Separation Technology And Mechanism Of Iron Zinc And Sulfur In An Iron Ore In Xinjiang

With iron and zinc in the original process of an iron ore in Xinjiang,the Zn-S grade of the iron concentrate was too high,which made the subsequent smelting quality of the iron concentrate not up to standard;the Zn recovery rate in the zinc concentrate was too low so that part of the Zn in the original ore accompanied by tailings entering the tailings dam,which caused the waste of Zn resources and economic losses of the enterprise.Therefore,based on improving the quality of iron ore concentrate,taking into account the selection plan of comprehensive Zn recovery was of great significance for improving resource recycling and enterprise benefits.According to the actual ore and single mineral of the iron ore in Xinjiang,this article carried out the study on the separation process of Fe,Zn,S,and the separation mechanism of Zn and S,with good experience results.The research results showed that:（1）The iron grade in the raw ore was 35.65%,and the iron minerals were mainly magnetite,followed by pyrrhotite and pyrite.In addition,the grades of zinc and sulfur were 1.12%and 1.56%,respectively,with zinc and sulfur mainly in the form of sphalerite,pyrite,and pyrrhotite.The inter-minerals were closely connected with each other and had a finer grain size.Gangue minerals were mainly pyroxene,calcite,chlorite,and amphibole.（2）The raw ore treated by combined technology of magnetic separation flotation process,Flotation magnetic separation process 1,Flotation magnetic separation process2,analyzed of ore beneficiation index,the raw ore was treated by flotation magnetic separation process 1 and flotation magnetic separation process 2,after which qualified zinc concentrate and iron concentrate were obtained,with its grade and recovery rate index similar.With analysis of process structure,the flotation magnetic separation process2 adopted low magnetic field pre-magnetic separation method,which could decrease the percent of mill processing capacity for 32.72%and 29.91%respectively compared with magnetic separation flotation process,flotation magnetic separation process 1 and effectively reduce the cost of ore processing.Comprehensive process structure and beneficiation indicators,the method of the flotation magnetic separation process 2 was the best.（3）Taking into account the comprehensive recovery of Zn and adopting the process of"one roughing,one pre-selection,one magnetic separation,and three selections",a zinc concentrate with a yield of 1.87%,Zn grade 48.33%,and recovery rate of 80.79%was obtained,which made Zn recycled effectively.（4）Artificially mixed ore flotation experience showed that in the flotation system of butyl xanthate and terpineol oil,sphalerite and pyrite had the best separation effects as Ca O was p H adjuster,p H value of the slurry was 12.00,56 mg/L Cu SO₄ was introduced to activate sphalerite,with the recovery rate of sphalerite in the concentrate 86.26%,and the recovery rate of pyrite as low as 14.22%.（5）The study on the mechanism of Zn S separation showed that by establishing the crystal model of sphalerite（110）and pyrite（100）surfaces,simulating the flotation slurry system,analyzing and calculating the difference between the adsorption energy of ions on the surface of the crystal structure,the relative molecular concentration,and the mean square displacement through the introduction of Ca（OH）₂ and Cu SO₄ in the slurry,Ca（OH）₂ and Cu²⁺had a competitive adsorption effect on sphalerite and pyrite.Ca（OH）₂preferentially adsorbed on the surface of pyrite,which deteriorated its flotation effect;Cu²⁺preferentially adsorbed on the surface of sphalerite,activating its surface and forming Cu S compounds,resulting in the difference of floatability between sphalerite and pyrite and make Zn S separation.