Hardgrove Grindability Index (short HGI) is a measure for the grindability of coal. Grindability is an index, therefore it has no unit. The smaller the HGI, the harder is coal texture and less grindable is the coal. Grindability is an important factor for the design a coal mill.
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Get PriceHardgrove Grindability Index of Coal. HGI value is also influenced by the petrographic nature (types of macerals present) of the coal. HGI of bright coals, containing 8990% Carbon, can reach a maximum value of 105. But for anthracite, the HGI value has a low value of 35.
Get PriceHard Groove Index (HGI) bulkonline Forums . 3 replies from April 2007; Dear all, Can any one tell what is hard groove index (HGI) and what is its value for Iron ore, coking coal and lime stone
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Get PriceMay 30, 2017· The laboratory is equipped with ultramodern equipment and machinery for gross sample preparation till pulverization, proximate analysis, gross and net calorific values of coal, carbon hydrogen nitrogen sulphur analysis. Also full ash analysis, hard groove grindability index, ash fusion temperature etc can also be tested in the new lab.
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Get PriceOct 22, 2016· In this study empirical relationship of HGI (Hard Groove Grindability Index) was established in terms of proximate analysis of coal. HGI is important parameter at mining applications such as excavation, crushing, grinding, dust generation. HGI has long been researched and empirical equations evaluating coal proximate analysis data has been proposed.
Get PriceCALCULATIONSThe hard groove grind ability index of coal is thancalculated using the following = 13 + wWhere,w = weight of the test sample passingthrough 75μ sieve and retained on 300 μsieve after grinding in the HGImachine. 10. FACTORS AFFECTINGTHE GRINDABILITY VALUES1.
Get PriceMohs Vickers hardness comparison: This chart compares the hardness of index minerals of the Mohs hardness scale (an integer scale) with their Vickers hardness (a continuous scale). Mohs hardness is a resistance to being scratched, while Vickers hardness is a resistance to indentation under pressure.
Get PriceCoal grindability is a complex property related to coal hardness, strength, tenacity and fracture. All these properties are influenced by coal rank, petrography, and the type and distribution of minerals (Sun and Horsfield, 2005). The grindability of a coal as measured by the Hardgrove Grindability Index (HGI) is of great interest since it is
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