1、Designation: D5158 98 (Reapproved 2013)Standard Test Method forDetermination of Particle Size of Powdered ActivatedCarbon by Air Jet Sieving1This standard is issued under the fixed designation D5158; the number immediately following the designation indicates the year oforiginal adoption or, in the c
2、ase 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 test method covers the determination of the particlesize of powdered activated carbo
3、ns using an air-jet sievedevice. For purposes of this test method, powdered activatedcarbon is defined as activated carbon in particle sizes predomi-nantly smaller than 80 mesh.1.2 The values stated in SI units are to be regarded as thestandard. The inch-pound units given in parentheses are forinfor
4、mation 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.
5、Referenced Documents2.1 ASTM Standards:2D2652 Terminology Relating to Activated CarbonE11 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 a
6、n Interlaboratory Study toDetermine the Precision of a Test Method3. Terminology3.1 Definitions Terms relating to this test method aredefined in Terminology D2652.4. Summary of Test Method4.1 A weighed sample of as-received powdered activatedcarbon is placed in a test sieve that is inserted in the s
7、ieveholder of the air-jet sieve assembly. Air is passed through thesieve from a slowly-rotating nozzle to fluidize the sample for agiven period of time. Exit air flow removes undersized par-ticles downward through the test sieve to a collection canister.The amount of carbon retained on the test siev
8、e is weighed andthe percent passing the test sieve is computed by difference.For a particle size distribution, the test must be repeated usingsieves with different openings.5. Significance and Use5.1 The particle size of powdered activated carbon issometimes used to evaluate filter cake filtration r
9、ates and thefilter penetration in filtering applications. The selection andhandling of powdered activated carbon, and operation ofprocesses using powdered activated carbon, requires theknowledge of the particle size.NOTE 1Relative humidity (RH) can affect the repeatability andaccuracy of this test.
10、Activated carbon not at equilibrium with the RH ofthe ambient air may lose or gain weight accordingly, dependent uponwhether or not the carbon picks up or loses moisture.6. Apparatus6.1 Air-Jet Sieve Assembly.6.2 Wire Cloth Sieves, bronze or stainless steel (stainlesssteel sieves preferred), 200 and
11、 325 mesh, in accordance withSpecification E11. The sieves shall be 203 mm (8 in.) indiameter.6.3 Brush, soft bristle.6.4 Balance, with a sensitivity of 1.0 mg.6.5 Ultrasonic Bath, capable of cleaning 203-mm (8-in.)diameter sieves.7. Sampling7.1 Activated carbon is not strictly a chemically and phys
12、i-cally homogeneous material. To enable performing meaningfultests within the stated tolerances of the ASTM test methods, itis essential that sampling be performed to obtain as represen-tative a sample as possible. When a small amount of samplerepresents tons of material, the collection, mixing, and
13、 prepa-ration of samples is extremely important. The practice de-scribed in Practice E300 is suitable to ensure that sampling and1This test method is under the jurisdiction of ASTM Committee D28 onActivated Carbon and is the direct responsibility of Subcommittee D28.02 on LiquidPhase Evaluation.Curr
14、ent edition approved Nov. 1, 2013. Published December 2013. Originallyapproved in 1991. Last previous edition approved in 2005 as D5158 98 (2005).OI: 10.1520/D5158-98R13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annu
15、al 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 States1sample preparation of activated carbon is appropriate for theperformance of t
16、his test method. In absence of followingPractice E300, a detailed specific sampling and sample prepa-ration procedure, suitable to the parties involved, needs to beprepared.8. Procedure8.1 Determine the size of the test sample in accordance withASTM STP 447B.3In deciding on the size of a test sample
17、,consideration must be given to the character of the material, itsscreenability, and the range of particle sizes present.8.2 Weigh the established weight of a representative sampleof powdered activated carbon, which has been taken andprepared in strict accordance with Practice E300 or a mutuallyagre
18、ed upon sampling and sample preparation procedure, to thenearest 10 mg and record.NOTE 2A10 g sample has been satisfactory for some types ofpowdered activated carbon. For greater accuracy it is advisable to controllaboratory environmental conditions and to pre-equilibrate carbonsamples.8.3 Transfer
19、the weighed sample into the required wire clothtest sieve that has previously been placed in the sieve holder ofthe air-jet sieve assembly.8.4 Install the plastic sieve cover in the test sieve.8.5 Allow the air-jet sieve to operate for 10 min 6 10sata pressure drop greater than 152 mm (6 in.) H2O.8.
20、6 When the air-jet sieve has stopped, remove the plasticcover and carefully brush any material adhering to the coverinto the sieve.NOTE 3Static electricity that can affect the repeatability and accuracyof this test may be generated during the testing. If it is apparent that anexcessive amount of mat
21、erial was adhering to the plastic cover, repeat 8.5of this procedure.8.7 Remove the test sieve from the air-jet assembly andquantitatively transfer the material into a weighing pan, weighto the nearest 1.0 mg, and record.9. Calculation9.1 Calculate the percent passing through the test sieve asfollow
22、s:P, % passing 5S 2 R!S3100whereP = percent of sample passing through the test sieve,R = weight of sample remaining on test sieve, g, andS = weight of sample used, g.10. Report10.1 Report the following information:10.1.1 Source of the sample,10.1.2 Type or designation of the powdered activatedcarbon
23、,10.1.3 Name of the carbon supplier,10.1.4 Supplier grade designation,10.1.5 Supplier lot and batch number,10.1.6 Particle size (percent passing the test sievedesignation),10.1.7 Name of the agency and technician making the test,and10.1.8 Sample identification number and the date of the test.11. Pre
24、cision and Bias11.1 Precision:11.1.1 Interlaboratory Test Program An interlaboratorystudy was run in which representative samples of four types ofactivated carbon (one coal-based and three wood-based) weretested for particle size by four laboratories with each laboratorymaking three observations of
25、each activated carbon type overthree days. Practice E691 was followed for the design andanalysis of the data with the exception that the results fromonly four laboratories were used.11.1.2 Test ResultThe precision information given inTable 1 in units of measurement (percentage weight passingthrough
26、the indicated sieve) is for the comparison of two testresults, each of which is the average of three test determina-tions.11.2 BiasThis test method has no bias because theparticle size analysis is defined only in terms of this testmethod.12. Keywords12.1 activated carbon; powdered activated carbon3M
27、anual on Test Sieving Methods, ASTM STP 447B, ASTM International, WestConshohocken, PA, 1985, pp. 910.TABLE 1 Test ResultsAMaterial AABBCCDDU.S. Sieve No. 200 325 200 325 200 325 200 325Average Test Value 92.8 78.0 95.1 73.4 88.6 76.6 99.8 92.495 % Repeatability Limit(within labs)0.4 0.6 0.3 0.6 0.6
28、 0.9 0.06 0.2495 % Reproducibility Limit(between labs)2.8 5.7 2.4 6.5 4.2 2.2 0.15 3.9AThe terms repeatability limit and reproducibility limit are used as specified inPractice E177. The respective standard deviations among the results may beobtained by dividing the above limit values by 2.8.D5158 98
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