Study on Process and Reagent Interaction Mechanism in Low Grade Collophanite Flotation

摘要

According to the difficulty of dolomite removal from coliophanite, normal-reverse floatation process has been adopted in floatation with the use of highly selective collector G-4 and depressant S721. Good indexes of flotation have been obtained with the run-of-mine ore containing 17.96 %P2O5 and 2.31% MgO being upgraded to a concentrate containing more than 30% P2Os and less than 1% MgO. The reagent interaction mechanism in low grade collophanite flotation has been studied by FTIR analysis and theoretical calculation. The results indicate that the interaction between collector G-4 and collophanite is the result of chemical adsorption in combination with physical adsorption with chemical adsorption playing the major role. Depressant S721 adsorbs on dolomite surface to form a water film and effectively depresses the flotation of dolomite and reduces the MgO content in the concentrate.