ASTM D5159-04(R2020) pdf free download

ASTM D5159-04(R2020) pdf free download.Standard Guide for Dusting Attrition of Granular Activated Carbon
1. Scope
1.1 This guide presents a procedure for evaluating the resistance to dusting attrition ofgranular activated carbons. For the purpose of this guide, the dust attrition coefficient, DA, is defined as the weight (or calculated volume) of dust per unit time, collected on a preweighed filter, in a given vibrating device during a designated time per unit weight of carbon. The initial 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 Methods D2867). 1.2 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory 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 the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Summary of Guide
3.1 A known volume of known weight of the granular activated carbon is placed in a sample holder and vibrated at constant acceleration (g) for a known time. The dust is carried by an air stream passing through the vibrating sample and is then collected on a preweighed filter. The quantities of dust collected in six 10-min intervals are determined by weighings on an analytical balance.
4. Significance and Use
4.1 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 dust formation in actual service. Published test procedures to determine the “hardness” of activated carbons produce results that in general cannot be correlated with field experience. For example, the ball-pan hardness test applies all three forces to the sample in a variable manner determined by the size, shape, and density of the particles. The “stirring bar” abrasion test measures attrition so long as the particle size is smaller than 12 mesh. There is some evidence, however, that the results of this test method are influenced by particle geometry. The procedure set forth in this guide measures the effect of friction forces between vibrating or slowly moving particles during the test and may be only slightly dependent on particle size, shape, and density effects.
8. Procedure
8.1 Measure a known volume (about 100 mL) ofthe sample into a tared, graduated cylinder using the method and apparatus described in Test Method D2854 and weigh to the nearest 0.1 g. If the average nominal particle size of the sample is less than 12 mesh, a 50-mL sample may be preferred. 8.1.1 Reproducibility in duplicate or quadruplicate determi- nations may be improved by taking two or four times the volume of the given sample and making one subdivision by careful coning and quartering. 8.1.2 A second convenient procedure is to use a miniature sample divider and divide the sample once or twice as desired. Mount Micro splitter 7 for mineral sampling on a vibrating table to ensure an equal division of all particles, especially the fines. 8.2 Calculate the apparent density of the sample using Test Method D2854. 8.3 Quantitatively transfer the sample into the sample holder section of the test cell. 8.4 Weigh the particulate filter to 0.1 mg. 8.5 Insert the weighed particulate filter into the apparatus. 8.6 Assemble the test cell assembly and secure it to the vibrator table. 8.7 Set the timer control to 10 min. Note—10 min is used only as an example to illustrate the procedure for calculating DA in Section 9. The user ofthis guide may select another time interval. 8.8 Start the air flowing, then adjust to draw the desired volumetric flow of air through the sample.