Study On The Flotation Mechanism Of Sulfided Chrysocolla With Amine (ammonium) Salt

Chrysocolla,as a copper oxide mineral has poor floatability and it is often difficult to be separated from other minerals by using flotation method.Therefore,a deep understanding of flotation behavior and mechanism of chrysocolla will aid to improve flotation indexes of copper oxide ore containing chrysocolla.The present paper is subsidized by Natural Science Foundation of China"study on the mechanism of refractory copper sulfide flotation",and it aims to investigate the essence of the effect of combined ammonium-amine salt on chrysocolla flotation behavior,including the effect of combined ammonium-amine salt on flotation behavior of pure chrysocolla,the sensitization effect of xanthate adsorption on chrysocolla surface,the microstructure mutagenicity of chrysocolla surface and the micro-dissolution of chrysocolla surface.The prospective result will construct flotation mechanism of combined ammonium-amine salt on chrysocolla intensified sulfuration,and it enriches the flotation theory related sulfuration of copper oxide and provides a theoretical basis for development of new flotation process of copper oxide ore.The test result of chrysocolla enhanced sulfuration by amine（ammonium）salt presents that the recovery of chrysocolla is significantly improved by using single amine（ammonium）salt.The activation of combined ammonium-amine salt is stronger than that of single amine（ammonium）salt,and the reagent consumption is reduced.Compared with sulfidation-xanthate flotation in absence of amine（ammonium）salt,the recovery of chrysocolla is increased of 10-65%by using combined ammonium-amine salt.The result of zeta potential and adsorption capacity test shows that the combined ammonium-amine salt can not only increase xanthate adsorption capacity on the mineral surface,but also enhance the stability and adsorption rate of xanthate.This result indicates that the combined ammonium-amine salt has adsorption sensitization effect of xanthate adsorption;SEM-EDS analysis results show that the concentration of S atom concentration on the surface of chrysocolla by combined ammonium-amine salt is 5.42%,while is only 0.79%without amine（ammonium）salt.In addition,the result of dissolution test and XPS analysis shows that the combination of ammonium-amine salt promotes the chrysocolla surface dissolution,and its coordination ion with copper ion is formed to improve the floatability of chrysocolla.As a result,it can be concluded that the combined ammonium-amine salt enhances the adsorption of sulfur ions on the surface of chrysocolla,and it has sulfuration sensitization effect of xanthate adsorption.As above research results,the flotation mechanism of chrysocolla enhanced sulfidation by combined ammonium-amine salt is preliminarily constructed.（1）The adsorption of sulfur ions on the chrysocolla surface is enhanced as the ammonium-amine salt exists;（2）The combined ammonium-amine salt increases the dissolution of the mineral surface,and its combined ion with dissolved copper promotes the flotation of the chrysocolla;（3）The adsorption amount and the adsorption stability of xanthate on the surface of the chrysocolla are enhanced when the combined ammonium-amine salt is added,and the hydrophobicity of the surface of the mineral is enhanced;（4）The activity of Cu²⁺on the surface of the mineral is enhanced by using combined ammonium-amine salt,and so a new mineral surface with more active points is provided for sulfidation of sodium sulfide,which improve the floatability of chrysocolla.The research results not only enrich the flotation theory of copper oxide sulfidation,but also provide a theoretical basis for the research and development of new flotation process for copper oxide ore.