Method for preparing spheroidal alumina

US4542113A · kind A · utility

Assignee

• Condea Chemie GmbH · DE

Inventors

• Arnold Meyer · Marne, DE
• Klaus Noweck · Brunsbüttel, DE

Key dates

• Filing date: Mar 25, 1983
• Grant date: Sep 17, 1985
• Expiry date: Mar 25, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/21
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

For the preparation of spheroidal alumina, an alumina sol having a solids content of more than 20 to 40% by weight of alumina is prepared from alumina hydrate, which consists of boehmite/pseudo-boehmite, by thorough stirring in aqueous dilute acid, and the alumina sol is caused in the presence of 1 to 10% by weight of urea to drop into a forming column whose top portion is filled with a liquid hydrocarbon and whose bottom portion is filled with an aqueous solution of ammonia and which is held at room temperature, and the thus formed spheroidal particles are dried and activated. The resultant spheroidal particles may also be subjected to a per se known aging treatment.