Pelletizing lignite
OwnerMehmet A. Gokselinventor
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Abstract
Lignite is formed into high strength pellets having a calorific value of at least 9,500 Btu/lb by blending a sufficient amount of an aqueous base bituminous emulsion with finely-divided raw lignite containing its inherent moisture to form a moistened green mixture containing at least 3 weight % of the bituminous material, based on the total dry weight of the solids, pelletizing the green mixture into discrete green pellets of a predetermined average diameter and drying the green pellets to a predetermined moisture content, preferrably no less than about 5 weight %. Lignite char and mixture of raw lignite and lignite char can be formed into high strength pellets in the same general manner.
Claims9
A method for forming high strength pellets from lignite comprising the steps of:
- (a) comminuting run of the mine raw lignite into finely divided form without substantial drying;
- (b) uniformly blending a sufficient amount of an aqueous base bituminous emulsion with said finely-divided raw lignite to form a moistened mixture containing at least 3 weight % of the bituminous materials, based on the total dry weight of the solids in said mixture;
- (c) pelletizing said moistened mixture in a balling means to form discrete, generally spherical, green pellets and having a moisture content of about 25 to about 45 weight %;
- and
- (d) drying said green pellets.
Dependencies are inferred from the claim text.