Experimental Study of Gold and Platinum Solubility in a Complex Fluid under Hydrothermal Conditions
Experimental Study of Gold and Platinum Solubility in a Complex Fluid under Hydrothermal Conditions
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DOI：
10.1111/j.1751-3928.2000.tb00058.x
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发表时间：
2000-06
期刊：
影响因子：
1.4
通讯作者：
G. G. Likhoidov-G.;L. P. Plyusnina;J. Scheka;T. Eva
中科院分区：
文献类型：
--
作者：
G. G. Likhoidov-G.;L. P. Plyusnina;J. Scheka;T. Eva
摘要：在300- 500 ℃、1 Kb恒压条件下，研究了金在水和NaCl水溶液（1- 5 μ m）中的溶解度。使用两种缓冲液组合HMP和PPM。对log mAu-mNaCl-T框架中测量值的分散性进行分析，确定了log mAu和T之间在任何研究的等离子体（mNaCl）下的线性相关性，其形式为log mAu = a。T（C）+ B。水和NaCl（1，3，5米）的解决方案的方程的系数进行了计算。最大溶解度表征了HMP存在下的无NaCl系统。在这种情况下，Au溶解度从（log mAu）-6增加。72比-5 04分别在300和500 ℃下。在PPM的存在下，Au的溶解度最大获得5 mNaCl溶液。以类似的方式，溶解度从-6上升。54比-5 77在300和500 C，相应地。在所研究的fO 2/fS 2区域，Au溶解度的行为证明：（i）-氯化物和硫氢化物形态之间的复合相互作用影响金的总溶解度;（ii）-添加NaCl高达约1。5 m的溶解度下降，更显着的存在下的HMP;（iii）-的贡献，总Au溶解度的氯化物是更多的PPM，尽管较低的fO 2值，比HMP。
Abstract: The solubility of gold was studied in water and aqueous NaCl (1– 5 m) solutions under oxygen and sulfur buffered conditions between 300–500C at a constant pressure 1 kb. Two buffer assemblages HMP and PPM were used. Analysis of the scatter in measured values in log mAu–mNaCl–T frame fixed linear dependence between log mAu and T at any studied iso‐pleth (mNaCl) in the form of log mAu = a. T(C) + b. Coefficients of the equation were calculated for water and NaCl (1, 3, 5 m) solutions. The maximum solubility characterizes the NaCl‐free system in the presence of HMP. In the case, Au solubility increases from (log mAu) –6. 72 to –5. 04 at 300 and 500C, respectively. In the presence of PPM, maximum of Au solubility was obtained for the 5 mNaCl solution. In a similar manner solubility rises from –6. 54 to –5. 77 at 300 and 500C, accordingly. In studied fO2/fS2 area the behavior of Au solubility testified that: (i) – a composite interaction between chloride and hydrosulfide speciation of gold affects its total solubility; (ii) – in addition of NaCl up to about 1. 5 m the solubility decreases, more pronounced in the presence of HMP; (iii) – the contribution of chloride in total Au solubility is more for PPM despite of lower fO2value, than for HMP.