Process and plant for producing calcine products

US8337801B2 · kind B2 · utility

Assignee

• Outotec Oyj · FI

Inventors

• Joerg Hammerschmidt · Rückingen, DE
• Bernd Kerstiens · Rosbach, DE
• Peter Sturm · Karben, DE

Key dates

• Filing date: Jul 10, 2009
• Grant date: Dec 25, 2012
• Expiry date: Sep 10, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/129
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for producing calcine products includes dead roasting a metal sulfide concentrate having a low sulfur content. The concentrate is roasted in a circulating fluidized bed at a temperature of about 950 to 1050° C. A waste gas of the fluidized bed is passed through at least one of a recuperator and a Venturi drier so as to respectively provide at least one of a preheating of at least a portion of air fluidizing the fluidized bed and a drying of at least a portion of the concentrate to be roasted. The calcine product obtained in the fluidized bed with a sulfur content of less than 1 wt-% is provided for further processing.