ASTM_D_4371_-_D_4371M_-_06_2019e1.pdf

Designation:D4371/D4371M06(Reapproved 2019)1Standard Test Method forDetermining the Washability Characteristics of Coal1This standard is issued under the fixed designation D4371/D4371M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEThe designation was editorially updated to dual and other editorial changes were made throughout in December2019.INTRODUCTIONThe American Society for Testing and Materials has recognized the need for a standard procedureto conduct washability analyses that will serve as an aid to technical communication amongindividuals and organizations that supply,purchase,and utilize coal.This test method standardizesprocedures utilized for performing washability analyses,the data from which can be used forinterpreting preparation plant efficiency,for determining preparation plant design,and for determiningthe potential recovery and quality of coal reserves.1.Scope1.1 This test method describes procedures for determiningthe washability characteristics of coarse-coal fractions andfine-coal fractions.Each sample being tested can have morethan one coarse-coal size fraction and more than one fine-coalsize fraction(see Annex A1).Each such size fraction has anupper size limit and a lower size limit,neither of whichoverlaps with the next larger nor smaller size fraction.(SeeTest Method D4749.)1.2 While,in general,this test method has useful applicationin determining the washability characteristics of low-rankcoals,in the strictest sense,it is not necessarily the mosttechnically correct test method to determine washability char-acteristics of low-rank coals because of problems relative to theloss of moisture through drying during sample preparation andanalysis.Methods that are directly applicable to low-rank coalsare to be developed.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be combined.1.4 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety,health,and environmental practices and determine the appli-cability of regulatory limitations prior to use.For specifichazard statements,see Section 8 and Appendix X1.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D2013 Practice for Preparing Coal Samples for AnalysisD2234/D2234M Practice for Collection of a Gross Sampleof CoalD4749 Test Method for Performing the Sieve Analysis ofCoal and Designating Coal SizeD6883 Practice for Manual Sampling of Stationary Coalfrom Railroad Cars,Barges,Trucks,or StockpilesE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE100 Specification for ASTM HydrometersE126 Test Method for Inspection,Calibration,and Verifica-tion of ASTM HydrometersE323 Specification for Perforated-Plate Sieves for TestingPurposes1This test method is under the jurisdiction of ASTM Committee D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.07 on PhysicalCharacteristics of Coal.Current edition approved Nov.1,2019.Published December 2019.Originallyapproved in 1984.Last previous edition approved in 2012 as D4371 06(2012).DOI:10.1520/D4371_D4371M-06R19E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.Terminology3.1 Definitions:3.1.1 coal washabilitythe determination of the theoreticallimits for the removal of mineral impurities from coal bybeneficiation processes that rely on specific gravity separa-tions.3.2 Definitions of Terms Specific to This Standard:3.2.1 washability analysis of coalthe analysis of thespecific gravity distribution of chemical and physical charac-teristics