Shannon Mccullough Anderson

US Patent:

55163645, May 14, 1996

Filed:

Jan 20, 1995

Appl. No.:

8/375795

Inventors:

James G. Brantley - Warthen GA
Charles D. Anderson - Warthen GA
Shannon S. Anderson - Davisboro GA
Andrew L. Wilcher - Mitchell GA
R. Brock McNeely - Davisboro GA

Assignee:

ECC International Inc. - Atlanta GA

International Classification:

C04B 1410
C04B 3304

US Classification:

106484

Abstract:

An improvement is disclosed in the method for producing a calcined kaolin clay powder for use in paper manufacture, by the steps of wet beneficiating a kaolin crude, drying the beneficiated crude, milling the dried beneficiated crude to provide a calciner feed, and calcining the feed to destroy the crystallinity thereof and provide an amorphous calcined kaolin powder. According to the improvement, the dried beneficiated crude is milled and classified to provide a calciner feed having substantially no +325 mesh residue, and not greater than 0. 0003% by weight +635 mesh residue. This enables lowered abrasion in the calcined powder, and lowered viscocity in the slurried calcined powder product to thereby enable a higher solids slurry.