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- W2490454927 abstract "A pneumatically mixed flow-through reactor was used to study the oxidation kinetics of pyrite and pyrrhotite. Experiments were conducted at pH values of 2, 3, 4, and 6 with temperatures controlled at 10, 22, and 33°C. A grain-size fraction with an average particle diameter of 105 microns was used in all experiments. The rates of pyrrhotite oxidation ranged from 6 to 14 x 10-9 mol·m-2s-1 at 22°C for solution pH values of 2 to 6. Although the rates were not strongly pH-dependent, minimum values were observed for pH values of 3-4. Experimental activation energies were approximately 50 kJ·mol-1 at pH values of 2 and 4, but in excess of 100 kJ·mol-1 at pH=6. The molar ratio of SO42-/Fe in the reactor effluent varied from 0.93 at pH=2 to 0.76 at pH=6, suggesting a preferential retention of sulfur on the pyrrhotite solids with increasing pH. The rates of pyrrhotite oxidation at atmospheric concentrations of O2 and at 22°C were on the order of 100 times those measured for pyrite. The iron deficiency in pyrrhotite is considered the major factor for these high rates." @default.
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- W2490454927 date "1993-12-20" @default.
- W2490454927 modified "2023-10-14" @default.
- W2490454927 title "Laboratory Studies of Pyrrhotite Oxidation Kinetics" @default.
- W2490454927 doi "https://doi.org/10.1021/bk-1994-0550.ch002" @default.
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