Patent · US Expired

Process for selective extraction of contaminant elements from mixtures of electrolytes in solution

US5039496A · kind A · utility

9Cited by

8References

21Claims

0Family size

Assignee

Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

Ralf Kehl · Goldkronach, DE
Werner Schwab · Monheim, DE
Robert B. Sudderth · Tucson, US
Gary A. Korkosky · Tucson, US

Key dates

Filing date	Oct 27, 1989
Grant date	Aug 13, 1991
Priority date	—
Expiry date	Oct 27, 2009

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P10/20
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Prior art processes for removal of one or more contaminant elements, including at least one of antimony, bismuth, and arsenic and optionally including iron, from electrolyte solutions of primary metals by solvent extraction with an organic phase including a hydroxamic acid, then precipitating at least part of the contaminant elements from the organic phase as sulfides, are improved by an additional step of re-extracting the organic phase with water before precipitating the sulfides from it. At least part of any arsenic present and, if desired, part of any antimony as well, may be re-extracted in this manner and subsequently recovered if desired, so that the overall process is made more economical.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.