(1. 北京有色金屬研究總院, 北京 100088;
2. 中南大學(xué) 資源加工與生物工程學(xué)院, 長(zhǎng)沙 410083;
3. 福建紫金礦業(yè)股份有限公司, 上杭 364200)
摘 要: 研究了黃銅礦與黃鐵礦混合礦細(xì)菌浸出過程的原電池效應(yīng), 提出了原電池效應(yīng)模型。 研究結(jié)果表明: 當(dāng)黃銅礦細(xì)菌浸出過程中加入黃鐵礦及C時(shí), 浸出率大大提高, 黃銅礦浸出30d, Cu浸出率可達(dá)40%; 單一黃鐵礦細(xì)菌浸出時(shí), 黃鐵礦會(huì)被大量氧化分解, 而當(dāng)與黃銅礦混合浸出時(shí),黃銅礦氧化加快, 黃鐵礦氧化速率降低; 加入C及黃鐵礦與黃銅礦混合時(shí), 由于接觸電位的影響, 黃銅礦氧化反應(yīng)電流增大、 反應(yīng)起始電位負(fù)移, 反應(yīng)加劇, 而黃鐵礦的氧化反應(yīng)受到抑制; 混合礦浸出過程中, 黃銅礦表面Cu含量較單一礦浸出時(shí)低得多, 說明混合效應(yīng)對(duì)浸出具有強(qiáng)化作用; 黃銅礦中Cu浸出愈多, 表面生成的元素硫愈多, 黃鐵礦細(xì)菌浸出時(shí), 表面不會(huì)有元素硫產(chǎn)生。
關(guān)鍵字: 細(xì)菌浸出; 原電池效應(yīng); 粉末微電極; 電化學(xué)機(jī)理
(1. General Research Institute of Nonferrous Metal, Beijing 100088, China;
2. School of Resources Processing and Bioengineering, Changsha 410083, China;
3. Fujian Zijin Minning, Shanghang 364200, China)
Abstract:The galvanic effect of pyrite and chalcopyrite mixed sulfide at bio-leaching was investigated. It is indicated that the chalcopyrite leaching rate increases after adding pyrite as well as carbon, after leached 30d, the leaching date is up to 36%. The results show that in the presence of bacteria the pyrite will be oxidized greatly, but when mixed with chalcopyrite, few pyrite is oxidized, however the oxidation of chalcopyrite is increased. The CV curve demonstrates that when pyrite and carbon are added, the current of oxidation peak of chalcopyrite increases, the potential decreases and the reaction rate increases. The surface EDS analysis reveals that the galvanic effect of mixed sulfide strengthens the oxidation of mineral. During bio-leaching, to the chalcopyrite, the more Cu is leached, the more element sulfur can form on the mineral surface, but to the pyrite, no element sulfur is on the surface.
Key words: bioleaching; galvanic effect; powder microelectrode


