Kinetic study of the oxidation of pyrite in aqueous ferric sulfate.
Zheng-CQ; Allen-CC; Bautista-RG
Ind and Eng Chem Process Des and Dev 1986 Jan; 25(1):308-317
The oxidation of pyrite in aqueous ferric sulfate is given by the chemical reaction fes2 + 14fe3+ + 8h2o -> 15fe2+ + 2so42- + 16h+. It was found that the reaction was kinetically limited and the oxidation rate for the pyrite depended on the total iron concentration and on the ratio of ferric to ferrous ions under constant acid concentration. The experimental data were found to best fit the hougen-watson dual-site adsorption model for total fe(III) and total fe(II) ions with the rate expression given by rfes2 = k1 - k2[fe(II)]1/2[fe(III)]1/2 / 1/[fe(III)]1/2 + k3 + k4[fe(II)/fe(III)]1/2. It was also found that the rate of pyrite oxidation depended on the free ferric, free ferrous, and bisulfate ions when the sulfate concentration is varied.
OP; Journal Article
Industrial & Engineering Chemistry Process Design and Development
Iowa State Unversity,g65106002