UNIT 1 HARDGROVE GRINDABILITY INDEX

With a blend of coals with similar HGI’s the difference is small. When a blend of coals with ... at constant HGI Mill Capacity % 130 120 110 100 90 80 70 ... pilot scale wet ball mill. This covered a very wide range of values but was apparently not precise

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low low rather safe very low B.) Hand grinding (wet or dry) very low very high low rather unsafe low C.) Three component milling without ball mill: high low low unsafe low D.) CIA method without preparing materials (in ball mill) medium medium high safe medium E.) Three component ball milling (up to three hours) medium - low low medium unsafe

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Hardgrove grindability index (HGI) - SlideShare

May 01, 2013 The moisture content and the humidity in which HGI has been conducted affect the results. 6. HARDGROVE GRINDABILITY INDEX (HGI) 7. FEATURES OF HGI MACHINE NO OF BALLS = 8 BALLS MATERIAL = Iron DIAMETER OF EACH BALL = 25.4 0.003 mm NO OF REVOLUTIONS = 60 NO OF LOADED RINGS = 3 WT OF EACH LOADED EING =600gm 8

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10.1016/j.coal.2007.06.005 | 10.1016/j.coal ... - DeepDyve

Jun 11, 2020 For example, a 53 HGI coal requires 2.5 times the numbers of revolutions in a ball mill than a 110 HGI coal to achieve 80% passing 200 mesh ( Fitton et al., 1957 ). As an approximation of mill behavior, Lowe (1987) estimated a 1% loss of mill throughput per 1 HGI unit decrease

A new approach to enhance the selectivity of liberation

Dec 31, 1993 The Hardgrove Grindability tests show that the HGI of a KY. No. 9 coal increases from 41 for the untreated coal to 60-90 after swelling pretreatment for a short time. Batch stirred ball mill grinding results demonstrate that this new technique has a great potential in reducing the energy consumption of fine coal grinding

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Investigation into the applicability of Bond Work

Bond Work Index (BWI) & Hardgrove Grindability Index (HGI) tests for biomass & coal. BWI can predict the potential for mill choking of biomass in a tube and ball mill. HGI is a poor method of predicting grindability of biomass in vertical spindle mills. Pellets should be composed of pre-densified particles close to the target size

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Ball Mill Design/Power Calculation LinkedIn Wi = work index, which is a factor relative to the kwh/short ton required to reduce a given material from theoretically infinite size to 80% passing 100 microns P = size in microns of the screen opening which 80% of the product will pass

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