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:
May. 24, 1983
Filed:
Sep. 29, 1981
Applicant:
Inventors:
Jussi K Rastas, Pori, FI;
Kaarlo M Saari, Vanha-Ulvila, FI;
Vaino V Hintikka, Vanha-Ulvila, FI;
Jaakko O Leppinen, Vammala, FI;
Aimo E Jarvinen, Kokkola, FI;
Assignee:
Outokumpu Oy, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B03D / ;
U.S. Cl.
CPC ...
423 26 ; 423 48 ; 423 89 ; 423109 ; 209166 ; 209167 ;
Abstract
A process is disclosed for the recovery of lead, silver and gold from the iron-bearing residue of an electrolytic zinc process by froth-flotating a slurry of the iron-bearing residue in the presence of a sulfidic collector agent in order to froth-flotate the sulfides and to separate them from the iron-bearing residue. The iron-bearing residue is sulfidized selectively in order to convert the lead, silver and possibly gold substantially quantitatively to sulfides before the iron-bearing residue is froth-flotated.