矿物吸附金的实验研究及其在红土型金矿形成中的意义

王燕; 谭凯旋; 刘顺生; 陈梦熊

Volume 28 Issue 1

Jan. 2003

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WANG Yan, TAN Kai-xuan, LIU Shun-sheng, CHEN Meng-xiong, 2003. Experimental Study of Gold Adsorption by Minerals and Its Signification in Forming of Lateritic Gold Deposits. Earth Science, 28(1): 26-30.

Citation:

WANG Yan, TAN Kai-xuan, LIU Shun-sheng, CHEN Meng-xiong, 2003. Experimental Study of Gold Adsorption by Minerals and Its Signification in Forming of Lateritic Gold Deposits. Earth Science, 28(1): 26-30.

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Experimental Study of Gold Adsorption by Minerals and Its Signification in Forming of Lateritic Gold Deposits

1.
Changsha Institute of Geotectonics, Chinese Academy of Sciences, Changsha 410013, China
2.
Guangdong Non-ferrous Metal Geological Survey Institute, Guangzhou 510080, China
3.
China Non-ferrous Metals Resources Geological Survey, Beijing 100814, China

Received Date: 2002-01-10
Publish Date: 2003-01-25

Abstract

Abstract

Gold (Ⅲ)-chloride and gold (Ⅰ)-thiosulfate adsorption by various minerals and ores were experimented and studied in the paper. The adsorption of AuCl₄^- by minerals is much higher than Au(S₂O₃)₂^3-. The adsorption is montmorillonite > kaolinite > illite for clay minerals, and pyrite > goethite > limonite for iron-bearing minerals. H₂O₂ containing in meteoric water is a catalyst for oxidation or reduction of gold, pyrite and other minerals, so that it can speed up weathering process and Au dissolution and migration under supergene conditions. The meteoric water can, to some extent, leach gold in laterite, and the leaching capacity is controlled by compositions of the leached rocks and minerals. Meteoric water, KCl, oxalic acid, citric acid, hypo and other solutions are also able to leach some gold in laterite, but their leaching capacities are quite different from one another even for same sample. The lateritic gold deposits were produced under the acidic, oxidizing and Cl^-, SO₄^2- rich hydro-geochemical environment. Gold migrated as sulpho-sulphate complex, chloride complex and their hydrates and the key factors were the oxidation of sulpho sulphate complex anions and the subsequent reduction in the lower part of the weathering crusts to make Au-bearing complexes unstable and then to make the released gold concentrated, precipitated or absorbed by other minerals. The adsorption of gold by minerals plays an important role during minerogenetic process of lateritic gold deposits.
- adsorption on mineral surface,
- Au(Ⅲ)-chloride,
- Au(Ⅰ)-thiosulfate,
- lateritic gold deposits

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References(12)

References

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