Upgrading solid fuels
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United States of America Patent
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Jul 19, 1988
Issued Date -
N/A
app pub date -
Dec 8, 1986
filing date -
Feb 17, 1983
priority date (Note) -
Expired
status (Latency Note)
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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.
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