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grindability index iron ore orissa

Sep 25, 2010 · Grindability Index is calculated as, HGGI = 13 +6.93 × W (−200 mesh) or HGGI = 4.87 × W (−30 mesh) − 95.85. Where W is the weight of material passing through (−200 mesh) and (−30 mesh), respectively. Grinding machine use eight 1 in. balls rolling on a stationary ring and driven from top by a rotating element

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