硫化物固-液界面电化学效应实验探讨  

An Experimental Study of the Electrochemical Effect on the Solid-Liquid Interface of Sulphide

作　　者：贾建业[1] 谢先德[1] 吴大清[1] 兰斌明[2] 潘兆橹[3] 王建成 朱长友 

机构地区：[1]中国科学院广州地球化学研究所,510640 [2]西安工程学院,710054 [3]中国地质大学,武汉430074 [4]辉县地质矿产局,河南辉县453600

出　　处：《地质论评》2001年第3期250-254,共5页Geological Review

基　　金：国家自然科学基金(编号49872017);中国科学院王宽诚博士后奖励基金;广东省博士后科学基金

摘　　要：硫化物作为一类重要的常见矿物,目前国内外对其表面矿物学特征研究有限。具体到硫化物固-液界面处的行为机理,前人的研究程度就更低了。笔者自行设计了一个Fe_(1-x)S-Cr^(6+)原电池,通过实测电动势(E)、t-E关系曲线、溶液可见光吸收谱及其λ-A关系曲线,阐明硫化物与Cr^(6+)溶液间的界面行为机理。认为其界面行为过程为:硫化物溶解→离子反应(氧化还原)→吸附Cr^(3+)。该原电池与一般原电池结构不同,其主要差别在于将反应电极和测量电极分开,从而解决电极反应过程中的浓度极化问题,提高了电化学实验的精度。该研究成果有助于揭示矿物—液体相互作用机理,完善和丰富表面矿物学研究内容,深化界面成矿理论,并对环境治理、矿物材料应用等开发领域具有重要的参考价值。Surface mineralogy is one of the modern branches of mineralogy. The research of the interface of mineral liquid, namely the reaction of mineral liquid, is one of the most interesting and important subjects. This paper is concentrated on sulphides, which are important and common minerals in the nature. The electrochemical behaviour on the interface between sulphide and solution is the main objective in this study. A Fe1-xS-Cr6+ pile is designed to prove how hardly-dissoluble sulphides reduce Cr6+ into Cr3+. Through the measurement of electrical potential (E), t-E relation curve, the visible adsorption spectrum and the X-A relation curve of Cr6+ solution, the problem has been solved. According to computer retrieval of previous references and data, no such eletro-chemical analysis has ever been used in the research of the interface reaction between natural sulphide minerals and solution. A number of valuable results, not only theoretical but also actual, have been gained from the research. In short, the results show that the electrochemical effect on sulphide liquid interface, which is of great significance, can be applied to the treatment of environmental pollutants, the studies of reaction kinetics of metallic minerals and mechanism of metallic deposits and so on.

关 键 词：硫化物 磁黄铁矿 固-液界面 机理 电化学效应 地球化学动力学 

分 类 号：P59[天文地球—地球化学]