ASTM_D_5159_-_21.pdf

Designation:D515921Standard Guide forDusting Attrition of Granular Activated Carbon1This standard is issued under the fixed designation D5159;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 guide presents a procedure for evaluating theresistance to dusting attrition of granular activated carbons.Forthe purpose of this guide,the dust attrition coefficient,DA,isdefined as the weight(or calculated volume)of dust per unittime,collected on a preweighed filter,in a given vibratingdevice during a designated time per unit weight of carbon.Theinitial dust content of the sample may also be determined.Granular activated carbon is defined as a minimum of 90%being larger than 80 mesh(0.18 mm)(see Test MethodsD2867).1.2 The values stated in SI units are to be regarded as thestandard.The inch-pound units given in parentheses are forinformation only.1.3 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.1.4 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:2D2854 Test Method for Apparent Density of ActivatedCarbonD2867 Test Methods for Moisture in Activated CarbonE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE300 Practice for Sampling Industrial Chemicals3.Summary of Guide3.1 A known volume of known weight of the granularactivated carbon is placed in a sample holder and vibrated atconstant acceleration(g)for a known time.The dust is carriedby an air stream passing through the vibrating sample and isthen collected on a preweighed filter.The quantities of dustcollected in six 10-min intervals are determined by weighingson an analytical balance.4.Significance and Use4.1 Three forces can mechanically degrade a granular acti-vated carbon:impact,crushing,and attrition.Of these three,attrition,or abrasion,is the most common cause of dustformation in actual service.Published test procedures todetermine the“hardness”of activated carbons produce resultsthat in general cannot be correlated with field experience.Forexample,the ball-pan hardness test applies all three forces tothe sample in a variable manner determined by the size,shape,and density of the particles.The“stirring bar”abrasion testmeasures attrition so long as the particle size is smaller than 12mesh.There is some evidence,however,that the results of thistest method are influenced by particle geometry.The procedureset forth in this guide measures the effect of friction forcesbetween vibrating or slowly moving particles during the testand may be only slightly dependent on particle size,shape,anddensity effects.5.Apparatus5.1 Vibrating Table,capable of providing an RMS(rootmean square)acceleration of 40 m/s/s(4 g).5.2 Test Cell,such as shown in Fig.1,preferably made ofaluminum or other electrically conductive material.5.3 Piezoelectric Accelerometer,capable of measuring anRMS acceleration chosen by the user.Avalue of 40 m/s/s(4 g)is suitable when using the apparatus in Figs.1 and 2.5.4 Signal Conditioner,to interface the accelerometer withan AC millivolt meter,capable of producing a linear outputvoltage from 0 to 1 V-ac,proportional to the acceleration.5.5 Voltmeter,0 to 1 V-ac.5.6 Ammeter,ac,0 to 1000 mA accurate to 1 mA.1This guide is under the jurisdiction of ASTM Committee D28 on ActivatedCarbon and is the direct responsibility of Subcommittee D28.04 on Gas PhaseEvaluation Tests.Current edition approved June 1,2021.Published June 2021.Originallyapproved in 1991.Last previous edition approved in 2020 as D5159 04(2020).DOI:10.1520/D5159-21.2For 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.15.7 Variable Transformer,0 to 120 V.5.8 Timer Control,0 to 120 min.5.9 Rubber