Abstract
Micro-flotation, zeta potential, fluorescence emission, interface topography and XPS tests were carried out to investigate the flotation and adsorption of sodium oleate (NaOl) on powellite. Micro-flotation results show that the flotation recovery varies with different Ca2+ concentrations in pulps. The greater negative charge on the washed powellite (W-M) surface with both Ca2+ and Ol− compared to that with only Ol− could be explained by the additional adsorption of Ol− on the surface, along with calcium dioleate precipitation through hydrophobic interactions between hydrocarbon chains in the Ol− ion and Ca(Ol)2, as indicated by the results from zeta potential measurements. The most nonpolar powellite surface were obtained from raw powellite (R-M) with Ol− and washed powellite with both Ca2+ and Ol−, which is in good accordance with flotation and zeta potential test results. When the powellite crystal was equilibrated with a mixed solution of calcium chloride and sodium oleate, the surface roughness average increased greatly from 4.503 nm to 16.327 nm, revealing the formation of non-uniform clusters of Ca(Ol)2 precipitates. XPS analysis further demonstrates the release of Ca ions into powellite pulp and the removal of them by ultrasonic treatment. The adsorption of Ca(Ol)2 and oleate anions are responsible for the flotation of powellite using NaOl, and the former is more predominant. A suggested comparative model are given through molecular dynamics simulation analysis.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.