Anthony A May

US Patent:

6615987, Sep 9, 2003

Filed:

May 5, 2000

Appl. No.:

09/566130

Inventors:

David Andrew Greenhill - St. Austell, GB
Anthony Allan May - Sandersville GA
Christopher R. L. Golley - Sandersville GA
Ronald Windell Andrews - Sandersville GA

Assignee:

Imerys Pigments, Inc. - Roswell GA

International Classification:

B03B 100

US Classification:

209 5, 209 11, 106486

Abstract:

A method of treating a kaolin particulate material to improve its properties by removal of impurities which includes the steps of: (a) producing a dispersed aqueous suspension of a kaolin particulate material containing at least 0. 1% by weight, based on the dry weight of the kaolin particulate material, of separable impurity by adding a dispersing agent to the kaolin particulate material to deflocculate solid particles of the material in the suspension; (b) conditioning the suspension prior to adding selective flocculation polymer thereto by allowing the suspension to age for a period of at least 30 minutes and optionally by adding one or more conditioning chemicals thereto; (c) adjusting the pH of the suspension to be at least about 9. 5; (d) adding to the suspension at a pH of at least about 9. 5 a selective flocculation polymer which facilitates separation of the separable impurity from the kaolin by flocculating the kaolin and allowing the separable impurity to be or remain deflocculated; (e) allowing the suspension at a pH of at least about 9.

US Patent:

45184917, May 21, 1985

Filed:

Sep 13, 1982

Appl. No.:

6/417663

Inventors:

Bomi M. Bilimoria - Tennille GA
Anthony A. May - Sandersville GA

Assignee:

Anglo-American Clays Corporation - Sandersville GA

International Classification:

B03D 114

US Classification:

209166

Abstract:

Aliphatic complex phosphate esters or salts thereof, of a non-ionic surface active compound, are utilized together with aliphatic fatty acids as collector agents during flotation for removing titanium-based impurities from kaolin clays in a froth flotation process.

US Patent:

57139989, Feb 3, 1998

Filed:

Feb 14, 1995

Appl. No.:

8/388354

Inventors:

Dickey S. Shurling - Sandersville GA
Teresa Anderson Rhodes - Sandersville GA
Connie Carol Brown - Sandersville GA
Ronald Wayne Underwood - Tennille GA
William Leonard Garforth - Sandersville GA
Anthony Allan May - Sandersville GA

Assignee:

ECC International Inc. - Roswell GA

International Classification:

C04B 1404

US Classification:

106486

Abstract:

An improvement is disclosed applicable to the method for producing a calcined kaolin by the steps of wet beneficiating a crude kaolin to form a slurry of the beneficiated kaolin; dewatering the slurry to form a substantially dry calciner feed; and calcining the feed at a temperature of at least 1450. degree. F. by passing a stream of hot gases through a calciner in which the kaolin feed is resident, whereby an exhaust stream of hot gases is generated which entrains quantities of partially calcined and hydrous kaolin pigment fines. The improvement, enabling useful application of the kaolin pigment fines, comprises recovering the kaolin pigment fines from the exhaust stream for use in papermaking. The fines can be recovered at a wet scrubber, and after being partially dewatered, shipped directly as a product slurry to the paper maker.