流体混合作用导致金沉淀机理的实验研究

曾键年; 范永香

流体混合作用导致金沉淀机理的实验研究

曾键年^1,,
范永香²

1.
中国地质大学汉口分校, 湖北武汉 430030
2.
中国地质大学资源学院, 湖北武汉 430074

基金项目:

教育部高等学校博士学科点基金资助项目 9549112

详细信息

作者简介:
曾键年(1956-), 男, 教授, 1998年毕业于中国地质大学(武汉), 获博士学位, 主要从事矿床学及矿产勘查科研和教学工作.E-mail: zengjn@public.wh.hb.cn

中图分类号: P611.5;P618.51
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出版历程
- 收稿日期: 2001-06-27
- 刊出日期: 2002-01-25

Experiments of Mechanisms of Gold Precipitated by Fluid-Mixing Function

CENG Jian-nian^1
,,
FAN Yong-xiang²

1.
Hankou Campus, China University of Geosciences, Wuhan 430030, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 为了研究流体混合作用导致金沉淀的两种主要机理, 通过简化实验体系、分离影响因素, 分别设计了降温、盐度变化导致金沉淀的模拟实验.研究表明:(1)随温度降低溶液的金溶解度也随之降低, 二者之间呈现一种复杂的函数关系; 在300 ℃左右的温度段, 是金沉淀的一个很有地质意义的温度区间;(2)含金流体盐度的降低, 引起流体中金的配位基浓度降低, 导致金沉淀;(3)岩石中发生碱交代有利于金定位富集
- 流体混合作用 /
- 金沉淀机理 /
- 模拟实验
Abstract: Simulate experiments of gold precipitated by lowering temperature and changing salt-content are designed by simplifying experimental system and separating influential factors in order to study two main mechanisms of gold precipitated by fluid-mixing function. The study shows first of all that the Au content in solution is lower with the falling temperature of solution, with a kind of complex functional relationship between them, and 300 ℃ as the most significant temperature in geology for gold mineralization.Second, lowering the salt content of the Au-fluid reduces the content of complex foundation, and lead to the gold precipitating. Third, the alkalic metasomatism in the rock is beneficial to gold mineralization.
- fluid-mixing function /
- mechanism of gold precipitation /
- simulate experiment

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图 1 0.1 ml/L HCl溶液中金溶解度拟合曲线^[1]

Fig. 1. Curve of gold solubility in 0.1 ml/L HCl solution

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图 2 NaCl-H₂O体系中金溶解度拟合曲线^[1]

Fig. 2. Curve of gold solubility in NaCl-H₂O system

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图 3 残液金质量分数与沉淀温度关系曲线

Fig. 3. The relationship curve of gold mass fraction and precipitating temperature in surviving solution

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图 4 NaCl浓度-金沉淀量拟合曲线

Fig. 4. Relationship curve of precipitating-gold mass fraction and NaCl mass concentration

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表 1 不同温度下溶液中金的沉淀实验

Table 1. Experiments of gold precipitating in solution under different temperatures

表 2 不同NaCl质量浓度溶液中金的沉淀实验

Table 2. Experiments of gold precipitation in solution under different NaCl mass concentrations

参考文献(11)

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