ASTM_D_5159_-_04_2014.pdf

Designation:D515904(Reapproved 2014)Standard 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 guide does not purport to address all of the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this guide to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.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 Table3,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 Accelerometer4,capable of measuring anRMS acceleration chosen by the user.Avalue of 40 m/s/s(4 g)is suitable when using the apparatus in Fig.1 and Fig.2.5.4 Signal Conditioner5,to interface the accelerometer withan AC millivolt meter,capable of producing a linear outputvoltage from 0 to 1 V-ac,proportional to the acceleration.1This test method is under the jurisdiction of ASTM Committee D28 onActivated Carbon and is the direct responsibility of Subcommittee D28.04 on GasPhase Evaluation Tests.Current edition approved July 1,2014.Published September 2014.Last previousversion approved in 2009 as D5159 04(2009).DOI:10.1520/D5159-04R14.2For 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.3A Buffalo Dental Manufacturing Co.,(Underhill Blvd.,Syosset,NY 11791)vibrator,Model No.1,rated 40 W at 115 V,60 Hz,and a Syntron Model J-1Avibrating jogger,rated 30 W at 115 V,60 Hz,have been found suitable for thispurpose.4An Endevco accelerometer,Model No.2251,has been found suitable for thispurpose.5An Endevco Model 4416 signal conditioner,battery operated,has been foundsuitable for this purpose.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE1234in.(69.9 mm)inside diameter by 3 in.(76.2 mm)outside diameter by116in.(1.6 mm)thick.NOTE2 Specification E11 wire cloth,250 m,stainless wire,3 in.(76.2 mm)diameter.NOTE337%open area,fabricated from 24 gage stainless steel with 0.45 in.(11.4 mm)diameter holes on 0.066 in.(1.68 mm)centers,square grid3 in.(76.2 mm)diameter.FIG.1 Dust Attrition Cell(full scale)NOTE1An Endevco accelerator,