GB1059679A - A method of manufacturing briquettes - Google Patents

Abstract

Fuel briquettes are made by pressing and heat-treating a mixture of a carbonaceous fuel (coal or coke), with (a) urea and formaldehyde, and (b) spent sulphite lye, optionally with (c) an acidic catalyst. The urea may be partly replaced by melamine, e.g. up to 10%. The weight ratio of (a) to (b) is preferably in the range 0.2 to 1 to 3 to 1, and (a), (b) and (c) together preferably constitute 2 to 8% b.w. of the total dry mixture, (a) and (b) being in the form of at least 50% b.w. aqueous solutions. The catalyst may be an organic or inorganic acid, e.g. formic, oxalic, acetic, boric or phosphoric, or a salt, e.g. NH4Cl. After mixing, the composition is hot or cold-pressed, and heated, e.g. at 100 DEG to 200 DEG C. to form a resin. Specific examples, using coal as the base, are described.ALSO:Ore briquettes are made by pressing and heat-treating a mixture of the material to be briquetted with (a) urea and formaldehyde, and (b) sulphite lye, optionally with (c) an acidic catalyst. The urea may be partly replaced by melamine, e.g. by up to 10%. The weight ratio of (a) to (b) is preferably in the range 0.2:1 to 3 : 1, and (a), (b) and (c) together preferably form 2 to 8% b.w. of the total dry mixture, (a) and (b) being in the form of at least 50% b.w. aqueous solutions. The catalyst may be an organic or inorganic acid, e.g. formic, oxalic, acetic, boric or phosphoric, or a salt, e.g. NH4Cl. After mixing, the composition is hot or cold-pressed, and heated, e.g. at 100 DEG to 200 DEG C., to form a resin.