(東北大學(xué) 資源與土木工程學(xué)院，沈陽 110819)
摘 要: 為提高黃銅礦生物浸出率，研究聚乙二醇(PEG)對(duì)Acidithiobacillus ferrooxidans strain XZ11 Fe2+氧化活性和黃銅礦生物浸出過程的影響，并采用SEM和EDS對(duì)浸出后礦物表面形貌和相組成進(jìn)行表征。結(jié)果表明：相對(duì)分子質(zhì)量大于200的PEG對(duì)Acidithiobacillus ferrooxidans Fe2+氧化活性具有一定的促進(jìn)作用，添加30 mg/L PEG 2000時(shí)，浸出20 d后，銅浸出量高達(dá)451.70 mg/L，較不添加FEG時(shí)提高了1.11倍；添加PEG時(shí)，黃銅礦表面的侵蝕面呈溝壑狀，出現(xiàn)溶蝕坑，并生成Fe3+的羥基化多聚物Fe(Ⅲ)—O—OH。PEG的添加提高了浸出體系中細(xì)菌濃度和Fe3+濃度，加速了黃銅礦的溶解。
關(guān)鍵字: 黃銅礦；聚乙二醇；氧化亞鐵硫桿菌；生物浸出；表面活性劑
（College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China）
Abstract:Polyethylene glycol (PEG) was used to improve the bioleaching rate of chalcopyrite by Acidithiobacillus ferrooxidans (At.f) strain XZ11. The effect of PEG on the Fe2+ oxidizing activities of Acidithiobacillus ferrooxidan and bioleaching of chalcopyrite were investigated. The surface morphologies and phase composition of chalcopyrite after bioleaching were characterized by SEM and EDS. The results show that PEG with relative molecular mass greater than 200 can promote the Fe2+ oxidizing activities of Acidithiobacillus ferrooxidan After bioleaching for 20 d, the copper extraction yield of chalcopyrite with 30 mg/L PEG 2000 is 451.70 mg/L, which increases by about 1.11 times compared with the bioleaching without PEG. Native-like structure, holes and Fe(III)—O—OH form on the erosion surface of chalcopyrite. PEG can increase the cell density of Acidithiobacillus ferrooxidan and Fe3+ concentration in the leaching solution, consequently, accelerates the chalcopyrite oxidation dissolution.
Key words: chalcopyrite; polyethylene glycol; Acidithiobacillus ferrooxidans; bioleaching; surfactant
