Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1991-11-12
1993-11-09
Andrews, Melvyn J.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423 49, 423 54, 423 63, 423 87, 423 98, 423109, 423112, C22B 316
Patent
active
052600394
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for the two-phase extraction of metal ions from phases containing solid metal oxides by means of a hydroxamic acid dissolved in an organic solvent. The present invention also relates to an agent for the extraction of metal ions from phases containing solid metal oxides. Finally, the present invention relates to the use of hydroxamic acids as agents for the extraction of metal ions from phases containing solid metal oxides.
2. Statement of Related Art
Processes for the selective extraction of metal ions from aqueous solutions with the aid of a hydroxamic acid dissolved in an organic solvent are known from the prior art.
According to DE-PS 22 10 106, using a hydroxamic acid of the general formula (A) ##STR1## in which the radicals R represent alkyl radicals, and in which the total number of carebon atoms in the molecule is greater than 10, transition metals are extracted from the partly radioactive, aqueous solutions from uranium-processing plants.
According to U.S. Pat. No. 3,464,784, the vanadium is extracted from aqueous solutions containing tetravalent vanadium with the aid of organosoluble hydroxamic acids of the general formula (B) ##STR2## in which R can represent alkyl, cycloalkyl or aryl radicals with 7 to 44 carbon atoms, preferably so-called "neo-alkyl radicals", which contain a quaternary carbon atom next to the carbonyl group.
"J. Chem. Research" (S) 1982, 90 ff, in addition, describes the solvent-extraction of transition metals with so-called versatohydroxamic acids of the above general formula (B), in which the radicals R are branched alkyl radicals containing 10 to 15 carbon atoms. The solvent-extraction with trialkylacethydroxamic acid of various metal isotopes from aqueous solutions from plants processing radioactive residues is described in "Reprints of the ISEC '86", Sep. 11-16, 1986, Munich, p. 355-362.
The processes described above, however, are solvent-extractions or liquid-liquid extractions, i.e. extraction processes in which the metal ions to be extracted are already in solution.
The separation of impurities from precious-metal electrolyte solutions by means of a two-phase liquid-liquid extraction is also known. The impurities arsenic, antimony, bismuth and iron are, for example, separated from aqueous, mineral-acid copper-electrolyte solutions with hydroxamic acids used as extracting agents. In this prior art, separation is effected by a liquid-liquid extraction, in which the impurities to be removed, which are in a dissolved form in the strongly acidic solution, are extracted in the organic phase.
The German Patent Application P 37 25 611.4 published on Feb. 9, 1989, for example, relates to a process for the simultaneous separation of arsenic, antimony, bismuth and iron from precious-metal electrolyte solutions by means of solvent extraction and the subsequent recovery of the named impurities, which is characterized in that aqueous, mineral-acid precious-metal electrolyte solutions are added to a poorly water-soluble organic solvent which contains one or more hydroxamic acids, the two phases are mixed together intensively, the impurities arsenic, antimony and bismuth are precipitated from the organic phase by sulfide-precipitation, the sulfides are separated off and the iron remaining in the organic phase is then re-extracted with a water-soluble complexing agent for iron into an aqueous phase and recovered.
The German Patent Application P 38 36 731.9 published on May 3, 1990 relates, further, to a process for the separation of impurities selected from arsenic, antimony, bismuth and/or iron from precious-metal electrolyte solutions by means of solvent-extraction and subsequent recovery of the named impurities, in which an aqueous, mineral-acid precious-metal electrolyte solution is added to a poorly water-soluble organic solvent containing one or more hydroxamic acids, the two phases are mixed together intensively, arsenic, antimony and bismuth are precipitated from the organic phase
REFERENCES:
patent: 3936494 (1976-02-01), Lipowski
Chemical Abstracts vol. 99 No. 12, 94231v 1983.
Kehl Ralf
Schwab Werner
Andrews Melvyn J.
Hendel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Span Patrick J.
Szoke Ernest G.
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