Improvement of calcium mineral separation contrast using anionic reagents: electrokinetics properties and flotation

5th International Conference New Achievements in Materials and Environmental Science

材料科学;生态环境科学

Lafhaj, Z.^1 ; Filippov, L.O.^1,2 ; Filippova, I.V.^1,2

Université de Lorraine, Laboratoire GeoRessources, UMR 7359 CNRS-Cregu ENSG, 2 rue du doyen Marcel Roubault, Vandœuvre-lès-Nancy

F-54501, France^1

National Universitie of Science and Technology MISiS, Leninsky pr., 4, Moscow

119049, Russia^2

关键词: Chemical compositions;    Flotation separation;    Iso-electric points;    Mineral-water interface;    Physicochemical characteristics;    Point of zero charge;    Selective separation;    Specific adsorption;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/879/1/012012/pdf
DOI  :  10.1088/1742-6596/879/1/012012

来源: IOP

【 摘 要 】

The flotation separation of salt type calcium minerals is problematic, due to the similarities in their same active Ca2+related site for interaction with anionic collectors and similar physicochemical characteristics such as solubility, zero-point charge, surface speciation and Ca-site density. The work was performed to achieve effective and selective separation of the calcium-minerals using pure minerals samples: orange calcite with Mg impurities, optic calcite with impurities level and an apatite. The pure samples surface was examined using techniques sensitive near-surface like infrared spectroscopy (FTIR) and chemical composition was obtained by ICPMS. The isoelectric point (IEP) and point of zero charge (PZC) in electrolyte were recorded using electrophoresis method at different ionic strengths of the solution. Mechanisms of charge development at the mineral-water interface are discussed. The time of contact as important parameter for the charge equilibrium was deduced from kinetics study and fixed to 30 minutes. The difference in the values obtained between IEP and PZSE can be explained by the presence of a specific adsorption of cations and anions on the surface. The effect of pure anionic collectors such as oleic and linoleic acid were studied. At low pH, both collectors lead to a good recovery for the calcites. The flotation recovery of optic calcite at pH 9 with sodium oleate is higher than with sodium linoleate. At alkaline pH, apatite showed a better recovery with sodium linoleate.