Abstract
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 language | English |
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Pages (from-to) | 3775-3788 |
Number of pages | 14 |
Journal | Industrial and Engineering Chemistry Research |
Volume | 56 |
Issue number | 14 |
DOIs | |
Publication status | Published - 12-Apr-2017 |
Keywords
- AQUEOUS SULFURIC-ACID
- MOLECULAR-OXYGEN
- FERROUS SULFATE
- TEMPERATURES
- MODEL
- ABSORPTION
- REMOVAL
- IONS