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impact of hardgrove grindability index on mill performance

Oct 15, 2015· TheHardgrove Grindability Index(HGI) test is based on Rittinger’s theory that “the work done in grinding is proportional to the new surface produced” , . The index varies from 20 to 110, with a lower HGI indicating a coal is harder to grind and more energy will be required to reach the required degree of fineness.

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