Progress in Experimental Investigations on the Adsorption-Reduction of Gold Complexes by Pyrite
详细信息
- 责任者：Li Suning (Laboratory for High Temperature and High Pressure Study of the Earth’s Interior ; Institute of Geochemistry ; Chinese Academy of Sciences ; Guiyang 550002 ; China) ; Zhou Li
- 刊名：Earth and Environment
- 出版年：2013
- 卷期：41(2)
- 关键词：金矿 ; gold ores ; 黄铁矿 ; pyrite ; 吸附作用 ; adsorption
- 页码：p.185-192
- 图表：illus., 77 refs.
- 分类号：1001
- issnNo：ISSN1672-9250
- isbnNo：CN52-1139/P
摘要
Gold adsorption metallogenesis is an important metallogenic mechanism at supergene and low temperature conditions.We summarized the experimental investigation methods of gold adsorption-reduction by pyrite and discussed the gold reduction mechanism on pyrite surface in different gold complexes solutions.The adsorption of Au-S complexes on pyrite surface is mainly the processes of electrostatic adsorption and surface complexation.Because the reduction reaction rate of the adsorption of Au-S complexes on pyrite surface is quite low,desorption will occurs once the conditions are changed.However,the adsorbed Au-Cl complexes on pyrite surface are rapidly reduced,and natural gold particles are produced through it,therefore,a process of desorption hardly occurs.p-type pyrite doped by arsenic is apt to form p-n junctions with n-type pyrite,which is the driving factors to result in electrochemical precipitation of gold complexes on pyrite surface.Gold adsorption experiments are currently conducted at conditions of supergene with temperatures < 90℃.Therefore,in the future,we should carry out adsorption metallogenic experiments at higher temperature and pressure conditions,especially combining with in-situ electrochemical approaches to investigate the influence of interface reaction between pyrite and gold complexes and galvanic effect on gold complexes reduction.
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