| During flotation copper-molybdenum ore, separation of copper from molybdenum is known as a big problem, being based on which a reasonable new techenology of separation and potential control flotation (PCF) is proposed in this paper.Influence of Potential modifier Sodium sulfide, ammonium sulfate, sodium carbonate on chalcopyrite flotation and depress of mercaptoacetic acid on chalcopyrite flotation were inverstigated by experimenting, Kerosene acted as collector. Mechanism of PCF of chalcopyrite was studied by determinating slurry potential and calculating thermodynamics and electrochemical cyclic voltammetry scanning combine with Micro high-speed photography. Under the help of flotation solution computational chemistry, Molecular structure simulation, IR mechamism of mercaptoacetic acid depress chalcopyrite flotation was researchee exactly.Meanwhile, effective of PCF-symbiotic copper-molybdenum was analysied clearly.According to experimental results, a novel PCF-symbiotic copper-molybdenum and separation was developed. The open and closed experiments indicated that after PCF and fine separation good results could obtained as follow:18.03% copper concentrate enriched to 85.92%, 25.63% Molybdenum concertrate enriched to 64.4%.Experimental results indicated that by adjusting pH and potential of slurry, in the presence of frother only, PCF of chalcopyrite can achieve as responsibility of its natural hydrophobic.The maxmum recovery reached at pH 8 and potential 360mV. Low sodium sulfide concentration can activate its PCF, capability of these modifer followed the following order:sodium sulfide> sodium carbomate> ammonium carbonate.The mechanism of PCF of chalcopyrite include two step. Firstly elemental sulphur formed in particle surface via oxidation resulting in hydrophobic surface; secondly surface of chalcopyrite concentrate became hydrophobic because of the effect of buoyant CuS formed in system combining with elemental sulphur. Mercaptoacetic acid had a good depression on chalcopyrite flotation in slurry pH 9-10, pulp potential less than 350mV, especially coopetating with sodium sulfide,which can decrease the recovery of chalcopyrite flotation tremendously but not affect molybdenite flotation.thereforce, perfect selective separation can carry out in the copper-molybdenum flotation. Mercaptoacetic acid depress chalcopyrite flotation in terms of intensive absorption of HSCH2COO- to surface of chalcopyrite leading to a stable Hydrophilic layer cover on it. |
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