SELECTIVE DISSOLUTION OF COPPER OXALATE USING SUPPORTED LIQUID MEMBRANES
作者:
Damir Kralj,
GerdiR.M. Breembroek,
GeertJan Witkamp,
GerdaM. van Rosmalen,
Ljerka Brečević,
期刊:
Solvent Extraction and Ion Exchange
(Taylor Available online 1996)
卷期:
Volume 14,
issue 4
页码: 705-720
ISSN:0736-6299
年代: 1996
DOI:10.1080/07366299608918364
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A supported liquid membrane has been used to dissolve selectively copper oxalate from a suspension of copper, calcium and cadmium oxalate, which have low, similar solubilities. 2-Hydroxy-5-nonyl-acetophenone oxime (HX) dissolved in kerosene was used as a carrier for copper transport from the suspension to the stripping solution. A mathematical model of the copper permeation is presented. The model takes into account the dissolution kinetics of CuC204-1/2H20, the diffusion of copper ions through an aqueous stagnant layer, the chemical reaction at the aqueous/membrane interface, and the diffusion of the CuX2complex in the membrane. The model fits the experimental data well with a unique parameter set, except for the transport from an acetate buffered system, for which a lower rate constant for the reaction at the membrane interface had to be assumed. In a separate set of experiments the dissolution of copper oxalate hemihydrate in water was found to be surface reaction controlled.
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