ANTIMONY IN HYDROTHERMAL PROCESSES: SOLUBILITY, CONDITIONS OF TRANSFER, AND METAL-BEARING CAPACITY OF SOLUTIONS
A.A. Obolensky, L.V. Gushchina, A.S. Borisenko, A.A. Borovikov, G.G. Pavlova
Institute of Geology and Mineralogy, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Antimony; ore-forming systems; antimony species; metal-bearing capacity of solution; thermodynamic modeling
Pages: 992-1001
Abstract
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 (m HS- = 0.0001-0.1) and chloride ( m Cl- = 0.1 - 5) solutions and the joint dissolution of Sb0(s) and Sb2S 3(s) in sulfide-chloride solution ( m HS- = 0.01; m Cl- = 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
|
