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:
Sep. 23, 1997
Filed:
Jun. 06, 1995
Applicant:
Inventors:
Michael J Virnig, Tucson, AZ (US);
J Murdoch MacKenzie, Gisborne, AU;
Assignee:
Henkel Corporation, Plymouth Meeting, PA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C25C / ; C22B / ; C22B / ;
U.S. Cl.
CPC ...
205345 ; 205580 ; 205581 ; 423 24 ;
Abstract
An improved process is described for the recovery of copper from an aqueous feed solution using solvent extraction and electrowinning in which the electrowinning is conducted in a first step wherein the electrolyte is flowing perpendicular to the cathode surface without auxiliary mixing of the electrolyte between electrodes, and a second step wherein the electrolyte is flowing parallel to the cathode surface. In a second embodiment, solvent extraction of copper and solvent extraction of acid are conducted in alternate steps to allow more complete recovery of copper.