Upgrading solid fuels

US4758244A · kind A · utility

Assignees

• The University of Melbourne · AU
• CRA Services Limited · AU

Inventors

• Kay F. Harvey · Elmore, AU
• Theodore V. Verheyen · Elmore, AU
• Reginald B. Johns · Melbourne, AU
• Alan Loyd Chaffee · Bundaberg, AU
• Alan S. Buchanan · Elmore, AU
• David A. Cain · Melbourne, AU

Key dates

• Filing date: Dec 8, 1986
• Grant date: Jul 19, 1988
• Expiry date: Dec 8, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10L5/10
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

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.