Removal of Ca2+ and Mg2+ Ions from Complex Sulfide Flotation Waters by Sodium Carbonate Additions
DOI:
https://doi.org/10.36790/epistemus.v17i34.255Keywords:
Calcium, Magnesium, FlotationAbstract
Ca2+ and Mg2+ ions are present in the water of the sulfide flotation process, negatively affecting its floatability and grade of the final concentrates obtained. It has recently been reported that its removal by adding sodium carbonate (Na2CO3) has a beneficial effect on flotation, although the reasons for this behavior are not yet known in detail. This paper presents the results of a study designed to investigate the reaction mechanism between the metal-carbonate ions. The results show that the addition of Na2CO3 to a saturated gypsum solution (0.016 mol/L) containing 50 ppm Mg(II) promotes the precipitation of the Ca2+ ion, such as calcite and vaterite. The kinetic model proposed to describe the reaction’s kinetics suggests that it is about a second order kinetic.
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