As grindability depends on many unknown factors, HGI is determined empirically using a sample mill according to the following procedure: Procedure of measurement 50 g of air dried coal featuring a grain size in the range between 06 and 118 mm are filled into the sample mill and a weight is put on the mill's grinding stone
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Get PriceFor the first grinding cycle, the mill is started with an arbitrarily chosen number of mill revolu - tions At the end of each grinding cycle, the entire product is discharged from the mill and is screened on a test sieve (Pi) Standard choice for Pi is 106 micron The oversize fraction is returned to the mill for the second run together with fresh
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Get PriceHGI gives the comparative ease of grinding with reference to standard coal The higher the HGI the lower is the power requirements, and the finer the particle size HGI represents a fuel that is easier to grind An HGI-measuring machine is a miniature ball mill type of pulverizer Herein, a standard mass (50 g) of coal is grounded for a given .
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Get PriceConversely the mill capacity falls when grinding coal with a lower HGI The curve shows variation in mill capacity with HGI with capacity being nominally set at HGI of 50 03 Note that the three curves shown below show the general shape and direction of a mill response to a change in HGI but would be somewhat different for mills from different
Get PriceWorn grinding elements cannot create the maximum pressures required to reach maximum grinding effectiveness Lower HGI fuels of course, exacerbate the true capacity problem when the grinding elements are worn Illustration of the “grinding zone” on a MPS mill Horsepower/Ton Consumption Below is a typical HP/ton consumption chart based on our
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