Method for introducing a granular ore into a roasting kiln

US6916357B2 · kind B2 · utility

Inventors

• Michael Ströder · Neu-Anspach, DE
• Horst Zingrebe · Wiesbaden, DE
• Hubert Vollmer · Mahopac, US

Key dates

• Filing date: Nov 27, 2001
• Grant date: Jul 12, 2005
• Expiry date: Nov 27, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F27M2003/03
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

Granular ore or ore concentrate is charged into a furnace for calcining the ore at temperatures of 400 to 1050° C., the ore forming a stationary fluidized bed in the furnace. The ore is thrown onto the fluidized bed through an opening in the furnace housing disposed above the fluidized bed, the ore being accelerated by blades of a rotating impeller. The impeller is disposed outside the furnace in the vicinity of the opening of the housing. Preferably, the rotational speed of the impeller is variable, and the impeller is movable and/or pivotable with respect to the furnace.