摘要:
研究了两种不同类型(黄铁矿型,斑岩型)黄铜矿生物浸出的差异.实验结果表明:两类黄铜矿生物浸出差别很大,48 d后黄铁矿型黄铜矿浸出率为46.96%,斑岩型黄铜矿浸出率为14.5%.对Fe2+、矿物表面Cu2p谱图和矿床特征的分析发现:适量的Fe2+能促进黄铜矿的浸出,但最佳用量不一样;浸渣表面产物不同,斑岩型黄铜矿表面出现富铜层,阻碍了浸出继续进行;与原矿相比,铜结合能都降低,符合Hiroyoshi等提出黄铜矿浸出的两步溶解模型;两类黄铜矿生物浸出的差异是由成矿岩体、围岩、伴生矿物和元素、成矿温度和压力等因素综合决定的.
关键词:
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黄铜矿
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生物浸出
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矿床特征
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结合能
Abstract:
Bioleaching of chalcopyrite with two different types,pyrite type and porphyry type,was compared.It is shown that there is a great difference in leaching efficiency.After 48d,the copper leaching rate reaches 46.96% for the pyritic chalcopyrite,while it is 14.5% for the porphyry chalcopyrite.Based on the analysis of Fe2+,Cu 2p spectra on the chalcopyrite surface and deposit characteristics,a moderate amount of Fe2+ can promote bioleaching of the two kinds of chalcopyrite,but their optimal dosages are distinct.Different products appear on the surfaces of leached residues,and there is a copper-rich layer on the porphyry chalcopyrite,which hinders a greater copper extraction.Compared with the crude ore,Cu peak shift to lower binding energies was observed,following the leaching mechanism suggested by Hiroyoshi et al.the difference in bio-leaching between them is dependent on the integration of many factors such as metallogenic rock,wall rock,associated minerals and elements,metallogenic temperature and pressure.
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