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:
Mar. 18, 1980
Filed:
Aug. 14, 1978
Applicant:
Inventors:
Verner B Sefton, Edmonton, CA;
Godefridus M Swinkels, Rossland, CA;
Charles R Kirby, Rossland, CA;
Roman M Genik-Sas-Berezowsky, Edmonton, CA;
Assignees:
Cominco Ltd., Vancouver, CA;
Sherritt Gordon Mines Limited, Toronto, CA;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C01G / ;
U.S. Cl.
CPC ...
423141 ; 423145 ; 423146 ;
Abstract
A process for precipitation of iron as a jarosite compound from sulfate solution in which said solution fed sequentially through a plurality of reaction zones for oxidation and hydrolysis of ferrous sulfate in the presence of alkali-metal or ammonium ions for jarosite precipitation and simultaneous generation of sulfuric acid is subjected to a 'reverse temperature profile', i.e., higher temperature in the last reaction zone than in the first reaction zone, by injection of steam to the last reaction zone.