Role of the coal rank in the formation of coking batch

The Maiganga Coal Deposit: Bituminous, Sub-Bituminous or Lignite?

“…Looking closely at the result (Table 4.1) and based on ASTM coal classification (Table 4.3), the Maiganga coal apparently falls within the lignite rank [26][27], as this is the range of its calorific value and fixed carbon. Samples from locations A1 and A2 have 4981.5 j/g and 4237.5 j/g calorific values.…”

Plastometric method in the identification of coal from new and old deposits

“…This assertion was made earlier in [1,2]: "Because y provides little information, producers of coal for the coke industry are able to engage in deceptive rank assignment. "…”

“…Of course, the 1 mm deviation permitted in the standard leaves scope for rank manipulation, as noted in [1][2][3][4]. The method and apparatus used for plastometric analysis are of critical importance here.…”