ASTM D5159-04 (2020) pdf free.Standard Guide for Dusting Attrition of Granular Activated Carbon.
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).
The values stated in Sl units are to be regarded as thestandard.The inch-pound units given in parentheses are forinformation only.
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 appropriate safety，health,and environmental practices and determine the applicability of regulatory limitations prior to use.This international standard was developed in accordance 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.
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.
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.ASTM D5159 pdf download.