| Zinc is an important industrial raw material.It is the third largest non-ferrous metal after copper and aluminum in the consumption of non-ferrous metals.At present,zinc metal is mainly supplied by zinc sulfide minerals in the world.However,with the depletion of high-grade zinc sulfide resources,it is of great significance to develop and utilize zinc oxide ore.Sulfidization xanthate flotation is a promising method for enriching zinc oxide minerals,and hemimorphite is an important zinc oxide mineral.However,the active zinc sites on the surface of hemimorphite are often obscured by silicate,resulting in low surface reactivity.Therefore,there are some problems in the process of sulfidization flotation,such as low sulfidization efficiency,unstable sulfidization layer and poor xanthate adsorption.In order to solve the above problems,this paper proposes a new idea of synergistic activation flotation of copper-lead components in hemimorphite.In this paper,the effect of synergistic activation of copper-lead components in sulfidization xanthate system on the flotation recovery of hemimorphite was investigated by micro-flotation test.The adsorption mechanism of copper-lead components on the mineral surface before and after the sulfidization of hemimorphite was studied by means of surface analysis and solution detection.The enhanced sulfidization mechanism of copper-lead components on the surface of hemimorphite was revealed,and the adsorption mechanism and hydrophobicity evolution of xanthate on the mineral surface were systematically studied.The results of micro-flotation test show that the flotation index is very poor when the conventional sulfidization xanthate flotation method is used to recover the hemimorphite.When a single copper ion or lead ion is used to pretreat the surface of the hemimorphite,the flotation recovery rate is improved,and the effect of lead ion is better than that of copper ion.After the synergistic activation of copper-lead components before the sulfidization of hemimorphite,the flotation recovery rate is greatly improved,and the flotation index is much higher than that obtained after the pretreatment of copper ions or lead ions.Compared with the copper ion or lead ion activation system,the flotation recovery of hemimorphite in the copper-lead component synergistic activation system increased by about 80% and 60% respectively.After copper ions or lead ions interact with the surface of hemimorphite,copper or lead components can be adsorbed on the mineral surface and form a certain thickness of copper or lead-containing adsorption layer.After the synergistic activation of copper-lead components,the activated layer formed on the surface of the mineral is composed of copper and lead components,and the content of active products is higher than that of single copper ion or lead ion treatment.After the sulfidization treatment of hemimorphite in the synergistic activation system of copper-lead components,a multi-component sulfidization product composed of zinc sulfide,copper sulfide and lead sulfide were formed on the mineral surface,and the reactivity of copper sulfide and lead sulfide components was stronger than that of zinc sulfide components.This not only increases the content of sulfidization products on the surface of hemimorphite,but also enhances the reactivity,which is conducive to the subsequent adsorption of xanthate on the surface of hemimorphite,greatly improves the hydrophobicity of the mineral surface,and creates good conditions for the flotation of hemimorphite.Compared with the synergistic activation of copper-lead components before the sulfidization of hemimorphite,the flotation recovery of hemimorphite after sulfidization synergistic activation with copper-lead components is also greatly improved.Compared with single copper ion or lead ion activation system after sulfidization,the flotation recovery of sulfidized hemimorphite increased by about 50 %and 20 % respectively after synergistic activation of copper-lead components.After the sulfidized hemimorphite is activated by copper ion or lead ion,the sulfidization products generated on the surface of the mineral was copper sulfide or lead sulfide components in addition to zinc sulfide.After the synergistic activation of copper-lead components on the surface of the hemimorphite,a sulfidization product consisting of zinc sulfide,copper sulfide and lead sulfide components is formed on the surface of the mineral,and the content of the sulfidization product is higher than that of single copper ion or lead ion activation system.Because the reactivity of copper sulfide and lead sulfide components with xanthate is stronger than that of zinc sulfide components,after the synergistic activation of copper-lead components on the surface of sulfidized hemimorphite,the interaction between xanthate and mineral surface is stronger,the adsorption amount of collectors on the mineral surface is larger,and the surface hydrophobicity is enhanced,which is beneficial to the hydrophobic flotation of sulfidized hemimorphite.In the process of sulfidization flotation of hemimorphite,the floatability is greatly improved by adding copper-lead components before or after sulfidization,which is beneficial to the efficient recovery of refractory zinc silicate.However,there are some differences in the activation mechanism of copper-lead components before and after sulfidization of hemimorphite.The addition of copper-lead components before sulfidization of hemimorphite mainly improves the reactivity of hemimorphite surface,which is conducive to the adsorption of more sulfur ions on the surface of minerals,so as to achieve enhanced sulfidization;the addition of copper-lead component after sulfidization of hemimorphite is mainly about the interaction between copper-lead component and the sulfur site on the surface of sulfidized hemimorphite,which enhances the reactivity of the sulfidized hemimorphite and facilitates the adsorption of xanthate on the mineral surface,thereby enhancing the hydrophobicity of the mineral surface.Therefore,in the flotation practice of hemimorphite zinc oxide ore,copper-lead components can be used to synergistically activate zinc silicate minerals in the ore,thereby improving the flotation index of zinc. |
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