Activation Flotation And Mechanism Of Chalcopyrite And Marmatite Inhibited By Cyanide

In the field of gold production, cyanide tailings contain large valuable elements, the potential of comprehensive recycling utilization of resources is tremendous, in the process of precious metals leaching, the theory study is in-depth on the variation of copper&zinc sulfide flotation performance.C yanide was destroyed in the process of activation flotation cyanidation tailings, the environment pollution by the toxic cyanide was reduced. The background is to recycle sulphide ore from the cyanide tailings, the tests of flotation, flotation after the processing of simulation leaching of precious metals by cyanide, activation flotation was respectively arranged through selecting pure minerals chalcopyrite and marmatite. Througe analyzing the differences of the flotation recovery rate and the effect of sodium cyanide and activators, a variety of effective activators was found out. With the help of testing instruments, such as infrared spectrometer, Zeta potentio meter, combined with the calculation of solution chemistry of flotation to analyze the mechanism of activation and inhibition.Analyzing the activational flotation rate differences through flotation dynamics simulation of chalcopyrite and marmatite activated by different dosage of activators, giving theoretical guidance for separating chalcopyrite and marmatite at recovery.The floatation test shows chalcopyrite and marmatite can be strongly inhibited by sodium cyanide. The amount of sodium cyanide consumed by chalcopyrite is 2 times more than marmatite.In aerobic conditions, chalcopyrite has activation effect to itself after leaching in a certain range.Electrochemical calculation and IR test shows t he main inhibition components is Cu(CN)42-, Zn(CN)42- and Fe(CN)64-. the generated potentials of C u(CN)42-, Zn(CN)42- and Fe(CN)64- are lower than the corresponding butylxanthate salt in alkaline solution. CN- was chemically adsorbed on the surface of chalcopyrite and marmatite.Four effective activators were found after active flotation test. C halcopyrite and marmatite flotation recovery rate firstly increases and then decreases with the increase of activator dosage of sodium hypochlorite and hydrogen peroxide; rapidly and then slowly increases with the increase of dosage of sodium pyrosulfite and copper sulfate. Sodium hypochlorite and hydrogen peroxide are strong oxidizers, these reduction potential is far higher than the oxidation potential of the CN-. CN-is prior oxidized, then element S in the sulphide ore can be oxidized. Sodium metabisulfite is strong reductant. Infrared spectroscopy tests show that CN– can be reacted into the SCN- through the action of sodium metabisulfite. Complexing capability with metal ions on the surface of minerals.Thus, chalcopyrite and marmatite can be activated.Butyl xanthate is prior to adsorbe on the surface of minerals by competitive adsorption. The reaction speed is slow, not less than 10 min of the activation time are needed. Cu2+ have weaker oxidation ability, CN- can be oxidized to(CN)2. Unavoidable ion CN- can be consumed by copper sulfate, so it has activation performance. Cu2+ can be pior to adsorpted on the surface of marmatite when concentration of Cu2+ and Zn2+ is same.So the excess Cu2+ can activate marmatite.The law of marmatite and chalcopyrite activated flotation rate were KCu SO4>KNa Cl O>KH2O2>KNa S2O5, cumulative flotation recovery εCu SO4>εNa2S2O5>εH2O2、εNa Cl O exists when activator dosage is appropriate.Sodium pyrosulfite as activator, the second model fitting result the flotation rate constant of KCu>KZn.Copper sulphate activator dosage 1.67×10-4mol/L, chalcopyrite and marmatite activation flotation dynamics model fitting the flotation rate respectively 15.12 and 1.26, flotation time 1min, chalcopyrite recovery rate reached 91%, compared marmatite to 25%.Choosing sodium pyrosulfite as activator is better when cyanide tailings was seriously oxidated and contain one of chalcopyrite or marmatite.using the right amount of copper sulphate as activator is better when chalcopyrite and marmatite need activation flotation separation.