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R&D, Tata Steel Limited, India
*Corresponding author: Veerendra Singh, R&D, Tata Steel Limited, Jamshedpur, India
Submission: October 03, 2018;Published: November 26, 2018
ISSN : 2578-0255Volume2 Issue4
These studies have been carried out to compare the grinding characteristics of different morphological mineral matters. Coal, dolomite, manganese and iron ores samples were ground using a ball mill in different grinding conditions (dry and wet) and at different critical speed (R45%, R70% and R90%) during wet grinding. Results are compared considering the relative impact on particle size and shape. Materials were ground in a lab scale ball mill for 2hours with steel balls and size analysis of products were carried out using different size sieves (1, 0.5, 0.25, 0.15, 0.106 and 0.053mm). Microscopic studies were carried out to know the effect of different grinding conditions on particle properties. Light, fine grain and soft dolomite shows only 8% reduction in D80 whereas heavy, friable and hard manganese ore shows a 29% reduction in D80 for similar dry and wet grinding conditions. It was found that light materials are less sensitive towards mill speed (R) during wet grinding. Energy calculations indicated that wet grinding is less efficient for low density and soft materials than high density and hard materials. The relative increase in the fineness (D80) for coal, dolomite, manganese ores and iron ores were 8.9, 6.5, 25, and 15.8%, respectively for wet and dry grinding. Variation in D/L indicates that abrasion is a prominent phenomenon in dry grinding and chipping is more prominent in wet grinding especially for material with bedded structures.
Keywords: Grinding; Minerals matters; Morphology; Shape; Size reduction
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