Study On The Mechanism And Application Of Flotation Separation Of Galena And Jamesonite In High Alkali Pulp

:Galena and jamesonite are the main resources of antimony and lead. Due to the similar floatability, it is hard to achieve efficient separation result through conventional flotation technology. In order to solve the problem, pure mineral flotation, solution chemistry calculation, adsorption quantity, infrared spectroscopy, contact angle, cyclic voltammogram and Tafel tests were conducted to study the flotation separation of galena and jamesonite.Pure mineral flotation test was organized to research the effect of pulp pH value, dosage of Calcium hypochlorite, concentration of diethyldithiocarbamate and pulp potential on flotation behaviour of galena and jamesonite. Through the test, pulp pH value of11, Calcium hypochlorite dosage of1.2×10-5mol/L, diethyldithiocarbamate concentration of1.0×10-4mol/L and50mV pulp potential are considered as the optimum separation parameters.Solution chemistry calculation, adsorption quantity, infrared spectroscopy, contact angle results show that the inhibiting ability of Ca(C10)2, OH" and CaOH-on jamesonite is much stronger than that on galena. Diethyldithiocarbamate can chemically adsorbed on surface of galena and jamesonite and generate hydrophobic PbD2. However in high alkali pulp, especially in high alkali lime pulp, though DDTC still can strongly interact with galena, much more weakly with jamesonite.Cyclic voltammogram and Tafel tests suggest that interaction of DDTC with galena and jamesonite is a chemical process, high pH system is of little effect on galena surface chemical property and its interaction with DDTC. However, for jamesonite, due to itself oxidation, OH-and CaOH+adsorption, jamesonite surface will be covered by non-electroactivity hydroxy compound and low electroconductivity calcium compound which will hinder the electro transfer and make it hard for DDTC to adsorb on. Finally, in high alkali lime system, lead concentrate with the grade and recovery of Pb are72.09%and50.96%respectively, antimony concentrate with the grade and recovery of Pb are40.84%and37%respectively, Sb grade and recovery of10.89%and76.67%respectively were obtained.