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Jun 27 1984 ularly inferior grindability Hardgrove grindability index HGI being low line is added and the mixture is milled to give a coal water slurry

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Hardgrove Grindability Index short HGI is a measure for the grindability of coal Grindability is an index therefore it has no unit The smaller the HGI the harder is coal texture and less grindable is the coal Grindability is an important factor for the design a coal mill

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Hardgrove Grindability testing Bulk density Davis tube testing Drop shatter and size analysis ASH TESTING ASH FUSION Understanding the behavior of coal ash at high temperature is critical in determining ideal coals for steam power generation The ash fusion test gives an indication of the softening and melting nbsp

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Grindability Tests

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Hardgrove Grindability Index analysis is the ASTM method of determining the hardness of coal when pulverized for steam generation or size reduction Grindabilities typically range on coal from 35 – 110 Harder and less grindable coal rates a smaller HGI index number

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Hardgrove Grindability Index Standard Reference Samples In 1930 and 1931 Ralph Hardgrove a mechanical engineer Overview The Hardgrove Grindability Index Standard