PETROGRAPHY AND COKING POTENTIALITY OF INDIAN COALS

被引:4
作者
GHOSH, TK
机构
[1] Geology Department, Calcutta University
关键词
D O I
10.2113/gsecongeo.64.6.683
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A systematic investigation of the petrographic characters (maceral composition, maceral association and reflectance in oil of vitrinite) of Indian coals (both Permian and Lower Tertiary) has been undertaken to study (a) the petrographic makeup of Indian coals, (b) the difference in the petrographic nature of coals of different coking property and (c) the relationship between the petrographic analyses (maceral composition and reflectance) and coke stability. The author has also attempted to assess the coking potentiality of coal or blend from petrographic analyses. Microscopic examinations reveal that Indian coals have varying maceral composition. Petrographically the coals are of four different types (1) high reactive content, low average Ro; (2) high reactive content, high average Ro; (3) low to medium reactive content, low average Ro and (4) low to moderate reactive content, medium to moderately high average Ro. The frequency distribution of Ro values in all the coals is unimodal. Excepting some of the coals occurring in type 4 the other coals do not form standard metallurgical coke on straight charge. From petrographic analyses it is possible to predict the strength of coal or blends that show unimodal frequency distribution of Ro values and which have average Ro within a range of 0.80 to 1.50 and contain 45 to 60 percent of reactives. Stability of coal is maximum when the reactive content is about 60 percent and the average Ro is about 1.25. Coke stability decreases on either side of the above values of reactive content and average Ro. Quality and quantity of the different coals to be used in a blend can be ascertained from petrographic analyses of the individual coals. © 1969 Society of Economic Geologists, Inc.
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页码:683 / &
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