THE EFFECT OF DISPERSANT REAGENTS ON THE SODIUM OLEATE ADSORPTION AT THE SALT MINERALS-WATER INTERFACE

The influence of some dispersant reagents on the sodium oleate adsorption on the salt minerals surface has been investigated at the vicinity of pH 10. The presence of sodium lignin sulfate and low molecular weight acrylic polymer Cataflot P-40 caused the decrease of surfactant adsorption in the low concentration region of sodium oleate. On the other hand, the addition of 1000 g/t of polyethylene oxide (MW 200 000) did not cause such a change. The special shape of the adsorption isotherms has been done by the bidimensional concentration of alkaline earth metals soaps on the carbonate minerals surfaces. The vertical steps of isotherms were shifted to the high sodium oleate concentration region when both sodium lignin sulfate and Cataflot P-40 were added to the dolomite and magnesite suspensions. This effect was not observed for the calcite-sodium oleate system. The discrepancy was explained by Die blockade of magnesite species by these dispersant reagents. Changes in electrokinetic and stability behavior of these systems have been correlated with the precipitation conditions of both calcium and magnesium oleate.