Research On Flotation Technology Of Selective Magnetic Agglomeration Based On Mineral Interactive Effect

The steady development of iron and steel industry need enough high quality iron ore,however,the iron ore production in china is difficult to meet the demand of iron and steel industry currently.It's urgently needed to rely on technological progress to make the part untapped existing iron ore resource reserves into iron ore supply.Iron ore in china is abundant,but difficult to be processed.It is partly due to the interaction among minerals,which lead to a decrease in processing difference,when mineral disseminated extent is fine.Interactive effect among minerals in flotation system is the influence on flotation separation including mineral adsorption,activation and depression for other minerals in flotation system with complex ores.This paper utilizes the interactive effect between the magnetite and hematite and quartz,and experimental study of flotation technology of selective magnetic agglomeration of fine hematite particles had been carried out.Magnetic agglomeration flotation of quartz and hematite were researched,and artificial mixture of quartz and hematite flotation separation were researched,mechanisms of selective magnetic agglomeration among minerals were discussed on the base of flotation solution chemistry,and the magnetic field distribution of magnetite particles was analysed.The equipment used in the study includes scanning electron microscope and EDSspectrum,Zeta potential measurement and infrared spectroscopy.The influence of fine magnetite particles on the floatability of quartz and hematite particles was studied in conventional flotation system.The results showed that the recovery of quartz and hematite was reduced to some extent when different particle size magnetite was added.The magnetite with particle size of-5?m had most significant impact,followed by magnetite with particle size of-10?m and the impact of magnetite with particle size of-18?m was slight.The influence of different particle size magnetite on flotation of different particle size artificial mixture of quartz and hematite showed that the hematite recovery improved,the Fe grade of tailings was reduced,the Fe grade of concentrate and the recovery of quartz in tailings improved slightly.And the smaller particle size of magnetite was added,the more significant influence it had.The results of the research on mechanism of selective magnetic agglomeration of fine hematite showed that the micro-fine magnetite and hematite can agglomerate selectively,but not occured with quartz.On the one hand,it can avoid the fine hematite adhering to the surface of quartz particles,which may loss with the tailings,on the other hand,the inhibitor have a better inhibitory effect on the agglomerate hematite.Thereby the recovery of fine hematite is improved,and a magnetic agglomeration flotation separation model is put forward.Adding magnetite with particle size of-5?m can affect the quartz recovery by covering among minerals.Magnetic field gradient and magnetic effects of a magnetite particle on other particles significantly enhanced,when magnetite particle size of less than 5?m,leading to the agglomeration between magnetite and the weak magnetic hematite.This is the fundamental reason why the magnetite selective magnetic agglomerate with hematite.Interaction of calcium chloride and sodium oleate generate oil calcium on the surface of quartz particles,so that the quartz has a certain floatability,while starch adsorpt on the surface of hematite with the form of chemical adsorption,and have inhibitory effect on hematite.Hematite surface have a maximum negative potential at pH=10.5,in which case the maximum mutual repulsion between particles of hematite and its dispersion effect is best.Flotation technology of selective magnetic agglomeration based on mineral interactive effect,can improve the flotation recovery of fine hematite,and provide a new approach for the recovery of fine hematite.