Process for preparing a meta-kaolin white pigment from kaolinite

US5674315A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Ernst Bareuther · Rockenberg, DE
• Jochen Kauper · Maintal, DE
• Werner Stockhausen · Bad Vilbel, DE
• Martin Rahn · Frankfurt am Main, DE

Key dates

• Filing date: Jun 7, 1996
• Grant date: Oct 7, 1997
• Expiry date: Jun 7, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2004/62
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A fluidized bed reactor is supplied with fuel, oxygen-containing gas, and kaolinite, which contains water of crystallization. At least 80% by weight of the kaolinite have particle sizes in the range from 0.1 to 3 mm. A fluidized bed at temperatures in the range from 850.degree. to 950.degree. C. is formed in the fluidized bed reactor. A meta-kaolin white pigment which contains water of crystallization not in excess of 2% by weight is withdrawn from the fluidized bed reactor.