Antimony in hydrothermal processes: solubility, conditions of transfer, and metal-bearing capacity of solutions
Antimony in hydrothermal processes: solubility, conditions of transfer, and metal-bearing capacity of solutions
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DOI：
10.1016/j.rgg.2007.11.006
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发表时间：
2007-12
影响因子：
1.1
通讯作者：
A. Obolensky;L. Gushchina;A. Borisenko;A. Borovikov;G. Pavlova
中科院分区：
文献类型：
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作者：
A. Obolensky;L. Gushchina;A. Borisenko;A. Borovikov;G. Pavlova
根据矿石矿物流体包裹体研究中获得的含矿热液成分和各种锑及含锑矿床成矿作用参数数据，研究了Sb（III）在Sb-Cl-H_2S-H_2 O体系中的行为，并对自然锑和辉锑矿在硫化物中的溶解进行了热力学模拟（mHS−= 0.0001−0.1）和氯化物（mCl−= 0.1−5）溶液以及Sb（s）0和Sb 2S 3（s）在硫化物-氯化物溶液（mHS−= 0.01; mCl−= 1）中的联合溶解取决于Eh、pH和温度。所有热力学计算均使用Chiller计算机程序进行。在上述条件下，辉锑矿在酸性、弱酸-中性和中等氧化还原条件下沉淀，而在中性-碱性条件下，自然锑在辉锑矿沉淀之前沉淀。预测了不同成分和来源的热液（200-250 °C）的含金属量。我们已经确定，最高的容量是特定于酸性（pH = 2-3）高氯化物溶液中的硫化物硫和碱性（pH = 7-8）低氯化物低硫化物溶液。
Based on data on the composition of ore-bearing hydrothermal solutions and parameters of ore-forming processes at various antimony and antimony-bearing deposits, which were obtained in studies of fluid inclusions in ore minerals, we investigated the behavior of Sb(III) in the system Sb–Cl–H2S–H2O describing the formation of these deposits.We also performed thermodynamic modeling of native-antimony and stibnite dissolution in sulfide (mHS−= 0.0001−0.1) and chloride (mCl−= 0.1−5) solutions and the joint dissolution of Sb(s)0and Sb2S3(s)in sulfide-chloride solution (mHS−= 0.01; mCl−= 1) depending on Eh, pH, and temperature. All thermodynamic calculations were carried out using the Chiller computer program. Under the above conditions, stibnite precipitates in acid, weakly acid to neutral, and medium redox solutions, whereas native antimony precipitates before stibnite under more reducing conditions in neutral to alkaline solutions.The metal-bearing capacity of hydrothermal solutions (200–250 °C) of different compositions and origins has been predicted. We have established that the highest capacity is specific for acid (pH = 2–3) high-chloride solutions poor in sulfide sulfur and alkaline (pH = 7–8) low-chloride low-sulfide solutions.