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:
Apr. 11, 2000
Filed:
Aug. 22, 1997
Applicant:
Inventors:
Jorge Miller, Bogota, CO;
Brian Richard Davis, Houston, TX (US);
Joseph Aloysius Rahm, Licking, MO (US);
Eric James Madsen, Houston, TX (US);
Assignee:
Kemicraft Overseas Limited, Douglas, GB;
Primary Examiner:
Int. Cl.
CPC ...
C01G / ; C09C / ;
U.S. Cl.
CPC ...
423 82 ; 423610 ; 422150 ;
Abstract
A non-polluting liquid-phase process and a supporting system of apparatus for producing titanium dioxide from titanium ore or slag provide a more economical sulfate process for preparing anatase. The ore or slag is reacted with hot sulfuric acid. The reaction product is filtered and washed before being combined with acid water, in which the solids are partially dissolved. The resulting suspension is filtered, and the filtrate hydrolyzed to convert titanium values therein to titanium dioxide hydrate, which is calcined to produce anatase pigment.