FUEL BRIQUETTE FABRICATION (OPTIONS) Russian patent published in 2005 - IPC

FIELD: shaped solid fuels.

SUBSTANCE: invention relates to fabrication of solid fuels for use in metallurgy, construction, and other industries as well as in heating systems. Fabrication involves dispensing coal fines, binder, and hardener. Binder is urea-formaldehyde resin with urea-to-formaldehyde molar ratio from 1:0.95 to 1:1.5 used in amount 5-15% of the weight of coal fines and hardener is in the form of acids, salts and solutions thereof reducing pH value of resin by 2-4 units and used in amount 0.01-1.0% of the weight of coal fines. According to first option, coal fines are first mixed with hardener during 10 to 120 sec, after which urea-formaldehyde resin is added and the total is stirred for 20 to 160 sec. Resulting mix is molded into briquettes and compacted. According to second option, coal fines are mixed with resin during 10-60 sec and, after addition of hardener, duration of mixing is 10-120 sec.

EFFECT: substantially simplified fabrication of strong, heat-resistant, and low-toxic fuel briquette and reduced power consumption.

4 cl, 2 tbl