Flotation Separation Of Complicated And Mixed Copper-molybdenum Concentrates Of Tibet And Experimental Research Of Copper Ore Inhibitors

Flotation is the most effective separation method of the mixed copper-molybdenum concentrates.The thesis takes the complicated and mixed copper-molybdenum concentrates of Tibet as the research object.To devise flotation process,the mineral occurrence of mixed concentrates can be identified by the research of process mineralogy and the suitable flotation conditions can be got by a large of floatation tests.In order to reduce the problem of the big consumption of sodium sulfide inhibitors,this thesis explores the reasons for sodium sulfide inhibitors about oxygenate and decline the consumption by many flotation experiments with mixed depressants and other kinds of ones.Finally,the open-circuit flotation tests will be taken under the best flotation conditions.Technological mineralogy studies indicated that the mixed copper-molybdenum concentrates are made up of metal minerals and gangue minerals.Metallic minerals are mainly chalcopyrite,pyrite,bornite and molybdenite.Gangue minerals are quartz and feldspar.The grade of molybdenum is 0.58%,the same as copper is 25.90%.The degree of monomer separation is sufficient.There're a large number of fine grained chalcopyrite and bornite in molybdenum concentrates.To improve flotation effect,considering economic consumption and every flotation indexes,the best suitable dosage of depressant is sodium sulfide of 15 kg·t-1 dosage by taking different conditions and various inhibitors flotation experiments.The grade and recovery of its molybdenum concentrate is 20.8%and 87.67%.The result of sodium sulfide oxidation tests show that the high consumption of sodium sulfide is related to the action from chalcopyrite and molybdenum and blowing air in flotation process.When the mixed inhibitor which is composed of sodium sulfide of 10 kg·t-1 dosage and sodium thioglycolate of 15 kg·t1 dosage are used in flotation test,the recovery of rmolybdenum concentrate is 87.90%.Comparing with sodium sulfide depressant test of 15 kg·t1,the dosage of sodium sulfide fell by a third and 31.75%of depressants' use-cost are saved.On the basis of the best flotation condition,the open circuit experiment are taken,the molybdenum concentrate of grade 46.87%and recovery 67.34%are obtained.The grade and recovery of copper concentrate are 27.21%and 89.58%.The separation index of Copper-molybdenum mixed concentrate is good.