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Antimony Solubility and Speciation in Aqueous Sulphuric Acid Solutions at 298 K
Author(s) -
Casas Jesús M.,
Crisóstomo Gloria,
Cifuentes Luis
Publication year - 2004
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450820122
Subject(s) - antimony , solubility , aqueous solution , chemistry , hydrogen peroxide , inorganic chemistry , solubility equilibrium , genetic algorithm , metal , equilibrium constant , organic chemistry , evolutionary biology , biology
This work is an experimental and theoretical study of antimony speciation and the solubility of Sb 2 O 5 , Sb 2 O 3 and Sb 2 (SO 4 ) 3 at 298 K in aqueous sulphuric acid solutions (0 to 6 kmol/m 3 ). A thermodynamic model was developed to quantify the solubility products and aqueous metal speciation. Main dissolved species were H 3 SbO 3(aq) and H 3 SbO 4(aq) . The solubility of antimony increases with increasing solution acidity and with the presence of hydrogen peroxide in the solution. The following standard equilibrium constants at 298 K were obtained: Log K 0 (Sb2O5) = 11.7±0.5, Log K 0 (Sb2O3) = 32±1, and Log K 0 (Sb2(SO4)3) = 55±2.