Grindability index of coal is an important technological parameter to understand the behaviour and assess the relative hardness of coals of varying ranks and grades during comminution This is usually determined by Hardgrove Grindability Index (HGI), which involves requirement of a costly grinding equipment and accessories not readily.
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ASTM D409 : Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method English , (Hardgrove Grindability Index (HGI)).
Hardgrove Grindability Tester Hardgrove Grindability measures relative ease of pulverization of coals compared to standard coals The resulting Hardgrove Grindability Index (HGI) provides a measure of energy required in a grinding process or a measure of yield for a given energy input.
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