ASTM_D_3173_-_11.pdf

Designation:D317311Standard Test Method forMoisture in the Analysis Sample of Coal and Coke1This standard is issued under the fixed designation D3173;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 test method covers the determination of moisture inthe analysis sample of coal or coke.It is used for calculatingother analytical results to a dry basis.When used in conjunc-tion with the air drying loss as determined in accordance withMethod D2013 or Practice D346,each analytical result can becalculated to an as-received basis:1.2 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:2D346 Practice for Collection and Preparation of CokeSamples for Laboratory AnalysisD2013 Practice for Preparing Coal Samples for AnalysisD3180 Practice for Calculating Coal and Coke Analysesfrom As-Determined to Different BasesD3302 Test Method for Total Moisture in Coal3.Summary of Test Method3.1 Moisture is determined by establishing the loss inweight of the sample when heated under rigidly controlledconditions of temperature,time and atmosphere,sampleweight,and equipment specifications.4.Significance and Use4.1 Moisture as determined by this test method is used forcalculating other analytical results to a moisture free basisusing procedures in Practice D3180.Moisture percent deter-mined by this test method may be used in conjunction with theair-dry moisture loss determined in Method D2013 and TestMethod D3302 to determine total moisture in coal.Totalmoisture is used for calculating other analytical results to“asreceived”basis using Practice D3180.Moisture,ash,volatilematter,and fixed carbon percents constitute the proximateanalysis of coal and coke.5.Analysis Sample5.1 The analysis sample is that sample which has beenpulverized to pass 250-m(No.60)sieve as prepared inaccordance with Practice D346 or Method D2013.6.Apparatus6.1 Drying Oven,for coal samples:6.1.1 For determining the moisture of coal,the oven shall beso constructed as to have a uniform temperature in all parts,have a minimum of air space,and be capable of temperatureregulation between the limits of 104 and 110C.It may be ofthe form shown in Fig.1.Provision shall be made for renewingthe preheated air in the oven at the rate of two to four times aminute,with the air dried as defined in 7.1.6.1.2 In the oven shown in Fig.1,the door should contain ahole of approximately 3.2 mm(18in.)in diameter near thebottom to permit a free flow of air through the oven space.6.2 Drying Oven,for coke samples.For determining themoisture of coke,an ordinary drying oven with openings fornatural air circulation and capable of temperature regulationbetween limits of 104 and 110C may be used.6.3 Capsules,with covers.Aconvenient form,which allowsthe ash determination to be made on the same sample,is aporcelain capsule,22 mm(78in.)in depth and 44 mm(134in.)in diameter,or a fused silica capsule of similar shape.Thesecapsules shall be used with a well-fitting flat aluminum cover,illustrated in Fig.2.Platinum crucibles or glass capsules withground-glass caps may also be used.They should be as shallowas possible,consistent with convenient handling.7.Reagents7.1 Dry AirAir used to purge the drying oven should bedried to a moisture content of 1.9 mg/L or less.(Dewpoint 10C or less.)Any desiccant or drying method capableof achieving this degree of dryness is suitable.7.2 DesiccantsMaterials suitable for use in the desiccatormay be chosen from the following:1This 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 April 1,2011.Published April 2011.Originallyapproved in 1973.Last previous edition approved 2008 as D3173 03(2008).DOI:10.1520/D3173-11.2For 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 7.2.1 Anhydrous Calcium Sulfate(0.004 mg/L).7.2.2 Silica Gel.7.2.3 Magnesium Perchlorate(0.0005 mg/L).7.2.4 Sulfuric Acid,Concentrated(0.003 mg/L).7.2.5 The desiccant must be kept fresh enough to assure thatthe air in the desiccator is dry as defined in 7.1.Values inparentheses()are literature values for the residual amount ofmoisture in air at equilibrium with these desiccants.(