1、Designation: D 293 93 (Reapproved 2004)Standard Test Method for theSieve Analysis of Coke1This standard is issued under the fixed designation D 293; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numbe
2、r 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 describes the separation of a cokesample into defined size fractions and expressing said fractionsas a weight percent of t
3、he gross sample.1.2 The values stated in SI units are to be regarded as thestandard. Inch-pound units shall be accepted on an equivalentbasis.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
4、 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:2D 346 Practice for Collection and Preparation of CokeSamples for Laboratory AnalysisD 4621 Guide for Quality Management in an Orga
5、nizationthat Samples or Tests Coal and CokeE 11 Specification for Wire Cloth and Sieves for TestingPurposesE 323 Specification for Perforated-Plate Sieves for TestingPurposes3. Significance and Use3.1 This test method determines the size distribution of cokefor conformance to specifications of perce
6、ntages retained ondesignated screen sizes.4. Apparatus4.1 SievesUse square-hole sieves conforming to Specifi-cation E 11. Where sieves larger than 100 mm (4 in.) arerequired, the specifications for same shall be by mutualagreement between interested parties. Permissible variations insieve openings a
7、nd spacings shall be in accordance withSpecification E 11.4.1.1 For complete characterization of the size range of acoke sample, the number and size of the selected sieves shouldbe such that no more than 25 % of the gross sample weight willbe retained on any given sieve.4.1.2 For coke 38.1 mm (112 i
8、n.) and larger in size, sievesof heavy double-crimped wire and square or rectangular frameswith 0.56 to 0.84 m2(6 to 9 ft2) of sieve area are satisfactory.For coke smaller than 38.1 mm (112 in.) in size, sieves ofdouble-crimped wire and square or circular frames with 0.19 to0.37 m2(2 to 4 ft2) of si
9、eve area are usually more convenient.4.2 Weighing Balance, preferably of the platform type,having a sensitivity of 0.025 kg (0.05 lbs) or better, at ratedcapacity and with graduations such that 0.05 kg (0.1 lb) can beread without interpolation.5. Test Sample5.1 The test sample shall be taken in acco
10、rdance withPractice D 346.6. Procedure6.1 Starting with the sieve having the largest opening, sievethe sample of coke in quantities small enough to preventplugging and clogging of the sieve.6.1.1 Hand-fit each piece of coke retained on the 38.1-mm(112-in.) or larger sieve. A piece is considered unde
11、rsize, if insome position and without forcing, it passes the sieve opening.6.1.2 Shake vigorously on each succeeding sieve cokepieces passing the 38.1-mm (112-in.) sieve. This shaking maybe performed manually or mechanically provided mechanicalshaking yields results equivalent to manual shaking. Not
12、e thatthe objectives of shaking, either manual or mechanical, are toplace all of the naturally occurring pieces of a given size rangeon the appropriate sieve and to avoid degradation of thenaturally occurring sizes.6.2 Record to the nearest 0.05 kg (0.1 lb) the weight of cokeretained on each sieve a
13、nd that which passes the smallest sieveused. For routine testing, the sum of all the size-fractionweights may be taken as the total weight of coke tested.6.2.1 Samples containing pieces retained on 50-mm (2-in.)sieves and larger, need not be dried. However, when a higherdegree of accuracy is desired
14、, dry the gross sample to less than1 % moisture and accurately weigh before sieving. Dry allsamples of coke containing only pieces which pass a 50-mmsieve to less than 1 % moisture before testing.1This test method is under the jurisdiction of ASTM Committee D05 on Coaland Coke and is the direct resp
15、onsibility of Subcommittee D05.15 on MetalurgicalProperties of Coal and Coke.Current edition approved April 1, 2004. Published May 2004. Originallyapproved in 1928. Last previous edition approved in 1993 as D 293 93 (1999).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orconta
16、ct ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume 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.7. Report7.1 Report the
17、 weights of the size fractions as a percentageof the weight of the gross sample. Calculate percentage to thenearest 0.1 %. Record the results starting with the fraction oflargest sieve size, which may be shown for separate fractions orcumulatively.7.2 For those tests in which the gross sample is wei
18、ghedbefore sieving, the sum of the weights of all size fractionsshould equal the measured gross weight. In cases in which thecumulative weight of size fractions differs from the initial grossweight by 0.5 % or less of the gross weight, adjustment can bemade in the weight of the size fraction passing
19、 the smallestsieve size. With careful procedure, this difference should notexceed 0.5 %.8. Precision and Bias8.1 ReproducibilityNo precision statement has been de-veloped for this test method because of the impracticality ofobtaining, transporting, and handling representative splits ofthe materials
20、in the quantities that would be needed to establishthe precision statement.8.2 RepeatabilityThe precision of this test method isbeing investigated by a task group. At this time the values havenot been determined.8.3 BiasThe lack of a reference material precludes a biasstatement.9. Keywords9.1 breaka
21、ge; coke; degradation; incrementsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof
22、 infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this s
23、tandard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake you
24、r views known to the ASTM Committee on 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 293 93 (2004)2
