Hardgrove Grindability Scale
gypsum hardness scale by hardgrove populareducation. Mar 8, 2012 Ranking system is relative on a scale of 1 to 4; 1 being easy to grind, and 4 being more . with silicate minerals (alite, belite) and thereby reduce their hardness. . In our laboratory the grindability of cement clinker is determined by grinding clinker plus gypsum while Hardgrove grindability index (HGI). Read More
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