ASTM_D_2862_-_10.pdf

Designation:D286210Standard Test Method forParticle Size Distribution of Granular Activated Carbon1This standard is issued under the fixed designation D2862;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.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This test method covers the determination of the particlesize distribution of granular activated carbon.For the purposesof this test,granular activated carbon is defined as a minimumof 90%of the sample weight being retained on a 180-mStandard sieve.AU.S.mesh 80 sieve is equivalent to a 180mStandard sieve.NOTE1For extruded carbons,as the length/diameter ratio of theparticles increases,the validity of the test results might be affected.1.2 The data obtained may also be used to calculate meanparticle diameter(MPD),effective size,and uniformity coef-ficient.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3.1 ExceptionAll mass measurements are in SI unitsonly.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D2652 Terminology Relating to Activated CarbonD2854 Test Method for Apparent Density of ActivatedCarbonE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE300 Practice for Sampling Industrial ChemicalsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Summary of Test Method3.1 A known weight of granular activated carbon is placedon the top sieve of a stacked set of U.S.Standard sieves andshaken under standard conditions for a specific time period,after which the weight percent of the total retained on eachsieve and bottom pan is determined.4.Significance and Use4.1 It is necessary to know the distribution of particle sizesof granular activated carbon in order to provide proper contactof gases or liquid in a packed bed of the material.Changes inparticle size distribution can affect the pressure drop across thebed and the rate of adsorption in a bed of a given size.4.2 Mean particle diameter is a property of activated car-bons that influences pressure drop.4.3 Effective size and uniformity coefficient are two prop-erties of activated carbons often of interest in municipal watertreatment applications where control of particle size is ofinterest.5.Apparatus5.1 Mechanical Sieve Shaker3This is a mechanically op-erated sieve shaker that imparts a uniform rotating and tappingmotion to a stack of 8-in.(203-mm or equivalent)sieves asdescribed in 5.2.The sieve shaker should be adjusted toaccommodate the desired number of sieves,receiver pan,andsieve cover.The bottom stops should be adjusted to give aclearance of approximately116in.(1.5 mm)between the uppercarrying plate stops and the sieve cover plate,so that the sieveswill be free to rotate.The sieve shaker shall be powered with14-hp(186-W)electric motor producing 1725 to 1750 rpm.The1This 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 April 1,2010.Published July 2010.Originallyapproved in 1970.Last previous edition approved in 2009 as D2862 97(2009)1.DOI:10.1520/D2862-10.2For 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.3The Tyler Ro-Tap Model RX-19-1 has been used in developing this test.Newermodels may not produce the same separations(Model RX-19-2 is equivalent toModel RX-19-1).This model is available from Fisher Scientific,Pittsburgh,PA15238.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 sieve shaker should produce 140 to 160 raps per minute withthe striker arm and 280 to 320 rotating motions per minute ofthe sieve stack.The cover plate shall be fitted with a corkstopper that shall extend14618in.(6.35 6 3.18 mm)abovethe metal recess.At no time shall any material other than corkbe permitted.5.2 SievesU.S.Standard sieves or equivalent conformingto Specification E11.The sieves shall be either 2 in.(51 mm)(full height)or 1 in.(25 mm.)(half height)in height,and 8 in.(203 mm or equivalent)in