Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第24卷    第11期    总第188期    2014年11月

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文章编号:1004-0609(2014)11-2928-07
磷灰石在微生物浸铜体系的溶出特性及对浸铜效率的影响
周闪闪1, 2,林 海1, 2,董颖博1, 2,许晓芳1, 2

(1. 北京科技大学 金属矿山高效开采与安全教育部重点实验室,北京 100083;
2. 北京科技大学 土木与环境工程学院,北京 100083
)

摘 要: 为了探明磷灰石在微生物浸出黄铜矿体系中的溶出特性及其对黄铜矿浸出的影响,选择粒径小于43 μm的磷灰石与粒径小于74 μm的黄铜矿以及At.f菌组成矿浆浸出体系,考察不同At.f菌接种量对于磷灰石溶出速率的影响及对黄铜矿浸出效果的影响。结果表明:浸出体系中含低浓度PO43-可以提高铜的浸出效率;当At.f菌接种量为5%时,微生物浸出体系中磷灰石溶出的PO43-浓度最小,为0.62 mg/L,此时黄铜矿的最终浸出率最高,达到57.4%,比PO43-溶液浓度最高时体系的铜浸出率提高近30%。通过对微生物浸出前、后的浸渣进行扫描电镜、能谱分析和XRD分析发现,浸出后磷灰石表面浸蚀不明显,而黄铜矿表面浸蚀明显,同时浸渣中有新物质铵黄铁矾生成;磷灰石对于新生成的沉淀有一定的吸附作用,而且溶出较低浓度的PO43-体系能提高黄铜矿的 浸出。

 

关键字: 黄铜矿;磷灰石;微生物浸出;At.f菌

Dissolution characteristics of apatite in chalcopyrite bioleaching system and its influence on chalcopyrite leaching efficiency
ZHOU Shan-shan1, 2, LIN Hai1, 2, DONG Ying-bo1, 2, XU Xiao-fang1, 2

1. Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education,
University of Science and Technology Beijing, Beijing 100083, China;
2. School of Civil and Environmental Engineering,University of Science and Technology Beijing, Beijing 100083, China

Abstract:To make sure the dissolution characteristics of apatite in the chalcopyrite bioleaching system and the influence on the chalcopyrite leaching efficiency, the apatite with particle size of less than 43 μm, chalcopyrite with 74 μm and Acidithiobacillus ferrooxidans (At.f) were used to prepare a bioleaching system. And the influence of different At.f inoculation amount on the apatite dissolution rate and chalcopyrite leaching effect were studied. The results show that chalcopyrite leaching efficiency can be improved when there exists PO43- with low concentration in the bioleaching system. And PO43- reaches the lowest concentration of 0.62 mg/L in the bioleaching system when the At.f inoculation amount is 5%, and the final chalcopyrite leaching rate reaches the highest of 57.4%, which is 30% higher than that in the bioleaching system with the highest concentration of PO43-. Scanning electron microscope (SEM), energy dispersive spectroscope and X-ray diffraction (XRD) analyses before and after the bioleaching show that, there is not any obvious erosion on the apatite surface after leaching, while obvious erosion exists on the chalcopyrite surface and new compound ammoniojarosite generates in the leaching residue. And the precipitates newly generated can be absorbed by apatite, low concentration PO43- in the bioleaching system can improve the leaching of chalcopyrite.

 

Key words: chalcopyrite; apatite; bioleaching; Acidithiobacillus ferrooxidans

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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