The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 11, 1995
Filed:
Mar. 02, 1994
Volker Brucken, Eschborn, DE;
Gert Ungar, Frankfurt am Main, DE;
Hans-Martin Stonner, Eschborn, DE;
Ernst Stoldt, Heppenheim, DE;
Johann Schlauer, Frankfurt am Main, DE;
Nikola Anastasijevic, Schoneck, DE;
Eilhard Hillrichs, Budingen, DE;
Metallgesellschaft Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
An aqueous solution which contains ammonium polysulfide is proportionally added to the sour water, which contains cyanide ions, ammonium ions, and sulfide ions. At least part of the cyanide ions contained in the sour water is converted to thiocyanate ions by the ammonium polysulfide. The solution which contains ammonium polysulfide is prepared from an aqueous solution by oxidation in an electrochemical cell. That aqueous solution may consist entirely or in part of sour water.