The sulphide leach liquor obtained from ocean nodules contains number of impurities like iron, copper and zinc in addition to valuable metals like nickel and cobalt. Both precipitation and solvent extraction techniques are used for removing these impurities for further processing for making pure nickel and cobalt. Extensive studies have been carried out in our laboratory to develop a solvent extraction route using 50% saponified 0.5 M di-(2-ethyl hexyl) phosphoric acid and 5% isodecanol in kerosene for the purpose. This paper highlights the influence of two important parameters viz. aqueous to organic ratio A/O and equilibrium pH on separation factor, beta of combined nickel and cobalt with respect to impurities. The separation factor in turn influences the recovery and purity of combined nickel and cobalt which remain in the raffinate.
Studies on removal of impurities from ocean nodules leach liquor by solvent extraction
1999
5 Seiten, 4 Quellen
Aufsatz (Konferenz)
Englisch
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