The Synthesis Of Nanoparticle Collector With Emulsion Polymerization And Its Characterization

Microfine mineral particle`s small size,the mass and momentuml,and high interfacial free energy,results in its high oxidation rate,big solubility,the weak selectivity of adsorption on agent,low flotation rate,serious mud coverage and inclusion,making microfine mineral be one of the difficult problems in the field of mineral processing.In recent years,some scholars in abroad have begun to carry out research on nano particles as the flotation collector.Therefore,the application of nanoparticles as microfine mineral flotation collector has theory and realistic basis.This paper examined the effect of different conditions on the monomer conversation rate and particle size in the process of emulsion polymerization of new hydrophobic nanoparticles collector in order to find the best synthesis conditions.Then the nanoparticles collector was studied by infrared spectrum,laser granularity,scanning electron microscope(SEM),Zeta potential and contact angle to analyze nanoparticles collector on the surface morphology and composition characteristics.Then the nanoparticles synthesized under the optimum conditions were used as collector collectors on microfine chalcopyrite,quartz and pyrite respectively,in flotation dosage and p H value conditions test,to obtain the best nanoparticles collector condition.Finally,the action mechanism of nano particles collector and three kinds of minerals were analyzed by the infrared spectrum,Zeta potential,contact angle and scanning electron microscope that nanoparticle collector adsorbed on minerals.Under the condition of synthesis that styrene monomer of 5.0 g,SDS of 0.08 g,initiator APS of 0.025 g,functional material MBT of 0.125 g,stirring speed of 400 r/min,temperature of 70 ?,the nanoparticles collector HNP had the best monomer conversion rate and particle size optimal,of86.20% and 77 nm,respectively.SEM results showed that the particle size,uniformity and dispersion of HNP are all good.Infrared spectrum of the HNP revealed that,the C = C double bond in St and the C = N double bond in BMT were cracked to polymerize.Contact angle test of HNP found that its contact angle is 105.29,which showed strong hydrophobicity.Pure mineral flotation test results at natural p H value,nanoparticles emulsion dosage of 1.0 ml,no foaming agent conditions,were these chalcopyrite recovery rate reached as high as 96.32%,pyrite recovery rate was 64.86%,and maximum recovery rate of quartz reached only 23.20%,which shown well separation of mocrofine chalcopyrite,with pyrite and quartz.Infrared spectrum diagram and Zetapotential diagram showed that,chemical adsorption existed between HNP and chalcopyrite and pyrite,while only hydrogen bond existed between HNP and quartz.Contact angle test illustrated that,the chalcopyrite contact angle have greatly improved after adsorbed by HNP,the contact angle of pyrite also has good promotion,while the promotion of quartz contact angle is quite small.SEM explained that,the recovery of minerals and HNP adsorption on its surface has direct relationship,and the order of HNP on three kinds of mineral surface adsorption capacity was:chalcopyrite > pyrite > quartz,which was consistent with the recovery rate results.