1、Designation:D409/D409M16Standard Test Method forGrindability of Coal by the Hardgrove-Machine Method1This standard is issued under the fixed designation D409/D409M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revi
2、sion.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.INTRODUCTIONThis test method is structured into the follo
3、wing parts:The body of the test method discusses the scope,referenced documents,significance and use,apparatus,gross samples,preparation of test samples,procedure,calculation and report,precision andbias,and keywords.Annex A1 contains the method to obtain and prepare coal feedstock for potential use
4、 as HGI RMs(reference materials).Annex A2 contains the method to divide and containerize the candidate HGI RMs(candidate HGIRMs)from the feedstock prepared in Annex A1.Annex A3 contains the method for homogeneity testing of the candidate HGI RMs containerized inAnnex A2.Annex A4 contains the method
5、for determining the Hardgrove grindability index(HGI)to beassigned to each lot of the candidate HGI RMs.Annex A5 contains the method used to calibrate a Hardgrove grindability machine using theprimary or secondary HGI RMs.Annex A6 contains the method for determining the moisture content of the 1.18
6、0.60 mm(No.16 30)test sample.1.Scope1.1 This test method2covers the determination of therelative grindability or ease of pulverization of coals incomparison with coals chosen as standards.A prepared andsized sample receives a definite amount of grinding energy ina miniature pulverizer,and the size c
7、onsist of the pulverizedproduct is determined by sieving.The resultant size consist isused to produce an index relative to the ease of grindingHardgrove Grindability Index(HGI).1.1.1 Some coals,such as some high-volatile bituminous,subbituminous,and lignite coals,can undergo physical changeas the na
8、tural or seam moisture is released during handling andpreparation.This change is often sufficient to alter the grind-ability characteristics that will be reported when tested in thelaboratory and could produce different indices dependent onthe conditions of drying and the moisture level of the 1.18
9、0.60 mm(No.16 30)(see Test Method D4749)materialsused for the test.Therefore,the repeatability and reproducibil-ity cited in this test method may not apply for these high-volatile bituminous,subbituminous,and lignite coals.1.2 The values stated in either SI units or inch-pound unitsare to be regarde
10、d separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1This test method is under the jurisdiction of ASTM Committee D05 on
11、 Coaland Coke and is the direct responsibility of D05.07 on Physical Characteristics ofCoal.Current edition approved Sept.1,2016.Published September 2016.Originallyapproved in 1951.Last previous edition approved in 2012 as D409 121.DOI:10.1520/D0409_D0409M-16.2For information concerning the experime
12、ntal work on which this test method isbased,see paper by Hardgrove,R.M.,“Grindability of Coal,”Transactions,American Society of Mechanical Engineers,Vol 54,F.S.P.,p.37,1932.D05.07 on Physical Characteristics on Coal is conducting ongoing investigationsin regard to quality control during preparation,
13、distribution,and use of standardreference materials and during preparation and testing of actual samples.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 1.3 This standard does not purport to address all of thesafety concerns,if any,associ
14、ated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D2013 Practice for Preparing Coal Samples for AnalysisD2234/D
15、2234M Practice for Collection of a Gross Sampleof CoalD3302 Test Method for Total Moisture in CoalD4749 Test Method for Performing the Sieve Analysis ofCoal and Designating Coal SizeD6609 Guide for Part-Stream Sampling of CoalD6708 Practice for Statistical Assessment and Improvementof Expected Agree
16、ment Between Two Test Methods thatPurport to Measure the Same Property of a MaterialD6883 Practice for Manual Sampling of Stationary Coalfrom Railroad Cars,Barges,Trucks,or StockpilesD7430 Practice for Mechanical Sampling of CoalE11 Specification for Woven Wire Test Sieve Cloth and TestSieves2.2ISO 13909 Hard Coal and CokeMechanical SamplingISO 18283 Hard Coal and CokeManual SamplingISO 3310-1 Test SievesTechnical Requirements andTesting,Part 1:Test Sieves of Metal Wire ClothISO 17043 Conformity
