Upgrading solid fuels
AssigneesThe University of Melbourne, CRA Services Limited
InventorsKay F. Harvey, Theodore V. Verheyen, Reginald B. Johns, Alan L. Chaffee, Alan S. Buchanan, David A. Cain
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Abstract
Densified coal pellets of improved physical properties and enhanced calorific value are produced by a process which includes subjecting coal to a shearing-attritioning step followed by extrusion and drying steps, characterised by incorporating an additive into the coal that is subject to the said shearing-attritioning step, said additive being chosen from one or more of the group consisting of: alkali metal hydroxides, alkaline earth metal hydroxides, ammonium hydroxide, alkali metal carbonates, alkaline earth carbonates, oxides of base metals, oxides of transition metals, and small molecule carbonyl compounds.
Claims16
Process for production of densified coal pellets of improved physical properties which includes subjecting brown coal to a shearing-attritioning step followed by extrusion and drying, characterised by incorporating an additive into the coal that is subject to the said shearing-attritioning step, said additive being chosen from one or more of the group consisting of:
- alkaline earth metal hydroxides,
- ammonium hydroxide,
- oxides of base metals, and
- oxides of transition metals.
In a process for treatment of brown coal which comprises subjecting the said brown coal to shearing forces to produce a wet plastic mass which is capable of conversion by subsequent compaction and drying into a fuel of increased and enhanced calorific value, the improvement which comprises effecting said step of subjecting the brown coal to shearing forces in the presence of an additive which enhances the bonding between sheared coal particles in said mass.
A process according to calim 12 in which the additive comprises an alkaline earth carbonate.
Dependencies are inferred from the claim text.