Study on bonding mechanism between sillimanite and collectors by quantum chemistry calculation

Abstract

The charge distribution of ions in sillimanite crystal, diatomic energy, and the heat of absorption of sillimanite on collectors such as sodium oleate, sodium dodecyl sulfonate, and tetradecyl amine are evaluated in the light of quantum chemistry CNDO/2 method. According to the calculating results, the bonding mechanism between mineral and collectors is analyzed. It is demonstrated that sodium oleate is adsorbed on sillmanite surface chemically; however, in the case of sodium dodecyl sulfonate, it is of physic-adsorption. At the same time a good prediction was made on the collective power of collectors as in the following order:sodium oleate>tetradecyl amine>sodium dodecyl sulfonate. This order has been confirmed by the testing results of flotation.

Keywords

sillimanite / sodium oleate / sodium dodecyl / sulfonate / tetradecyl / amine / flotation / CNDO/2

References

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