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:
Nov. 20, 1990
Filed:
Oct. 04, 1989
Applicant:
Inventors:
Weyman H Dunaway, Sandersville, GA (US);
Lev F Verbov, Milledgeville, GA (US);
Assignee:
ECC America Inc., Atlanta, GA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
106468 ; 106407 ; 423328 ; 501147 ;
Abstract
Aggregation of kaolin particles by wet processing using a hydrothermal technique is described. Calcined clay is first digested in a solution containing NaOH and the obtained sodium silicate solution is separated. Aggregation of uncalcined clay particles by hydrothermal treatment is then carried out using the obtained solution. The method enables aggregation of low grade clays unsuitable for calcination. A two-stage hydrothermal process is also described. Bleaching with oxygen or bleaching compounds may be effected during hydrothermal treatment.