ASTM_D_7582_-_15.pdf

Designation:D758215Standard Test Methods forProximate Analysis of Coal and Coke by MacroThermogravimetric Analysis1This standard is issued under the fixed designation D7582;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These instrumental test methods cover the determinationof moisture,volatile matter,and ash,and the calculation offixed carbon in the analysis of coal and coke samples preparedin accordance with Practice D2013 and Practice D346.1.2 These instrumental test methods are not applicable tothermogravimetric analyzers using microgram size samples.1.3 Test Methods D3173,D3174,and D3175 shall beconsidered the referee test methods.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated 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:2D121 Terminology of Coal and CokeD346 Practice for Collection and Preparation of CokeSamples for Laboratory AnalysisD2013 Practice for Preparing Coal Samples for AnalysisD3173 Test Method for Moisture in the Analysis Sample ofCoal and CokeD3174 Test Method for Ash in the Analysis Sample of Coaland Coke from CoalD3175 Test Method for Volatile Matter in the AnalysisSample of Coal and CokeD3176 Practice for Ultimate Analysis of Coal and CokeD3180 Practice for Calculating Coal and Coke Analysesfrom As-Determined to Different BasesD3302 Test Method for Total Moisture in CoalD5016 Test Method for Total Sulfur in Coal and CokeCombustion Residues Using a High-Temperature TubeFurnace Combustion Method with Infrared AbsorptionE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 For definitions of terms used in this test method,refer toTerminology D121.4.Summary of Test Method4.1 In thermogravimetric analysis,the mass of a sample ina controlled atmosphere is recorded repeatedly as a function oftemperature or time,or both.In macro thermogravimetricanalysis,a sample size of approximately 1 g is used.All massmeasurements are conducted by the system.In a typicalanalysis,the temperature is normally ramped from ambient toa specific temperature and held at that temperature for aprescribed length of time.The mass change is recordedrepeatedly during the entire procedure.For the thermogravi-metric analysis of coal and coke samples the moisture and ashanalyses are complete when the sample reaches a constantmass as defined in the instrumental operating parameters.Alternatively,the measurement of moisture and ash can beconsidered complete after heating the sample for a fixed periodof time.In the volatile matter analysis,the samples are weighedafter heating to 950C and held at this temperature for 7 min.4.2 Moisture is determined by measuring the loss in mass ofthe analysis specimen of coal or coke when heated underspecified conditions of temperature,time,atmosphere,speci-men mass,and equipment specifications.4.3 Volatile matter is determined by measuring the loss inmass of the analysis specimen of coal or coke when heatedunder rigidly controlled conditions.The measured mass loss isused to calculate the volatile matter after correcting for themoisture content.4.4 Ash is determined by measuring the mass of the residueremaining after burning the coal or coke specimen under1This test method is under the jurisdiction of ASTM Committee D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.21 on Methods ofAnalysis.Current edition approved May 15,2015.Published June 2015.Originallyapproved in 2009.Last previous edition approved in 2012 as D7582-12.DOI:10.1520/D758215.2For 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 States1 specified conditions of specimen mass,temperature,time,atmosphere,and equipment specifications.4.5 In these test methods,moisture,volatile matter,and ashcan be determined sequentially in a single instrumental proce-dure.Another procedure allows the moisture and ash to bedetermined sequentially.Moisture and ash can also be deter-mined in separate determinations.Ruggedness testing and pastexperiences have shown the volatile matter values determinedon samples without first determining the moisture(drying thesample)are always higher than those