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.