Adsorption of oleate and octyl-hydroxamate on to rare-earths minerals

Pavez O.; Brandao P.R.G.; Peres A.E.C.

Keywords: kinetics, adsorption, flotation, potassium, agents, sodium, earths, rare, compounds, Reaction, Monazite, octylhydroxamate, oleate


The adsorption of sodium oleate and potassium octyl-hydroxamate onto the rare-earths minerals monazite and bastnaesite was investigated through microflotation experiments, zeta potential determinations and infrared spectroscopy. The monazite and bastnaesite samples were purified in the laboratory reaching, respectively, final grades of 68.7 and 45.3% RE2O3 + ThO2. The results confirm that sodium oleate chemisorbs onto bastnaesite and suggest a physical adsorption mechanism of this reagent onto monazite. Despite the lack of a full confirmation from FTIR spectrometry, there is a possibility of oleate chemisorption onto monazite in the pH range above the isoelectric point. A chemical adsorption mechanism was established for the interaction between octylhydroxamate and both minerals.

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Título de la Revista: MINERALS ENGINEERING
Volumen: 9
Número: 3
Fecha de publicación: 1996
Página de inicio: 357
Página final: 366