Process and plant for thermal decomposition of aluminium chloride hydrate into aluminium oxide

US11591233B2 · kind B2 · utility

Assignee

• Metso Outotec Finland Oy · FI

Inventors

• Agnes Von Garnier · Oberursel, DE
• Linus Perander · Sandefjord, NO
• Gunter Schneider · Marburg, DE
• Peter Sturm · Karben, DE

Key dates

• Filing date: Dec 6, 2021
• Grant date: Feb 28, 2023
• Expiry date: Dec 6, 2041

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E60/36
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a process and its relating plant for thermal conversion of aluminum chloride hydrate into aluminum oxide and gaseous hydrogen chloride. In a first step, aluminum chloride hydrate is fed into a decomposition reactor where it is heated to a temperature between 120 and 400° C. Afterwards, the partially decomposed aluminum chloride hydrate is finally calcined to aluminum oxide at a temperature between 850 and 1200° C. in a second reactor. The aluminum chloride hydrate is admixed with aluminum oxide in an intensive mixer with a mass ratio between 1:1 and 10:1 aluminum chloride hydrate to aluminum oxide for using a fluidized bed reactor as a decomposition reactor.