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. 26, 2009
Filed:
Oct. 01, 2004
Applicants:
Gerhard Auer, Krefeld, DE;
Berndt-ullrich Köhler, Krefeld, DE;
Benno Laubach, Krefeld, DE;
Inventors:
Assignee:
Tronox Pigments GmbH, Krefeld, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C01B 7/01 (2006.01); C01B 17/90 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention concerns a method for processing heavy metal-laden spent sulfuric acid. For this, iron-laden spent sulfuric acid or iron-laden sulfuric materials obtained therefrom are reacted with a material that contains iron chloride and optionally other metal chlorides, producing iron (II) sulfate. The spent sulfuric acid preferably derives from titanium dioxide production.