Some Organic Inhibitors Synthesis And Mechanism Research In Copper And Sulphur Separation

In the flotation separation process of copper sulphur ore, the traditional high calcium high alkali suppression method has many flaws, such as waste of resources, unsafe production process, environment pollution and so on. The organic inhibitors of pyrite in separation process of copper sulphur ore was synthetized according to the flotation reagents organic inhibitors molecular design theory,and inhibition mechanism was studied in this paper.The structure of the organic inhibitors is determined which was needed in this test according to the research on the relationship between molecular structure and performance of organic inhibitors, the organic inhibitors of three carboxyl methyl-two sodium carbonate is synthetized in the organic synthesis device from sodium citrate,carbon disulfide and sodium hydroxide; The influence of reaction temperature, reaction time and the mole ratio of reactants on the synthetic reaction is discussed;Determine whether the product is the target product by Near Infrared Spectroscopy.Use pyrite and chalcopyrite as flotation test objects separately, the depressing ability of the organic inhibitors was systematic investigated, then use three carboxyl methyl-two sodium carbonate as the organic inhibitor of pyrite, depressing ability of which was explored in the different flotation condition, Inhibition effect was compared with lime and humic acerbity natrium, at last, the artificial mixture of copper sulphur ore in different matching ratio was studied,the resulte showed:in the pH long range, the flotatablity of both pyrite and chalcopyrite is good,when pH>12,the flotatablity of pyrite is decreased, while chalcopyrite is not; Inhibitors concentration,pH and unavoidably ion all will affect the depressing ability of the organic inhibitor, when pH=9pyrite can be surpressed,which reduce the pH condition of copper sulphur;suppression effect of lime is best,then three carboxyl methyl-two sodium carbonate,the worst is humic acerbity natrium.pyrite and chalcopyrite can be separated effectively in low pH when this organic inhibitor was used,when matching ratio of pyrite and chalcopyrite is1:1,the result is best.The effect of three carboxyl methyl-two sodium carbonate on each kind of sulfide ore was studied according to the calculation of energy of the organic inhibitors and surface function energy between organic inhibitors and sulfide ore by computer molecular simulation platform. The result indicated that all the surface function energy between this organic inhibitor and each kind of sulfide ore is negative, however, the minimum is pyrite, and the maximum is chalcopyrite, the smaller the energy function, the stronger adsorption, so three carboxyl methyl-two sodium carbonate has certain inhibition ability to each kind of sulfide ore, the strongest is to pyrite, and the weakest is to chalcopyrite, which is in accordance with the single mineral test results.The action mechanism of three carboxyl methyl-two sodium carbonate on pyrite is studied by infrared spectrum and ultraviolet absorption spectroscopy:strong chemical adsorption can happen between organic inhibitors molecule and pyrite, pyrite is suppressed due to the multi-polar groups in the molecule which make pyrite hydrophilic; the surface adsorption quantity of organic inhibitors on each kind of sulfide ore increases with the increase of organic inhibitors concentration, and it’s more significant on the surface of pyrite, which is further indicated the adsorption ability of organic inhibitors is stronger in the surface of pyrite than other minerals.In the flotation separation test of actual copper sulphur ore,the application of this organic inhibitor can not only separate the pyrite and chalcopyrite in low pH, but also increase the recovery rate of associated gold and silver compared to the traditional lime process.