Abstract
The effects of the surface and solution chemistry of the Fe(II) and Fe(III) ions on the flotation of both ore- and coal-pyrite with xanthate have been systematically investigated based on flotation results, zeta potential measurements and thermodynamic calculations. It was found that the presence of ferrous and ferric ions in solution significantly depresses ore-pyrite flotation in the pH range of 6–9.5. The effect of ferrous ions is stronger than that of ferric ions. Coal pyrite was found to be nonfloatable above pH 6 due to the large amounts of ferrous ions resulted from pyrite oxidation. The results of thermodynamic calculations have been found to be in good agreement with the experimental results, indicating that the formation of ferric hydroxyl xanthate compounds are responsible for the reduced floatabilities of pyrites when pH is greater than 6.
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