Process for upgrading low rank carbonaceous material

Details Process for upgrading low rank carbonaceous material Process for upgrading low rank carbonaceous material

2005-01-25

2005-01-25

Toomer, Cephia D. (Department: 1714)

Fuel and related compositions

Consolidated solids

'low-rank' coal

C044S595000, C044S599000, C044S608000, C044S620000, C044S626000, C044S628000

Reexamination Certificate

active

06846339

ABSTRACT:
A process for upgrading brown coal is disclosed, including providing at least two converging surfaces defining a nip, wherein at least one of the surfaces is rollable in a direction toward the nip; feeding the brown coal to the nip where, by the rolling action of the rollable surface, the brown coal is subjected to shearing stresses, causing attritioning of the microporous structure of the brown coal and the release of water contained in the micropores; and continuing the shearing attritioning until the brown coal forms into a plastic mass. Processes for the production of char are also disclosed utilizing as feed material pellets formed from the upgraded brown coal produced by the above process, as well as a process for recovering metal from a metal containing material.

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