Thesis /

ROMDOC-THESIS-2010-006

Contribuţii la separarea prin flotaţie a speciilor LaIII şi YIII din sisteme apoase şi valori

Popescu, Vasile
2007-01-01

Abstract: The original contributions of this work refers to the separation and concentration by flotation of YIII and LaIII ions from aqueous solutions in mono- MIII-STA, di- MIII-CuII-STA and tri-component MIII-BaII-CuII-STA systems; the ion separation is simultaneously and quantitative, with applications in environmental protection and separatology science. The obtained sublate, containing the complex insoluble species, was transformed in oxidic compounds. The process schemes, which can be also applied on other systems, were proposed. For a correct evaluation of the research results in the tricomponent system MIII-BaII-CuII-STA, an alternative way was the forced hydrolysis; with this method, polynuclear complex combinations mixed-oxides precursors are obtained. The study of interaction and the formulation of the separated complex combinations in mono-, di- and tri-component systems are based on the results of elemental analysis, UV-VIS, FT-IR and reflexion electronic spectroscopy, ICP and thermal analysis. The characterization of the oxide powders obtained by thermal treatments was done by undistructive physico-chemical techniques: X-ray diffraction, scanning electronic microscopy (SEM) and electrical conductivity in the range 75-300 K.

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