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. 13, 1997
Filed:
Nov. 13, 1995
Applicant:
Inventors:
Assignee:
Outokumpu Engineering Contractors OY, Espoo, FI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C22B / ;
U.S. Cl.
CPC ...
75743 ; 423 27 ; 4231504 ;
Abstract
The invention relates to a process for leaching nickel and copper from nickel-copper matte formed in pyrometallurgical nickel production by means of a multi-stage process. It is essential of the invention that the leaching of nickel takes place in at least two stages in conditions where free sulfuric acid is essentially absent, and that in these stages, the leaching of the nickel content of the matte is mainly carried out with copper as the oxidizer.