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HGI for coal is determined by grinding 50 g of sample in a ball and ring type mill for 60 coals are easy to grind compared to lignite and anthracite coals Berkowitz, 1979 . Working with Eocene age coals from Indonesia, Moore et al. 1990
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Effects of Microwave and Conventional Drying Methods on Grinding Characteristics of Afsin-Elbistan Lignite. Conference Paper. Full-text available. Jan 2012.
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Hardgrove Grindability Index - Wikipedia
Hardgrove Grindability Index short HGI is a measure for the grindability of coal. Grindability is coal featuring a grain size in the range between 0.6 and 1.18 mm are filled into the sample mill and a weight is put on the mill& 39;s grinding stone.