金属学报  2012, Vol. 48 Issue (9): 1145-1152    DOI: 10.3724/SP.J.1037.2012.00279

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黄铜矿表面生物氧化膜的形成过程

杨洪英, 潘颢丹, 佟琳琳, 刘媛媛

东北大学材料与冶金学院, 沈阳 110819

FORMATION PROCESS OF BIOLOGICAL OXIDE FILM ON CHALCOPYRITE CRYSTAL SURFACE

YANG Hongying, PAN Haodan, TONG Linlin, LIU Yuanyuan

School of Materials and Metallurgy, Northeastern University, Shenyang 110819

杨洪英 潘颢丹 佟琳琳 刘媛媛. 黄铜矿表面生物氧化膜的形成过程[J]. 金属学报, 2012, 48(9): 1145-1152.
, , , . FORMATION PROCESS OF BIOLOGICAL OXIDE FILM ON CHALCOPYRITE CRYSTAL SURFACE[J]. Acta Metall Sin, 2012, 48(9): 1145-1152.

摘要 参考文献 相关文章 Metrics 全文: PDF(3028 KB)   摘要: 在细菌浸出黄铜矿的过程中, 浸出速率缓慢的原因是矿物表面会形成一层阻碍矿物与浸出液之间物质交换的钝化膜, 这层膜的组成会随着浸出的进行而变化. 利用SEM, EDS, XRD和XPS等对细菌浸出黄铜矿的过程中, 矿物表面的形貌、组成及物相变化进行了研究. 结果表明, 黄铜矿在细菌浸出过程中依次形成了缺铁铜硫化物 Cu1-xFe1-ySz(x<y), 单质硫晶体S0, 氧化铁, 羟基氧化铁和黄钾铁矾. 由于浸矿混合细菌ASH-07对硫的氧化作用, 硫化物层和单质硫层都是氧化膜形成过程中的中间产物, 致密的黄钾铁矾层则对黄铜矿的浸出产生钝化作用. 关键词 ： 黄铜矿,  钝化,  表面,  细菌氧化,  黄钾铁矾     Abstract：Chalcopyrite (CuFeS2) is the most common copper bearing sulfide in the natural world, and it is also the most widespread copper ore in the world. Pyrometallurgy is used to extract copper from chalcopyrite as main industrial method. However, environmentally friendly metallurgy is advocated because of increasingly serious environmental pollution. The bacterial metallurgy is considered a new clean smelting technology to deal with low--grade and complicated composition metal resources because of short flow, simple operation, low investment and friendly environment. In the process of bioleaching, the formation of oxide film on the chalcopyrite crystal surface hindered the rapid dissolution of chalcopyrite and restricted the large-scale application of copper bioleaching. It is concluded that the oxide film inhibits material exchange between chalcopyrite and leaching liquid on the surface of the chalcopyrite and depresses its leaching rate significantly. In the paper, the advanced surface analysis technologies, such as SEM, XRD and X-ray photoelectron spectroscopy (XPS) are used to observe and analysis the surface layer in the bacterial leaching process. It is studied for the formation of bio-oxide film on the natural chalcopyrite crystal surface, in order to reveal the passivation mechanism of chalcopyrite bioleaching. Through the observation of the microcosmic morphology characteristic changes of chalcopyrite during bioleaching, different chemical composition analysis of surface oxide layer in the different bacterial oxide phase were studied. The results show that the insoluble oxide film inhibits material exchange between chalcopyrite and leaching liquid on the surface of the chalcopyrite and depresses its leaching rate significantly. The results show that the rudiments of oxide film are formed on the surface of chalcopyrite after leaching for 72 h. The oxide layer with certain thickness is formed after 96 h, and the passivation is produced. The compact film is formed after 168 h because bacterial corrosion spots and rillsare formed on the surface of chalcopyrite, and it is begun to produce serious passivation. The variation of chemical state of sulfur element is S2-→S0→S4+→S6+. The reaction product, including iron deficiency copper sulfide Cu$_{1-x}$Fe$_{1-y}$S$_{z}$($x iron oxide (Fe(III)-oxide), iron hydroxide oxide (Fe(III)-O-OH) and jarosite (KFe3(SO4)2(OH)6) are formed on the surface of chalcopyrite in order in the bioleaching process. The chalcopyrite passive film formed is caused by the stable and compact layer whose main composition is jarosite, and it produces strong passivation effects on the chalcopyrite bacterial leaching. Key words： chalcopyrite crystal    passivation    surface    bacterial oxidation    jarosite 收稿日期: 2012-05-14      ZTFLH:  TF111.3   基金资助: 国家自然基金项目51174062, 51104036和50874030, 国家高技术研究发展计划项目2012AA061502和2012AA061501及中央高校基本科研业务费专项资金项目N100602007资助 作者简介: 杨洪英, 女, 1960年生, 教授 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 杨洪英 潘颢丹 佟琳琳 刘媛媛 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00279      或      https://www.ams.org.cn/CN/Y2012/V48/I9/1145 [1] BrierleyJ A. FEMS Microbiol Lett, 1990; 75: 287 [2] Rohwerder T, Gehrke T, Kinzler K, Sand W. Appl Microbiol Biotechnol, 2003; 63: 239 [3] Dutrizac J E. Metall Trans, 1978; 9B: 431 [4] Petersen J, David G D. Hydrometallurgy, 2006; 83: 40 [5] Morin D, Lips A, Pinches T, Huisman J, Frias C, Norberg A, Forssberg E. 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