Process for calcining an ore-based material

US6318278A · kind A · utility

Assignee

• L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude · FR

Inventors

• Jacques Dugue · Paris, FR
• Thierry Borissoff · Paris, FR
• Ovidiu Marin · Paris, FR
• Ivan Milosavljevic · Thousand Oaks, US
• Dora Sophia Alves · Paris, FR
• Michel Viardot · Paris, FR

Key dates

• Filing date: Jun 22, 2000
• Grant date: Nov 20, 2001
• Expiry date: Jun 22, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F27B7/2033
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

In this process the material is passed through a precalcination device equipped with at least one fuel injector at the outlet of which a fuel injection zone is formed, then the at least partially calcined material is passed into the rotary kiln which at its downstream end, is equipped with a primary combustion unit. At least one oxygen rich fluid with an oxygen concentration by volume higher than that of the products of combustion from the rotary kiln is injected near to the injection zone so that the oxygen rich fluid can supply from 1% to 40%, and preferably form 1 to 10% of the stoichiometric amount of oxygen needed for the combustion of the fuel injected by the injector.