The effect of sodium hexametaphosphate（SHMP） on the separation of serpentine from pyrite and its mechanism were studied systematically through flotation tests,sedimentation tests,surface dissolution,ζ potential tes...The effect of sodium hexametaphosphate（SHMP） on the separation of serpentine from pyrite and its mechanism were studied systematically through flotation tests,sedimentation tests,surface dissolution,ζ potential tests,adsorption measurements,and infrared spectroscopic analyses.The results show that the SHMP could significantly reduce the adverse effect of serpentine on the flotation of pyrite and make the mixed sample of pyrite and serpentine more disperse in the alkaline condition,thus improve the adsorption of xanthate on pyrite.The action mechanism of the SHMP is that it lowers the pH value at the isoelectric point of serpentine and enhances the negative charge through the dissolution of magnesium from the surface of serpentine and adsorbing on the surface of serpentine.It changes the total interaction energy between serpentine and pyrite from gravitational potential energy to repulse potential energy,according to the calculation of the EDLVO theory.展开更多
Nanocomposites exhibiting high electric conductivity and high saturation magnetization were synthesized in bulk using a solvent-thermal route, which combined the hybridization growth of Fe3O4 nanoparticles, graphene o...Nanocomposites exhibiting high electric conductivity and high saturation magnetization were synthesized in bulk using a solvent-thermal route, which combined the hybridization growth of Fe3O4 nanoparticles, graphene oxide, and a conductive oligomer in one step. The hybrid spheres with diameters of 100–300 nm(mostly approximately 200 nm) consisted of a homogenous phase without obvious interfaces between the ternary components. The electric conductivity of the hybrid material was greatly improved after heat treatment at high temperature. Because of the interfacial polarization and good separation property due to its magnetism properties, the interpenetrating nature of the materials yielded good synergistic effects on the electromagnetic wave absorbing properties. The multi-frequency reflection band covering the C band and Ku band with a maximum reflection loss of-45 d B for a thickness of 5 mm is promising for lightweight and strong electromagnetic attenuation applications.展开更多
基金Project(2007CB613602)supported by the National Basic Research Program of China
文摘The effect of sodium hexametaphosphate（SHMP） on the separation of serpentine from pyrite and its mechanism were studied systematically through flotation tests,sedimentation tests,surface dissolution,ζ potential tests,adsorption measurements,and infrared spectroscopic analyses.The results show that the SHMP could significantly reduce the adverse effect of serpentine on the flotation of pyrite and make the mixed sample of pyrite and serpentine more disperse in the alkaline condition,thus improve the adsorption of xanthate on pyrite.The action mechanism of the SHMP is that it lowers the pH value at the isoelectric point of serpentine and enhances the negative charge through the dissolution of magnesium from the surface of serpentine and adsorbing on the surface of serpentine.It changes the total interaction energy between serpentine and pyrite from gravitational potential energy to repulse potential energy,according to the calculation of the EDLVO theory.
基金supported by the Fundamental Research Funds for the Central Universities, UESTC (ZYGX2013J034)
文摘Nanocomposites exhibiting high electric conductivity and high saturation magnetization were synthesized in bulk using a solvent-thermal route, which combined the hybridization growth of Fe3O4 nanoparticles, graphene oxide, and a conductive oligomer in one step. The hybrid spheres with diameters of 100–300 nm(mostly approximately 200 nm) consisted of a homogenous phase without obvious interfaces between the ternary components. The electric conductivity of the hybrid material was greatly improved after heat treatment at high temperature. Because of the interfacial polarization and good separation property due to its magnetism properties, the interpenetrating nature of the materials yielded good synergistic effects on the electromagnetic wave absorbing properties. The multi-frequency reflection band covering the C band and Ku band with a maximum reflection loss of-45 d B for a thickness of 5 mm is promising for lightweight and strong electromagnetic attenuation applications.
