纳米金的迁移富集与黄铁矿富金关系  

TRANSPORT AND ENRICHMENT OF NANOMETER SIZED GOLD IN RELATION TO GOLD RICH PYRITE

作　　者：姜泽春[1] 章振根[1] 莫德明[1] 陈大梅[1] 

机构地区：[1]中国科学院贵阳地球化学研究所

出　　处：《矿产与地质》1998年第6期367-371,共5页Mineral Resources and Geology

基　　金：自然科学基金

摘　　要：黄铁矿是金矿床中常见的矿物，也是重要的载金矿物之一，有的黄铁矿富金，有的黄铁矿不含金或含微量金。为什么黄铁矿对纳米金的吸附作用强？讨论了纳米微粒金与黄铁矿的关系后指出，半导体型黄铁矿有Ｎ型和Ｐ型两种。前者具负热电动势、带负电；后者具正电位带正电荷。当其与ＳｉＯ２水溶液迁移时，若与带正电荷的Ｐ型黄铁矿相遇，即被Ｐ型黄铁矿吸附沉淀成矿。带负电荷的黄铁矿不能吸附带负电荷的纳米金，因而不能成矿。Pyrite is a common mineral in gold ore deposits and one of the important gold rich minerals.Some pyrites are rich in gold and other contain no or a trace amount of gold.Why does pyrite have such a strong capacity of adsorbing nanometer sized gold? The paper discusses the relation between nanometer sized gold and pyrite,it points out that there are two types of semiconductive pyrite:N pyrite and P pyrite.The former with negative charge is possessed of negative thermoelectromotive force;the latter with positive charge is possessed of the positive thermoelectromotive force.When nanometer sized gold is transported with aqueous solution of silicondioxide and encountered with P pyrite,it will be adsorbed on pyrite,followed by ore deposition.N pyrite with negative charge can not adsorbnanometer sized gold with negative charge,and therefore no gold deposition would occur.

关 键 词：纳米金 黄铁矿 地球化学 金矿床 迁移富集 

分 类 号：P618.510.1[天文地球—矿床学] P618.510.4[天文地球—地质学]