Poisoning of liquid membrane carriers in extraction of metal ions

Journal Article · Sun Mar 01 00:00:00 EST 1992 · Separation Science and Technology; (United States)

DOI:https://doi.org/10.1080/01496399208018884· OSTI ID:5158305

Wang, Yuchun; Wang, Dexian ^[1]

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1. Jiangxi Normal Univ., Nanchang (China)

As means of effective separation and preconcentration, emulsion liquid membranes (ELMs) have found application in many fields including biochemical separation, wastewater treatment, hydrometallurgy, and preconcentration in analytical chemistry. In the extraction of desired metal (scandium, mixed rare earths) ions using chelating extractants (TTA, HDEHP) as liquid membrane carriers, the carriers will become poisoned owing to the presence of even minute quantity of certain high ionic potential ions in the feed solution. The reason for the poisoning of carriers is that those ions have so much greater affinity than the desired ions for the membrane carrier that the ion-carrier coordination compound cannot be stripped at the interior interface of the membrane and gradually no more free carrier transports any metal ions across the membrane. The calculated results are in agreement with the experiments, and methods to avoid the poisoning are given in the paper.

• OSTI ID: 5158305
• Journal Information: Separation Science and Technology; (United States), Vol. 27:3; ISSN 0149-6395
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
CARRIERS
POISONING
SCANDIUM
MEMBRANE TRANSPORT
SUPPORTED LIQUID MEMBRANES
ZIRCONIUM
CALCIUM
CHELATES
EMULSIONS
EXPERIMENTAL DATA
EXTRACTION
INTERFACES
IONS
IRON
MANGANESE
PROCESS CONTROL
TITANIUM
ALKALINE EARTH METALS
CHARGED PARTICLES
COLLOIDS
COMPLEXES
CONTROL
DATA
DISPERSIONS
ELEMENTS
INFORMATION
MEMBRANES
METALS
NUMERICAL DATA
SEPARATION PROCESSES
TRANSITION ELEMENTS
400105* - Separation Procedures
540320 - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)