Ion exchange process for the purification of base metal electrolyte solutions
AssigneeAshland Oil, Inc.
InventorsAlvin D. Cronberg, James A. Hartlage, Joe W. Cotton
Life of this patent
Estimating the term…
Abstract
A co-reagent system in the form of an admixture of a metal chelation collector and a mono- or dialkyl substituted phosphoric acid is adapted for selectively removing ferric iron from base metal electrolytic solutions in accordance with the liquid-liquid ion exchange extraction technique.
Claims7
A liquid-liquid ion exchange process for selectively removing ferric iron contaminants from an electrolyte solution of copper, cobalt, nickel or zinc sulfate which comprises first adjusting the acid content of said solution to provide from about 100 to 200 grams of H.sub.2 SO.sub.4 per liter thereof and thereupon intimately contacting the acidified solution with a phase stabilized water-immiscible organic solvent solution of an extractant co-reagent consisting essentially of a mono- or dialkyl phosphoric acid and a metal chelation collector selected from the group consisting of an 8-hydroxyquinoline substituted in the No. 7 position with a long chain aliphatic hydrocarbon radical and an oil-soluble 2-hydroxy benzophenoneoxime wherein said metal chelation collector and said phosphoric acid are present in a molar ratio of from 1:1::1:4, respectively, and separating the organic phase from the aqueous phase to provide an aqueous phase containing a substantially reduced content of the ferric iron contaminants.
Dependencies are inferred from the claim text.