| A large number of copper sulfide minerals are contained in cyanide tailings of gold mines in China,and this part of copper sulfide minerals are difficult to recover due to the strong inhibition by cyanide,resulting in a waste of resources.And the study on the microthermokinetic of the inhibition and activation process of copper sulphide ore is still blank.In this paper,sodium hypochlorite,sodium metabisulfite,copper sulfate and hydrogen peroxide were chosen as four activators.A systematic study of the thermokinetic of the process of the inhibition and activation of chalcopyrite was carried out by microcalorimetry and validated by flotation test and XPS analysis.Calorimetric test results show that all the process of chemical action on mineral were exothermic reactions in this paper.The results of microthermokinetic of the process of inhibition of chalcopyrite show that in the lime pulping with high alkali environment,the apparent activation energy Ea and the apparent activation enthalpy ?H?? of the adsorption of butyl xanthate on the surface of pyrite was far higher than that of other environmental.Flotation test results showed the Ea and ?H?? of the adsorption of butyl xanthate on the surface of minerals were higher,then the recovery rate was lower.The sequence of the difference of the apparent activation energy,apparent activation enthalpy and flotation recovery rate between chalcopyrite and pyrite in different pulp environment was p H=12?lime?> pH=12?NaOH?>pH=7 >pH=2.And the parameter difference in the high alkaline pulp adjusted by lime was much higher than that in other conditions.It showed that only in the high alkaline pulp environment adjusted by lime,chalcopyrite and pyrite having an effectively separate.The Ea and ?H?? of the adsorption of butyl xanthate on the surface of chalcopyrite increased sharply after the effect of sodium cyanide,leading to the difficulty of adsorption was greatly increased.XPS analysis results showed that a large number of Cu?CN?2 formed on the surface of chalcopyrite after the action of sodium cyanide,resulted in a substantial increase in the concentration of N and a significant reduction in the concentration of S and S atomic ratio,and the chalcopyrite surface showed severe loss of sulfur.The results of microthermokinetic of the process of the activation of chalcopyrite inhibited by sodium cyanide showed that the sequence of the Ea and ?H?? of the activation of four activators was hydrogen peroxide < sodium hypochlorite < sodium metabisulfite < copper sulfate.The sequence of the Ea and ?H?? of the adsorption of butyl xanthate on the surface of chalcopyrite activated by four activators was just the opposite,and the Ea and ?H?? were significantly reduced.Flotation test results showed that all four kinds of activator could effectively activate the chalcopyrite inhibited by sodium cyanide,and the sequence of activation effect was copper sulfate > sodium metabisulfite > sodium hypochlorite > hydrogen peroxide.XPS analysis results showed that hydrogen peroxide and sodium hypochlorite could oxidize CN-,sodium metabisulfite could restore the CN-to SCN-and weaken CN-complexation with chalcopyrite surface,weak oxidizing copper sulfate could oxidized CN-to?CN?2 and reduce the content of CN- in pulp.The concentration of N on the surface of chalcopyrite significantly decreased and the atomic ratio of S and Fe were greatly picked up after activation.The sulfur loss condition of Chalcopyrite surface was greatly improved and atomic ratio of Fe,S on chalcopyrite surface were close to the state of pure chalcopyrite mineral.The sequence of atomic ratio of N on chalcopyrite surface was chalcopyrite inhibited by sodium cyanide > chalcopyrite activated by hydrogen peroxide > chalcopyrite activated by sodium hypochlorite > chalcopyrite activated by sodium metabisulfite > chalcopyrite activated by copper sulfate > chalcopyrite and the sequence of the atomic ratio of S was just the opposite.And the atomic ratio of S was consistent with Ea,?H?? and flotation recovery rate. |
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