METHOD OF MANUFACTURING COAL BRIQUETS Russian patent published in 1997 - IPC

FIELD: solid fuel production. SUBSTANCE: method includes dehydration of coal slurry to 10-35% moisture, agitation of coal particles and mineral constituent of original slurry, subsequent molding of dehydrated slurry with grain- size composition minus 1 mm at least 90% with total ash content 30- 70% and silica and/or alumina content in ashes 17-50% under pressure 0.001-20 MPa, and final heat treatment at 200-700 C for 1-60 min in non-oxidative medium. According to invention, coal slurry additionally contains at least 25% of cakeable coals. In this case briquet is strong, porous, water-resistant, with low content of moisture, organic and volatile substances and has optimal shape- forming surface. Briquet keeps its integrity when transported and under unfavorable atmosphere action. EFFECT: improved consumer's quality. 3 cl, 1 tbl