Sinha, N.C. and Moitra, A.K. and Majumdar, S. (1962) Some Methods for Calculating Hardgrove Grindability Index of Coals. Journal of Mines, Metals & Fuels, 10 (11). pp. 1-6. ISSN 0022-2755

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From a study of large number of determined values of Hardgrove Grindability Index (H.G.I.) of all major types of Indian coals in has been found that H.G.I. of coals is mainly dependent on two factors: (i) rank of the coal and (ii) the amount of ash in it. It has been established that volatile matter together with the moisture of coals (both reported at 60% R. H. and at 40º C) is very closely associated with the carbon content (d.m.f.) which is one of the parameters for measuring the degree of coalification of coals. An equation has been evolved for estimating H.G.I. of coal from a knowledge of their volatile matter plus moisture ® and ash (A) contents (moisture, ash and volatile matter percentages being reported at 60% R.H. and at 40º C basis). The formula HGI=105-R(1.16+0.002R) 00.4 A, may be used for estimating H.G.I. for preliminary selection of coals for pulverized fuel fired furnaces. Further, by an algebraic simplification of the original Hardgrove Equation, a formula has been deduced for calculating H.G.I. of coals from the weight of the coal particles above 200 ASTM sieve, left after the specified Hardgrove test (and which is actually weighed), instead of from the weight of the coal particles below 200 ASTM sieve, estimated indirectly. This has also lead to the construction of a standard table which almost eliminates the calculation part of the H.G.I. determination.

Item Type: Article
Subjects: Chemicals and Liquid Fuels
Depositing User: Dr. Satyendra Kumar Singh
Date Deposited: 06 Aug 2012 11:35
Last Modified: 06 Aug 2012 11:35

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