astm d409 standard test method for grindability of,may 15, 2008 astm d409, 2008 edition, may 15, 2008 - standard test method for grindability of coal by the hardgrove-machine method this test method 2 covers the determination of the relative grindability or ease of pulverization of coals in comparison with coals chosen as standards. a prepared and sized sample receives a definite amount of grinding energy in a miniature pulverizer, and the size.grindability laboratory and analysis technology pilot,grindability home pilot plant laboratory and analysis technology grindability bond test. determining the bond work index is a standardized method for characterizing the comminution performance of mineral samples. cemtec uses this method for designing rod and ball mills. the comminution performance is, just like the desired comminution step.
may 01, 2013 the hard grove method ismostly used to determine the grindability ofcoal, but also in determining grindability ofother raw materials. bonds method is used toevaluate the rock grindability. 4. hardgrovegrindability index (hgi) the hardgrove grindability index is designed todetermine the ease with which coal can bepulverized.
4 relation between the hgi grindability value and wi work index by bond both tests serving for determination of grindability are widely used in many industrial areas. the hardgrove method of specification of grindability is used mostly for determination of grindability of coal, but also in determining grindability of other raw materials.
one is the hardgrove grindability index and the other the bond work index. the hardgrove index is determined using the astm method d 40971. it involves grinding 50g of the material, e.g. coal, of specified size (1630 mesh cut) in a specified ball-and-race mill for 60 revolutions.
oct 07, 2019 the amount of sample that passes through the sieve is used to calculate the hardgrove grindability index. the results are compared against a standard sample to provide the index and used to determine how much energy and expense will be needed to grind down a certain coal for a particular use (astm method d409-12 american society for testing
the bond work index is a measure of ore resistance to crushing and grinding and is determined using the bond grindability test. its value constitutes ore characteristic and is used for industrial comminution plants designing. determining the bond work index value is quite complicated, timeconsuming and requires trained operating personnel and therefore is subjected to errors. a quick method
bond work index formula equation. jul 15 2021 in the standard a c closed circuit ball mill grindability test the work index is found from where pi is the opening in microns of the sieve mesh tested and gbp is the net grams of mesh undersize produced per revolution of the 12 x 12 test ball mill the closed circuit 80 passing size p averages p1/log 20 for all sizes larger than 150 mesh
astm d500319 standard test method for hardgrove. 11 this test method covers the determination of the hardgrove grindability index hgi of those petroleum cokes that contain no dedusting additive the procedure for this test method is the same as in test method ns of this test method contain the significance and use of the hgi of petroleum coke preliminary sample preparation procedures and
the hardgrove test is a standard method used wide-ly in the coal industry. to determine the relative grindability of coal, i.e. whether it is easy or difficult to pulverize, the hardgrove grindability index (hgi) can be estimated from the test. a higher index indicates the coal is easier to pulverize.
bs 1016-112 1995 methods for analysis and testing of coal and coke part 112 determination of hardgrove grindability index of hard coal. milton keynes bsi. 4 vuthaluru, h.b. et al., 2003. effects of moisture and coal blending on hardgrove grindability index of western australian coal. fuel processing technology, 81(1), pp.6776.
application this instrument can be used to test the coal grindability by hardgrove method. hardgrove grindability index tester is a special tester for testing the grindability of soft coal and blind coal. takes grinding law as the theoretical basis (the energy consumed in coal grinding in proportional to the new surface area of coal dust). conformance to standards gb/t2565-1998 coal hardgrove
the hardgrove grindability index is calculated on four splits (or portions), two each taken from the two reserved cans. the results are averaged to give the index for the entire lot. cans of standard reference sample are shipped to customers upon request, along with a questionnaire designed by astm to obtain data on the quality of the sample.
graduations are from 0 to 100 in 0.2 divisions, but readings may be estimated to 0.1 moisture content. it is a portable unit, supplied complete with one infra-red lamp and thermometer. suitable for operation on 230 v, 50 hz, single phase, ac supply. capacity 5g approx.
the relative grindability of coal by harold j. sloman1 and arthur c. barnhart,2 pittsburgh, pa. this paper points out the need for a standard method of determining the relative grinding characteristics of various coals. several methods have been advanced and the authors herein are proposing another which they
grindability of coal is generally estimated by two indices (a) work index in which energy consumption for obtaining product of constant fineness is measured and (b) grindability index in which fineness of final product is measured for same grinding work of the standard samples.
mar 01, 2003 the relationships between the bond method parameters (w i and g bg) and dynamic elastic parameters (g d, e d and k d) are examined. after determination of these relationships, the aim was to find a practical way of determination of bond grindability and the work index.
hardgrove grindability index (hgi) of coals. for training of the neural networks, gradient descent methods such as backpropagaition (bp) method are used frequently. however they originally showed good performance in some non-linearly separable problems, but have a very slow convergence and can get stuck in local minima.
title of legally binding document method of determination of grindability index number of amendments equivalence superceding superceded by legally binding document step out from the old to the new--jawaharlal nehru invent a new india using knowledge.--satyanarayan gangaram pitroda
jan 01, 2019 astm d5003, 2019 edition, january 1, 2019 - standard test method for hardgrove grindability index (hgi) of petroleum coke. this test method covers the determination of the hardgrove grindability index (hgi) of those petroleum cokes that contain no dedusting additive. the procedure for this test method is the same as in test method d409.
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 full text not available from this repository.request a copy
variability study of bond work index and grindability index on various critical metal ores gloria g. garca 1, josep oliva 2, eduard guasch 2, hernn anticoi 3, alfredo l. coellovelzquez 4 and juan m. menndezaguado 1, 1 escuela politcnicade mieres, universityof oviedo,gonzalo gutirrez quirs,
standard test method for grindability of coal by the hardgrove-machine method1 this standard is issued under the xed designation d 409 the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. a number in parentheses indicates the year of last reapproval. a
the bond standard grindability test has been described in detail by deister (1987) and levin (1989) who proposed method to determine the grindability of fine materials (wills, 2006). abdullahi (1997) examined the work index of ashaka limestone in gombe state using the modified bonds method.
Lorem ipsum dolor sit amet, consectetur adipi scing elit, sed do eiusmod tempor incidi dunt ut labore et dolore magna aliqua.
Address High and New Industrial Zone, Kexue Revenue, Zhengzhou, China
E-mail [email protected]
Online consulting Get Latest Price