Method and apparatus for refining coal

C - Chemistry – Metallurgy – 10 – L

Patent

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C10L 9/02 (2006.01) C10L 5/00 (2006.01)

Patent

CA 2730965

A method of processing coal to remove sulfur and other contaminants by mixing coal in a solution of aqueous ammonia having a selected concentration range (preferred range of 3%-5%) of ammonia to water in a reaction vessel. The mixing causes the solution to be brought into contact with the surfaces and pores of the coal. The process is monitored to detect when the concentration of aqueous ammonia in the reaction vessel has fallen below the selected range, and aqueous ammonia with an ammonia concentration in or above the selected range is fed into the reaction vessel to return the solution to within the selected range. The cleaned coal may be rinsed and dried, or dried without rinsing to form an ammonia coating on the coal surfaces and pores. Several plant layouts to practice the method are described.

La présente invention concerne un procédé permettant de traiter le charbon pour éliminer le soufre et dautres contaminants en mélangeant le charbon dans une solution dammoniaque ayant une plage de concentration choisie (plage préférée comprise entre 3 % et 5 %) dammoniac à leau dans une cuve de réaction. Le mélange provoque la mise en contact de la solution avec les surfaces et les pores du charbon. Le procédé est surveillé afin de détecter le moment où la concentration en ammoniaque dans la cuve de réaction passe en dessous de la plage sélectionnée, et une solution dammoniaque, dont la concentration en ammoniac est comprise ou est supérieure à la plage sélectionnée, est introduite dans la cuve de réaction afin de replacer la solution dans les limites de la plage choisie. Le charbon nettoyé peut être rincé et séché, ou séché sans rinçage afin de former un enrobage ammoniaqué sur les surfaces et dans les pores du charbon. Linvention concerne également plusieurs schémas dinstallation permettant de mettre en uvre le procédé.

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