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The Oxidation of Fe(II) in Acidic Sulfate Solutions with Air at Elevated Pressures: Part 1. Kinetics above 1 M H2SO4

Wermink, W. N. & Versteeg, G. F., 12-Apr-2017, In : Industrial and Engineering Chemistry Research. 56, 14, p. 3775-3788 14 p.

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DOI

The oxidation of ferrous ions in acidic sulfate solutions at elevated air pressures was investigated. The effect of the Fe2+ concentration, initial H2SO4 concentration and partial oxygen pressure on the reaction rate were determined at three different temperatures, that is, T = 90, 70, and 50 degrees C. The effect on the reaction rate of the components that H2SO4 dissociates into, that is, HSO4-, H3O+, and SO42-, was established as well. A second order of reaction in Fe2+ and a first order of reaction in O-2 were determined. No clear order in either H2SO4 or the components H2SO4 dissociates into, could be established. For the.experiments with initial concentrations of H2SO4 of 1 M and higher the oxidation rate was not affected, that is, a zero order of reaction in H2SO4 for these concentrations. Therefore, the kinetic rate expression for the oxidation of Fe2+ at concentrations of H2SO4 of 1 M and higher can be calculated with R-Fe(2+) = d[Fe2+]/dt = k[Fe2+]P-2(O2), where the activation energy E-A was determined to be 60.3 kJ/mol.

Original languageEnglish
Pages (from-to)3775-3788
Number of pages14
JournalIndustrial and Engineering Chemistry Research
Volume56
Issue number14
Publication statusPublished - 12-Apr-2017

    Keywords

  • AQUEOUS SULFURIC-ACID, MOLECULAR-OXYGEN, FERROUS SULFATE, TEMPERATURES, MODEL, ABSORPTION, REMOVAL, IONS

ID: 46893963