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石英對微生物浸出黃銅礦的作用

Effect of quartz on bioleaching of chalcopyrite

  • 摘要: 為探明石英在微生物浸出銅過程中的作用與影響,選擇粒度<43μm的石英,與黃銅礦和黃鐵礦形成礦漿浸出體系,考察了石英質量濃度對黃銅礦浸出效果的影響.結果表明:適量的石英,其粒度越細越能促進黃銅礦的浸出.當石英質量濃度為50g·L-1、粒度<43μm時,黃銅礦的浸出率最高可達54.09%,比不添加石英的浸出率提高了近20%;通過對微生物浸出過程的氧化還原電位、pH值、Fe2+、Fe3+變化分析,以及浸渣的掃描電鏡和能譜分析發現,石英促進黃銅礦浸出主要表現在能縮短微生物浸出的延遲時間,它對浸出過程新生成的沉淀具有吸附作用,能在一定程度上減輕沉淀對黃銅礦浸出的阻礙.

     

    Abstract: In order to clarify the function of quartz in chalcopyrite bioleaching,quartz with particle sizes less than 43 μm was used to prepare a slurry system with chalcopyrite and pyrite for studying the effect of the mass concentration of quartz on the bioleaching efficiency of chalcopyrite.It is shown that the bioleaching of chalcopyrite can be improved by the addition of proper amount of quartz with finer particle sizes.Under the addition of 50 g·L-1 quartz whose particle size was less than 43 μm,the largest leaching rate of chalcopyrite is 54.09%.Based on the analysis of oxidation-reduction potential,pH values,Fe2+ and Fe3+ mass concentrations and the results of scanning electron microscopy and energy dispersive spectroscopy,quartz benefits the bioleaching of chalcopyrite,and this phenomenon mainly presents a decrease of bioleaching delay time.Moreover,new precipitates generated in the leaching process can be adsorbed by quartz,which reduces the hindrance of precipitation during chalcopyrite bioleaching.

     

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