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Anaerobic extraction of cobalt in a pulse column.

Authors
Penner-LR; Siemens-RE; Galvan-GJ
Source
Solvent Extr and Ion Exch 1986 Apr; 4(2):345-360
NIOSHTIC No.
10005068
Abstract
The effects of excluding air (oxygen) from a cobalt solvent extraction circuit were studied for lix 64n extractant. After solvent extraction of divalent cobalt from ammoniacal solutions with chelating extractants such as lix 64n, the loaded co-chelate is believed to oxidize to a stable trivalent complex that resists subsequent stripping with mineral acids. To improve stripping efficiency, cobalt was extracted and stripped in the absence of oxygen in pulsed, perforated-plate columns that were designed and constructed by the Bureau of Mines. When the ammoniacal cobalt(II) sulfate and lix 64n solutions were purged, blanketed, and pulsed with argon, cobalt extraction exceeded 99%, and stripping with 1 vol % h2so4 reached 98.5%. The stripped extractant was recycled to the extraction column with no loss of extraction efficiency in six passes through the circuit.
CODEN
SEIEDB
Publication Date
19860401
Document Type
OP; Journal Article
Fiscal Year
1986
NTIS Accession No.
NTIS Price
Identifying No.
OP 44-86
Issue of Publication
2
ISSN
0736-6299
NIOSH Division
ALRC
Source Name
Solvent Extraction and Ion Exchange
State
OR
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