ASTM_D_8339_-_20.pdf

Designation:D833920Standard Test Method forThe Analysis of Flue Gas Desulfurization Solids by MacroThermogravimetric Analysis1This standard is issued under the fixed designation D8339;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 This instrumental test method covers the determinationof free moisture,gypsum(CaSO42H2O),calcium sulfitehemihydrate(CaSO3H2O),calcium hydroxide(Ca(OH)2),calcium carbonate(CaCO3),and ash in flue gas desulfurizationsolids using a macro thermogravimetric analyzer.1.2 This instrumental test method is not applicable tothermogravimetric analyzers using microgram size samples.1.3 UnitsThe values stated in SI units are to be regardedas standard.The values given in parentheses after SI units areprovided for information only and are not considered standard.1.4 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.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:2D121 Terminology of Coal and CokeD3180 Practice for Calculating Coal and Coke Analysesfrom As-Determined to Different BasesD8146 Guide for Evaluating Test Method Capability andFitness for UseE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1601 Practice for Conducting an Interlaboratory Study toEvaluate the Performance of an Analytical Method3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 flue-gas desulfurization solids,ngenerally are finelydivided materials containing various amounts of free moisture.3.1.1.1 DiscussionThe origin of the materials is dewa-tered slurries resulting from the absorption of sulfur dioxide byslurries of lime or limestone fines in a flue gas desulfurizationprocess.3.1.2 free moisture,nthe moisture that evolves fromflue-gas desulfurization solids,clay materials,hydrated lime,and similar materials,when they are heated at temperaturesranging from 45 C to 60 C until a constant mass is reached.3.1.2.1 DiscussionFree moisture in these materials is notthe same as the free moisture in coal,as defined in TerminologyD121.3.2 For definitions of other terms used in this test method,refer to Terminology 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.Macro thermogravimetric analy-sis(macro TGA)of flue gas desulfurization solids(FGD-Solids)uses a sample mass of approximately 1 g.In a typicalanalysis,the temperature is normally ramped from ambient toa specific temperature and held at that temperature for aprescribed length of time,and the correspondent specimenmass is repeatedly recorded by the instrument.4.2 FGD-Solids components:free moisture,gypsum,cal-cium sulfite hemihydrate,calcium hydroxide,calciumcarbonate,and ash are sequentially determined in a singlemulti-step heating program.The analysis of a particular com-ponent is complete when the specimen reaches a constant massor at the end of the step.4.3 Free Moisture is determined by measuring the massloss,caused by evaporating free water from the analysisspecimen when heated to 50 C.1This test method is under the jurisdiction of ASTM Committee D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.29 on MajorElements in Ash and Trace Elements of Coal.Current edition approved July 1,2020.Published September 2020.DOI:10.1520/D8339-20.2For 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.4.4 Gypsum,CaSO42H2O,is determined by measuring themass loss,caused by removal of gypsum hydrate water fromthe analysi