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Coal Composition, Coal Plasticity, and Coke Strength.

Wu WRK; Frederic WH
NTIS: PB 221 754 :88 pages
Results of linear correlations of two to four variables by the least- squares method are presented. The variables include 63 parameters representing coal composition, coal plasticity, and coke strength. The composition parameters are based on chemical analyses; the plasticity parameters, on three plastometer and dilatometer tests and four miscellaneous tests; and the coke-strength parameters, on ASTM indices. Seventy-two to 84 plastic coals were used in the plasticity and carbonization tests; 43 nonplastic or weakly plastic coals were used in the coal-band studies. Plots of relations between volatile matter, carbon, and oxygen contents of 1,860 coals and the 84 coals used are shown. Similar plots between volatile matter and hydrogen or atomic h/c of the 84 coals are also included. Significance of regression coefficient signs for coal composition parameters in the significant correlations found are discussed. Based on these significances, the following relations are shown: (1) coke strength versus average aromaticity, or mineral matter content, of the parent coal; (2) characteristic temperatures of the plastometer and dilatometers, the free-swelling index, or the gray- king type versus average hydroaromaticity of the coal; and (3) nontemperature parameters of the plastometer and dilatometers versus the physical properties of a certain group of compounds from thermal decomposition of coal. Significances between the positions of coals in the coal band and the aforementioned relations are also discussed. A structural theory of coal plasticity is proposed. Applications
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B 661
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NTIS: PB 221 754
Page last reviewed: December 10, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division