its ability for bioleaching a flotation concentrate from Andacollo mine in Neuquén,Argentina.Experiments were performed in shake flasks with a pulp density of10%(w/v),using a basal salt medium containing ferrous iron at pH1.8.The leaching solutions were analyzed for pH,redox potential(using specifics electrodes),ferrous iron(by UV-Vis spectrophotometry)and metal concentrations(by atomic absorption spectroscopy).The results showed that the consortium was able to reduce the refractory behavior of the concentrate,allowing91.6%of gold recovery;at the same time,high dissolution of copper and zinc was reached.These dissolutions followed a shrinking core kinetic model.According to this model,the copper solubilization was controlled by diffusion through a product layer(mainly jarosite),while zinc dissolution did not show a defined control step.This designed consortium,composed of bacterial strains with specific physiological abilities,could be useful not only to optimize gold recovery but also to decrease the leachates metallic charge,which would be an environmental advantage.采用含铁氧化菌和硫氧化菌的混合嗜中温菌群浸出阿根廷Andacollo矿的含金硫化浮选精矿。实验在摇瓶中进行,矿浆浓度为10%,采用pH 1.8的含亚铁离子的基础盐溶液作为介质。采用不同的方法对浸出液的pH值、氧化还原电位、亚铁离子和总金属浓度进行测定。结果表明,该种混合菌能够很好地还原浸出该难处理金矿,金的回收率可达91.6%,同时,铜和锌的浸出率也较高。动力学研究表明金属的溶解符合收缩核模型。其中,铜的溶解速率受生成产物层的扩散控制,而锌的溶解没有明显的控制步骤。

关 键 词：BIOOXIDATION refractory gold concentrate native consortium kinetic analysis 

分 类 号：TD925.5[矿业工程—选矿] TD953