Abstract
The purpose of the present investigation was to examine solubilities of arsenic compounds and to determine parameters of arsenic selective precipitation from chloride solutions of complicated composition. The following arsenic-containing systems were examined. MClm-HCl-CaCl2-H2S-H2O precipitation of As2S3 MClm-HCl-CaCl2-SnCl2-H2O precipitation of As MClm-HCl-CaCl2-Ca(OH)2,CaCO3-H2O precipitation of Mm(AsO3) n M = As, Sn, In, Pb, Bi, and Fe (metals present in solutions simultaneously). The free energy minimization method has been applied to determine an equilibrium composition of liquid, solid, and gaseous phases of multicomponent systems. The computations have been performed according to the program-package SELECTOR. Thermodynamic data for a number of Sn, Pb, In, and As sulfides, Chlorides and hydroxides, required for computations were obtained or precised by solving the so-called inverse problem; thermodynamic properties were computed on the basis of experimental solubility data for simple systems. The obtained thermodynamic data have been used in simulating industrial hydrometallurgical processes. Physico-chemical simulation resulted in determination of equilibrium phase composition of multisystems and the composition of each phase. It revealed the effect of hydrochloric acid, metals, chloride-ions concentrations as well as gaseous components partial pressure and temperature on solubility of As, Sn, In, Pb, Bi, and Fe compounds. In particular, the solubilities and stabilities of metal arsenates, chlorides, sulfides, carbonates, hydroxides, and oxides were predicted. Model analysis also made it possible to obtain quantitative characteristics on metals and arsenic speciation in aqueous solutions depending on pH. Eh, and chloride ion concentration. Parameters providing selective arsenic removal from chloride solutions comprising tin, lead, indium, and some other metals were determined with high extent of reliability.
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