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. 23, 2010
Filed:
Oct. 22, 2004
Applicants:
Leena Lehtinen, Pori, FI;
Marko Lahtinen, Pori, FI;
Marika Jyrälä, Pori, FI;
Matti Vuokko, Pori, FI;
Inventors:
Leena Lehtinen, Pori, FI;
Marko Lahtinen, Pori, FI;
Marika Jyrälä, Pori, FI;
Matti Vuokko, Pori, FI;
Assignee:
Outotec Oyj, Espoo, FI;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D 15/08 (2006.01); C25C 1/16 (2006.01);
U.S. Cl.
CPC ...
Abstract
The purpose of the invention is to remove copper selectively from a concentrated zinc sulphate solution by ion exchange. The method enables a significant reduction in the use of zinc powder during the solution purification of zinc sulphate solution and makes possible to avoid usage of arsenic or antimony trioxides as a precipitation chemical. The method is to be combined with the chloride removal that occurs as a sub-stage of solution purification.