1、Designation: D 5158 98 (Reapproved 2005)Standard Test Method forDetermination of Particle Size of Powdered ActivatedCarbon by Air Jet Sieving1This standard is issued under the fixed designation D 5158; the number immediately following the designation indicates the year oforiginal adoption or, in the
2、 case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 ca
3、rbons 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 forin
4、formation 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.
5、2. Referenced Documents2.1 ASTM Standards:2D 2652 Terminology Relating to Activated CarbonE11 Specification for Wire Cloth and Sieves for TestingPurposesE 177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE 300 Practice for Sampling Industrial ChemicalsE 691 Practice for Conduc
6、ting an Interlaboratory Study toDetermine the Precision of a Test Method3. Terminology3.1 DefinitionsTerms relating to this test method aredefined in Terminology D 2652.4. Summary of Test Method4.1 A weighed sample of as-received powdered activatedcarbon is placed in a test sieve that is inserted in
7、 the sieveholder 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 tes
8、t sieve 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 filtra
9、tion rates 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
10、test. 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), 2
11、00 and 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 an
12、d physi-cally homogeneous material. To enable performing meaningfultests within the stated tolerances of the ASTM test methods, it1This test method is under the jurisdiction of ASTM Committee D28 onActivated Carbon and is the direct responsibility of Subcommittee D28.02 on LiquidPhase Evaluation.Cur
13、rent edition approved Oct. 1, 2005. Published October 2005. Originallyapproved in 1991. Last previous edition approved in 1998 as D 5158 98.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volum
14、e information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.is essential that sampling be performed to obtain as represen-tative a sample as possible. When a small am
15、ount of samplerepresents tons of material, the collection, mixing, and prepa-ration of samples is extremely important. The practice de-scribed in Practice E 300 is suitable to ensure that samplingand sample preparation of activated carbon is appropriate forthe performance of this test method. In abs
16、ence of followingPractice E 300, 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,consideration must be
17、 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 E 300 or a mutuallyagreed upon sampling and
18、sample preparation procedure, to thenearest 10 mg and record.NOTE 2A 10 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 the weighed sample i
19、nto 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.8.6 When the air-jet s
20、ieve 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 material was adhering t
21、o 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 asfollows:P, % passing 5S 2
22、R!S3 100whereP = 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 activated car-bon,10.1.3 Name of t
23、he 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 sieve designa-tion),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. Precision and Bias
24、11.1 Precision:11.1.1 Interlaboratory Test ProgramAn 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 each activated c
25、arbon type overthree days. Practice E 691 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 the indicated s
26、ieve) 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 carbon3Manual on Test S
27、ieving 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 0.9 0.06 0.249
28、5 % 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 E 177. The respective standard deviations among the results may beobtained by dividing the above limit values by 2.8.D 5158 98 (2005)2ASTM
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32、 Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 5158 98 (2005)3
