INFLUENCE OF ADDED COKE DUST AND PYRITE ON THE YIELD AND CHARACTERISTICS OF COKING INTERMEDIATES FROM LOW-RANK BITUMINOUS COAL

Low-rank bituminous coal and its blends with 2.5 wt% of coke dust and with a mixture of 2.5 wt% of coke dust and 0.25 wt% of pyrite were pyr olysed in a quartz reactor taking 20-25 g samples. In the presence of the additives some changes were observed in the yields of solid, liqui d and gaseous products of pyrolysis in the 350-450-degrees-C range. Th e additives also influenced the mesophase composition. The formation o f substances soluble in dimethylformamide but insoluble in hexane and chloroform (alpha-fraction) was shifted to higher temperatures of pyro lysis by the additives. This effect resulted in increases in coke stre ngth and anisotropy.