1、m 9009276 0020285 57T m Designation:D 431-04/AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race St.,Philadelphia,Pa.49103 Reprinted from the Annual Book of A S W Standards,Copyright ASTM If not listed inthe current combined index,will*peat in the next edition.Standard Test Method for DESIGNATING T
2、HE SIZE OF COAL FROM ITS SIEVE ANALYSIS This standard i s issued under the fued designation D 43 I;the number&mediately following the deggnation 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 rmpprovai.A
3、 supersctipt epsilon(e)indicates an editorial change sn the last revision or reapproval.1.scope 1.1 This test method covers the designation of coal sizes from the results of sieve analysis tests of samples taken to represent the condition of the coal as sold.This test method applies only to naturai
4、continuous ranges of sizes as produced by mining,handling,crushing,screening,etc.In the case of special mixtures,or where the sieve analysis indicates a substantial deviation from a normal gradation of sizes,a sufficiently complete sieve analysis to properly describe the size com-position shail be m
5、ade and reported in accord-ance with Method D 4 1 O.1.2 This test method does not cover the stan-dardization of sieves used in the commercial preparation of coal.1.3 The values stated in inch-pound units are to be regarded as the standard.1.4 This standard may involve hazardous ma-terials,operations
6、,and equipment.This standard does not purport to address all o f the safety prob lems associated with its use.It is the responsibil-ity o f whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability o f regulatory limi-tations prior to
7、 use.2.Applicable Documents 2.1 ASTM Standards:D 3 10 T e s t Method for Size of Anthracite2 D 4 1 O Method for Sieve Analysis of Coal2 E 1 1 Specification for Wire-Cloth Sieves for E 323 Specification for Perforated-Plate Sieves Testing Purposes2 3.Significance and Use 3.1 This test method concerns
8、 the designation of coal into definite size fractions for purposes of characterizing the material for further processing or for commercial purposes.4.Sampling and Sieve Analysis accordance with Method D 4 1 0.4.1 Perform sampling and sieve analysis in 5.Sieves 5.1 Size designations in terms of sieve
9、s of the following series,shall conform to Specifications E 1 1 orE323.5.1.1 Round-Hole Screens:8-in.(.)lhin.(37.5 mm)Gin.(.)ll/+n.(31.5-mm 5-in.f125-mm)1-in.4-in.(i-mm)/*in.Sin.(75-mm)hin.212-in.(63-mm)hin.2-in.(50-mm)5.1.2 Wire-Cloth Sieves with No.4(4.75-mm)No.8(2.36-mm)No.16(1.18-mm)No.30(W m)No
10、.50(3Wpm)No.i00(15O-pm)No.200(75pm)ings:(25.0-mmj(19.0-mm)(12.5-mm)(9.5-mm)Square Open-This test method is under the jurisdiction of ASTM Com-mittee D 5 on Coal and Coke and is the direct responsibility of Subcommittee W5.07 on Physical Characteristics of Coal.Current edition approved Sept.28,1984.P
11、ublished Novem-ber 1984.Onginally published as D 431-36 T.Last previous edition D 43 I-44(1976).for Testing Purposes2 Annual Book o f ASTM Standards,Vol 05.05.1-.NOTICE:This standard has either been superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for
12、the latest information.1 I._.-W 7007276 0020286 Li06$D431 6.SizeDesignation system of size designation:6.1 The designation shall indicate the range of the sue by giving the upper and lower limiting sieves between which more than 80%of the sample is retained by actuai test,the limiting sieves being s
13、elected as follows:6.1.1 The sieve defining the upper limit shall be the smallest sieve of the series given in Section 5 upon which is retained a total of less than 5%of the sample.The sieve defining the lower limit shall be the largest sieve of the series given in Section 5 through which passes a t
14、otal of less than 15%of the sample.6.1.2 The terms for defining sizes shall be written with the upper limiting sieve first,fol-lowed by an X and that foilowed by the lower limiting sieve.The abbreviation in.shall follow the lower limiting sieve but may be omitted&er the upper limiting sieve.For siev
15、es of the U.S.standard sieve series(No.4 and smaller),the abbreviation No.shall be u s e d each time a sieve is indicated.If the total retained on the 8-in.sieve is 5 9 6 or greater,the size shall be des-ignated by the lower limiting sieve preceded by the word plus and followed by an expression in p
16、arenthesis giving the percentage over 8 in.to thenearest 1%.6.1.3 The following examples illustrate the Examples:plus V2 in.(12.5 mm)(10%over 8 in.)plus 4 in.(100 mm)(24%over 8 in.)plus No.16(6%over 8 in.)4 x 2 in.(100 x 50 mm)3 x$5 in.(75 x 12.5 mm)2 in.(50 mm)x No.4 No.4 x No.30 1 in.(25.0 mm)x No.50 NOTE 1-011 the b a s k of the relationship between square-mesh sieves and round-hole screens as deter-mined by tests on coal,No.4 sieve is roughly equivalent to%-in.(6.3-mm)round screen,No.8 to%-i
