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. 10, 1996
Filed:
Jul. 18, 1995
Tadashi Nishino, Tokyo, JP;
Yukiyoshi Iwamoto, Tokyo, JP;
Abstract
The present invention provides a method for dissolving slightly soluble sludge which is produced during chemical conversion coating of metal, which comprises agitating the sludge in an aqueous suspension containing hydrogen type strongly acidic cation exchange resin; exchanging metallic components in the sludge with the resin and adsorbing the metallic components on the resin; dissolving oxyacid components in the sludge into liquid phase; and recovering the metallic components from the resin and the oxyacid components from the resin and the oxyacid components from the solution. The sludge can be dissolved by simple operation and equipment, and effective components in the sludge can be recovered at high yield. The method contributes to effective re-utilization of resources and to prevention of environmental pollution and makes it possible to use the resin semipermanently by regenerating the used ion exchange resin.