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Title: Solvent extraction of some metal ions using a biguanide complexant
Author: Holder, John Victor
ISNI:       0000 0004 2728 6870
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 1972
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A review is presented of recent work in the field of solvent extraction of metal ions by chelating compounds with particular reference to the metals iron, copper, cobalt and nickel. The preparation, and purification via its copper complex, of a substituted biguanide is described together with details of its preparation for use as a cation-exchange extractant. The extraction of copper, nickel and cobalt with this complexant is described and its inability to extract either iron(II) or iron (III) confirmed. From the results of various extraction and distribution experiments, and using published theory, the structure of the extracted biguanide-copper complex is shown to be of the type MA2(HA)6; similarly the average structure of the extractant in the organic phase is determined as the tetramer (HA)4. The effects of sulphate ions and ammonium ions on the extraction of all three metals were determined and the results are discussed. Ammonia was found not to hinder appreciably the extraction of the three metals tested but the presence of sulphate ions is found so to enhance the extraction of nickel, whilst slightly hindering cobalt extraction, that appreciable separation of these metals is possible by the preferential extraction of nickel. The separation of copper from iron is a desirable characteristic shown by this complexant and the possibilities for its use as an industrial extractant are discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available