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- W2034207165 abstract "Abstract The kinetics of precipitating alunite (KAl3 (SO4)2(OH)6) from manganese sulphate solutions containing 0.2 g/l potassium was evaluated at different temperatures (80–95°C), controlled solution pH's (2.5–3.5) and aluminium/potassium (Al/K) molar ratios ( 3 1 6 1 and 9 1 ). The experimental data fit a second-order kinetic model which shows two regions of precipitation with rate constant dependent on the precipitation parameters. At the stoichiometric Al/K ratio of 3, the variation of rate constants with temperatures from 80–95°C yields activation energies of 58.5 and 43.2 kj/mol for the initial induction stage and the subsequent crystal growth respectively. At Al/K molar ratios of 6 and 9, the activation energies are 110 and 132 kJ/mol for the two stages of precipitation. Seeding the solutions with alunite crystals before the precipitation (at 5 and 10 g/l) decreases the induction period and improves the kinetics significantly. An increase of sulphate concentration also improves the crystal growth rate." @default.
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- W2034207165 date "1991-07-01" @default.
- W2034207165 modified "2023-09-27" @default.
- W2034207165 title "Kinetic study on the precipitation of alunite from manganese sulphate solutions" @default.
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- W2034207165 doi "https://doi.org/10.1016/0304-386x(91)90080-6" @default.
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