马鞍山铁尾矿中铁硫钒元素地球化学特征及其资源赋存潜力评估OA

China's iron tailings discharge is huge,accounting for 45%of the total tailings.Its comprehensive utiliza-tion has important practical significance for alleviating the shortage of resources and reducing environmental pressure.In this paper,the iron tailings of a mining area in Ma'anshan,Anhui Province were taken as the research object,and representative sampling was carried out in the'coarse magnetic separation+sand fishing'process section.Combined with X-ray fluorescence spectroscopy(XRF),X-ray diffraction(XRD)and transmission electron microscopy(TEM)techniques,the existence state and distribution law of the target elements were explored,and their resource occurrence potential was evaluated.The results show that the chemical compositions of iron tailings are mainly SiO2,Al2O3,Fe2O3,MgO,CaO,SO3 and Na2O,and the main mineral components are quartz,pyrite,hematite,albite and clino-chlore.Pyrite is the main occurrence mineral of sulfur,and its lattice structure is complete.The amount of sulfur resources in iron tailings is higher than the threshold of industrialization and has recycling value.The vanadium resource is only 800 t/a,which does not have recycling value.Based on the occurrence characteristics of sulfur in iron tailings,a synergistic recovery process of'gravity pre-enrichment of sulfur concentrate-flotation enhanced sulfur recovery-magnetic separation for iron extraction'was innovatively proposed.The sulfur concentrate 1 with sulfur grade of 39.77%and yield of 3.06%can be obtained by shaking table gravity separation(350 times/min).The sulfur concentrate 2 with sulfur grade of 49.23%and yield of 12.63%can be obtained by flotation(800 g/t butyl xanthate+30 g/t 2#oil).The gravity sulfur concentrate can recover 5.47%of magnetic iron by 2 000 Gs magnetic separation,and the sulfur grade is increased to 41.78%.The grade of TFe is 58.1%and the recovery rate of iron is 32.3%after pre-magnetic separation of weak magnetic iron by 1.0 T magnetic field.The total mass fraction of SiO2,Al2O3,CaO and MgO in the remaining tailings is more than 70%,which can be used in the field of building materials.