Study On The Effect Of Interaction Between Pyrrhotite And Chalcopyrite On Their Flotation Behavior

Due to the uncertainty of its crystal structure and oxidation and dissolution characteristics of pyrrhotite,the existence of pyrrhotite will interfere with the flotation of other metal sulfide ore,affecting copper-lead-zinc sulfide,pyrrhotite and pyrite The separation of ore restricts the comprehensive utilization of copper-sulfur mineral resources.Therefore,it has very important theoretical and practical significance to carry out research on the interaction mechanism of flotation between pyrrhotite and copper sulfide ore.In this paper,through the single mineral flotation test of two kinds of pyrrhotite and chalcopyrite,and the flotation test of pyrrhotite and chalcopyrite after interaction,the butyl xanthate system and the Z-200 system are used to study the activation The influence of copper sulfate and lime on the flotation behavior of two minerals.The interaction mechanism between pyrrhotite and chalcopyrite was studied by using the measurement and analysis methods of adsorption,X-ray photoelectron spectroscopy and infrared spectroscopy.The single mineral flotation test results show that the flotation recovery rates of monoclinic pyrrhotite and hexagonal pyrrhotite under strong acid conditions are very low,and the recovery rate is the highest in the range of pulp pH of 6?10.The recovery rate of pyrite is higher than that of hexagonal pyrrhotite in the pH range of 4?10;the recovery rate of chalcopyrite is relatively low when the pH is less than 4,and the recovery rate is the highest when the pH is8?10.The floatability of the two pyrrhotites activated by copper sulfate is enhanced,the floatable pH range becomes larger,and the difficulty of inhibition increases.Lime has no obvious effect on the floatability of monoclinic pyrrhotite and chalcopyrite,and has a certain inhibitory effect on hexagonal pyrrhotite.Under the butyl xanthate system,the flotation recovery rates of monoclinic and hexagonal pyrrhotite after interaction with chalcopyrite in the pH range of 4?12 are increased by 6%?10%and 5%?20%,respectively.,The recovery rate of chalcopyrite under the influence of monoclinic and hexagonal pyrrhotite decreased by 10%to 16%and 4%to 11%,respectively.Under the Z-200 system,the recovery rates of monoclinic and hexagonal pyrrhotite affected by chalcopyrite in the pH range of 4-12 are increased by 4%?12%and 2%?7%,respectively.,The recovery rate of chalcopyrite under the influence of hexagonal pyrrhotite has dropped by6%to 11%and 2%to 5%respectively.In the two collector systems,for the monoclinic pyrrhotite after interaction with chalcopyrite and the pyrrhotite after interaction with pyrrhotite,the floatability of the two is basically not affected by the amount of lime.When the amount of lime is 2.5×10^-3mol/L,the recovery rate of hexagonal pyrrhotite that is not affected by chalcopyrite is 27%,and the recovery rate of hexagonal pyrrhotite that is affected by chalcopyrite increases to 59%.According to the measurement results of the amount of Cu dissolution on the surface of chalcopyrite and the adsorption amount of butyl xanthate,it can be seen that the amount of Cu dissolution in the range of pH 4?12 for chalcopyrite after interaction with monoclinic and hexagonal pyrrhotite The reduction is 20mg/L?29mg/L and 11mg/L?22mg/L respectively;when the amount of Cu²⁺is increased from 0 to 2.5×10^-4mol/L,the yellow after the action of monoclinic and hexagonal pyrrhotite The adsorption capacity of copper ore on butyl xanthate increased from 0.31 mg/L and 0.27 mg/L to 0.38 mg/L and 0.37 mg/L,respectively.The results of infrared spectroscopy analysis show that the absorption peaks at-CH₃ and-CH₂-are significantly enhanced in the IR spectra obtained by the interaction of monoclinic and hexagonal pyrrhotite affected by chalcopyrite and butylxanthate.The results of XPS analysis and scanning electron microscopy before and after the interaction of pyrrhotite and chalcopyrite show that the surface dissolution of monoclinic and hexagonal pyrrhotite after interaction with chalcopyrite is intensified,the surface becomes rough and uneven,and the S2p binding energy Decrease,the concentration of S element increases,the surface may generate hydrophobic substances S⁰,etc.,the fine particles adsorbed on the surface of chalcopyrite after interaction with pyrrhotite increase,the binding energy of Fe2p increases,the concentration of Fe element increases,and the surface Hydrophilic Fe hydroxides and the like may be generated.It can be concluded that the increased floatability of pyrrhotite affected by chalcopyrite is due to the Cu²⁺adsorbed on its surface which increases the amount of butylxanthate adsorbed on it,and on the other hand,it is due to the formation of hydrophobic substances on the surface.S⁰:The drop in floatability of chalcopyrite affected by pyrrhotite may be caused by the formation of hydrophilic Fe hydroxide on its surface.