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Chemical analyses and thin section petrographic analyses were used to characterize the limestone samples. The results of the laboratory ball mill test were compared to the results of an industrial grinding test, the Bond Work Index, for six samples which covered the grindability range.

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In coal utilization: Grindability …is used to calculate the Hardgrove grindability index (HGI). The index is used as a guideline for sizing the grinding equipment in a coal-preparation plant.

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Chemical analyses and thin section petrographic analyses were used to characterize the limestone samples. The results of the laboratory ball mill test were compared to the results of an industrial grinding test, the Bond Work Index, for six samples which covered the grindability range.

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