Method for manufacturing coal agglomerates for use in direct...

C - Chemistry – Metallurgy – 10 – L

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C10L 9/08 (2006.01) C10L 5/06 (2006.01) C21B 13/00 (2006.01)

Patent

CA 2212104

A method for manufacturing coal agglomerates for use in a direct smelting reducing furnace is disclosed, in which a fine coal is agglomerated at a high temperature in a simple manner, or anthracite or low free swelling coal having a low free swelling index is mixed with the fine coal, and the mixture is agglomerated at a high temperature, thereby turning the low quality coal to useful purpose. The present invention is characterized in that a fine coal having a free swelling index of 3.0 or more and a particle size of 8 mm or less, or the fine coal mixed with 70 weight % of anthracite or a low free swelling coal, is maintained at 600 ~C or over for 5 minutes or more, thereby manufacturing coal agglomerates for use in a direct smelting reducing furnace.

L'invention concerne un procédé pour fabriquer des agglomérés de charbon destinés à un four réducteur à fusion directe, dans lequel des particules fines de charbon sont agglomérées à haute température d'une manière simple, ou bien de l'anthracite ou un charbon à gonflement libre limité est mélangé avec les particules fines de charbon, et le mélange est aggloméré à haute température, ce qui permet de valoriser un charbon médiocre. Les particules fines de charbon selon l'invention ont un indice de gonflement libre minimal de 3,0 et une granulométrie maximale de 8 mm, ou bien la poudre fine de charbon mélangée avec 70 % en poids d'anthracite ou d'un charbon à faible gonflement est maintenue à 600 ·C ou plus pendant 5 minutes ou plus, ce qui donne des agglomérés de charbon destinés à une utilisation dans un four réducteur à fusion directe.

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