| abstract |
PCT No. PCT/EP93/00322 Sec. 371 Date Oct. 19, 1994 Sec. 102(e) Date Oct. 19, 1994 PCT Filed Feb. 10, 1993 PCT Pub. No. WO93/17134 PCT Pub. Date Sep. 2, 1993A process is disclosed for removing impurity elements, such as arsenic, and if necessary antimony, iron or bismuth, from valuable metal containing, such as copper containing, strongly mineral acid solutions by way of solvent extraction with organic solutions of hydroxamic acids, and for selectively stripping the impurity elements therefrom. Antimony, iron or bismuth are stripped with complexing acids, and arsenic is stripped with an aqueous solution containing valuable metal ions at a pH value in the 1.5 to 5 range, a higher pH than the original valuable metal containing aqueous acid solution. |