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:
Oct. 16, 1984
Filed:
Nov. 08, 1983
Mohammed Esna-Ashari, Bergisch Gladbach, DE;
Hermann Hilbrans, Langenfeld, DE;
Klockner-Humboldt-Deutz AG, , DE;
Abstract
A method for processing a sulfidic zinc source to recover metallic zinc wherein the source is leached with an electrolysis cell acid, the leaching product is separated into a liquor and a primary leaching residue, followed by drying and smelting of the dried leaching residue. The improvements of the present invention are directed primarily to the treatment of the liquor recovered from the leaching stage, and involve crystallizing out Fe.sup.2+ from the liquor as a ferrous sulfate hydrate in a crystallization stage, separating the filtrate from the crystallization stage in a first separation stage to produce a filtrate and a residue, neutralizing and oxidizing the separated filtrate from the crystallization stage to precipitate the remaining Fe.sup.2+ in a precipitation stage, separating the filtrate from the precipitation stage in a second separation stage and purifying the separated filtrate from the second separation stage before passing it to the electrolysis cell.