Screening of Chalcocite Inhibitor and Its Interaction Mechanism Study in Copper-molybdenum Separation
In the process of copper-molybdenum separation,chalcocite is difficult to be inhibited,which often leads to the problem of excessive copper in molybdenum concentrate.From the perspective of strong bonding ability between inhibitors and cuprous ions on the surface of chalcocite,nine inhibitors were screened and their effects on the flotation behavior of chalcocite and molybdenite were explored.The mechanism of potassium ferricyanide inhibiting chalcocite was analyzed by means of ad-sorption capacity,contact angle,zeta potential and XPS.The results show that the order of the inhibition effect of nine reagents on chalcocite from strong to weak is potassium ferricyanide,potassium ferrocyanide,disodium ethylenediamine tetraacetate,so-dium hydrosulfide,dicyandiamide,ammonium thioglycolate,aminoacetic acid,ammonium thiocyanate,L-aspartic acid.Among them,potassium ferricyanide has the best inhibition effect and has little effect on the floatability of molybdenite.Potassium fer-ricyanide can effectively adsorb onto the surface of chalcocite,resulting in a significant decrease in the hydrophobicity and elec-tronegativity of the surface of chalcocite.After adding potassium ferricyanide,the CuO component on the surface of chalcocite is greatly reduced,and Cu(OH)2 is formed,and the relative contents of Fe3+and Fe2+are 18.36%and 81.64%,respectively.The mechanism of action of potassium ferricyanide is that a large amount of ferricyanide ions released by potassium ferricyanide hydrolysis are competitively adsorbed on the surface of chalcocite to form cuprous hexacyanoferrate precipitation,and with the redox reaction,cuprous hexacyanoferrate and copper hydroxide are formed.These hydrophilic precipitates are firmly adsorbed on the surface of chalcocite to inhibit chalcocite.
copper-molybdenum separationchalcociteinhibitormechanism of action
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