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    • 1. 发明专利
    • ASSESSMENT OF DEGRADATION OF NONCAKING COAL
    • JPS59120691A
    • 1984-07-12
    • JP23000082
    • 1982-12-27
    • SUMIKIN KAKO KK
    • MINAMIZAWA ISAMU
    • C10B57/00C10L5/00G01N33/22
    • PURPOSE:To assess a degree of deterioration of coal in a simple process, by forming pulverized low-grade coal under pressure into a columnar shape with a predetermined density, followed by quick dry distillation and burning, classifying it on a rotary drum tester and calculating the weight percentage of particles having a specified size. CONSTITUTION:Pulverized noncaking coal is formed under pressure into a columnar shape with a predetermined density and a consistent moisture content. The formed coal is dry distilled quickly and is burned. The resultant coke is placed in a rotary drum tester and is classified by use of a 1mm. mesh sieve. A percentage ratio of the weight of particles of the tested coke having a particle size of 1mm. or larger to that of coke before testing is calculated and the degree of deterioration is assessed by using their ratio as an index. The method makes it possible to define the degree of deterioration of low-grade coal by oxidation (heat generation) which can not be measured on the basis of maximum fluidity as determined in the fluidity test or total expansivity as determined by expansivity test as specified in JIS M8801.