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首页> 外文会议>International Symposium on Electrochemistry in Mineral and Metal Processing Ⅴ, May 14-18, 2000, Toronto, Canada >EFFECT OF SURFACE NON-STOICHIOMETRY ON THE DISSOLUTION OF METAL SULFIDES
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EFFECT OF SURFACE NON-STOICHIOMETRY ON THE DISSOLUTION OF METAL SULFIDES

机译：表面非化学计量法对金属硫化物溶解的影响

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摘要

The non-equilibrium metal-depleted layers (NL) formed at galena, sphalerite and other minerals as a result of leaching in acidic solutions have been studied using XPS, UPS, SEM and X-ray spectroscopy; the results obtained have been compared with data derived from electrochemistry and dissolution kinetics of the minerals. The surface S/Me ratios, Fermi level energy, distortions of the sulfide lattice and electronic band structure up to micrometers in depth, in particular, the changes in effective local charge of S sublattice atoms, have been found to be dependent on leaching media composition, potential, and treatment duration. According to the model proposed, the leaching and electrochemical behavior of the minerals are largely associated with transformations of the NL. The properties of the disordered semiconductor, NL, are governed, similar to non-crystalline chalcogenides, by negative correlation energy centers associated with sulfur atoms.
机译：使用XPS，UPS，SEM和X射线光谱研究了方铅矿，闪锌矿和其他矿物在酸性溶液中浸出后形成的非平衡金属贫化层（NL）；将获得的结果与矿物的电化学和溶出动力学数据进行了比较。已经发现表面的S / Me比，费米能级，硫化物晶格的畸变和电子能带结构的深度可达微米，尤其是S亚晶格原子的有效局部电荷的变化取决于浸出介质的组成。 ，潜力和治疗时间。根据提出的模型，矿物的浸出和电化学行为在很大程度上与NL的转变有关。与非晶硫族化物相似，无序半导体的性质受与硫原子相关的负相关能量中心的支配。

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