Process and plant for producing metal oxide from metal salts

US8460624B2 · kind B2 · utility

Assignee

• Outotec Oyj · FI

Inventors

• Michael Missalla · Oberursel, DE
• Pekka Hiltunen · Frankfurt am Main, DE
• Roger Bligh · Frankfurt am Main, DE
• Erwin Schmidbauer · Burgkirchen an der Alz, DE
• Cornelis Klett · Koblenz, DE
• Guenter Schneider · Lorsch, DE

Key dates

• Filing date: Dec 18, 2009
• Grant date: Jun 11, 2013
• Expiry date: Dec 18, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01F7/445
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for producing metal oxide from a metal salt includes supplying a first part of the metal salt to a hydrate drier so as to indirectly heat the first part of the metal salt in the hydrate drier using a heat transfer medium from a first stage of a multi-stage indirect cooler so as to dry the first part of the metal salt in the hydrate drier and so as to control a waste gas temperature of the process. A second part of the metal salt is guided as a partial stream past the hydrate drier. The metal salt is preheated in a first preheating stage and precalcined in a second preheating stage. The metal salt and a fluidizing gas having a temperature of 150° C. or less are supplied to a fluidized bed reactor so as to calcine the metal salt to form a metal oxide product. The metal oxide product is cooled in at least one suspension heat exchanger and then in the multi-stage indirect cooler.