Effect of Phosphate on Flotation Separation of Smithsonite and Dolomite
The difference in floatability between smithsonite and dolomite is small in the system with dodecyllamine as collector,and it is difficult to separate by flotation.The effects of sodium tripolyphosphate,sodium pyrophosphate and sodium hmetaphosphate on the flotation of smithsonite and dolomite were studied by single mineral flotation experiment.The results show that when the dosage of sodium tripolyphosphate is 30 mg/L,it has a strong inhibitory effect on dolomite and a weaker inhibitory effect on smithsonite,achieving selective inhibition of dolomite.The actual ore test results show that using 600 g/t sodium tripolyphosphate as a dolomite inhibitor,zinc concentrate with zinc grade of 36.49％and recovery of 75.49％can be obtained by flotation separation,and the effective separation of smithsonite and dolomite can be realized.The inhibition mechanism of sodium tripolyphosphate on dolomite was discussed by Zeta potential test and adsorption capacity test.The results show that sodium tripolyphosphate can significantly affect the adsorption of the collector dodecyllamine on the surface of dolomite,but has little effect on the adsorption of smithsonite,which increases the adsorption difference of the collector on the surface of smithsonite and dolomite,resulting in the difference in the floatability between smithsonite and dolomite.
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