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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 6043-2.9:2000 ISO 1298
2、4:2000 ICS 71.100.10; 75.160.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Methods of sampling and test for carbonaceous materials used in aluminium manufacture Part 2.9: Electrode coke Determination of particle size distribution Licensed Copy: sheffieldun sheffieldun, na
3、, Wed Dec 06 14:47:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 October 2000 BSI 10-2000 ISBN
4、 0 580 36382 1 BS 6043-2.9:2000 Amendments issued since publication Amd. No.DateComments National foreword This British Standard reproduces verbatim ISO 12984:2000 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee CII/24, Raw
5、materials for the aluminium industry, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and
6、 European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Standards Ca
7、talogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their co
8、rrect application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 4, an inside back cover and a back cover. The BSI copyright n
9、otice displayed in this document indicates when the document was last issued. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTERNATIONAL STANDARD ISO 12984 First edition 2000-07-01 Reference number ISO 12984:2000(E) Carbonaceous materials
10、 used in the production of aluminium Calcined coke Determination of particle size distribution Produits carbons utiliss pour la production de laluminium Coke calcin Dtermination de la granulomtrie BS 6043-2.9:2000 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:37 GMT+00:00 2006, Uncont
11、rolled Copy, (c) BSI ii? BS 6043-2.9:2000 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ?iii Contents?Page 1? Scope .?1 2? Normative references .?1 3? Principle ?1 4? Apparatus .?1 5? Sampling and preparation of test portion .?2 6? Procedu
12、re .?2 7? Expression of results ?3 8? Precision .?3 9? Test report ?4 BS 6043-2.9:2000 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv? Foreword ISO (the International Organization for Standardization) is a worldwide federation of nationa
13、l standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical com- mittees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. Internati
14、onal organizations, governmental and non-governmental, in liai- son with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the r
15、ules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the p
16、ossibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 12984 was prepared by Technical Committee ISO/TC 47,Chemistry, Subcommittee SC 7,Alumin
17、ium oxide, cryolite, aluminium fluoride, sodium fluoride, carbonaceous products for the aluminium in- dustry. BS 6043-2.9:2000 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ?1 Carbonaceous materials used in the production of aluminium Calc
18、ined coke Determination of particle size distribution 1Scope This International Standard specifies a method for the determination of the particle size distribution of a sample of coke having a typical size distribution as normally produced by calcination of delayed petroleum coke. The same pro- cedu
19、re can be applied to consignments of calcined anthracite. This International Standard cannot be applied to frac- tions of carbon material prepared by sieving and crushing or to filter fines. This method is applicable to the determination of particle sizes ranging from?to?, as the sum of the percenta
20、ges of the size distribution above and below this range is typically less than?. This International Standard is not applicable to determining particle sizes below?where a specific test for dust should be used. 2Normative references The following normative documents contain provisions which, through
21、reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publica- tions do not apply. However, parties to agreements based on this International Standard are encouraged to investi- gate the possibility
22、 of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain reg- isters of currently valid International Standards. ISO 565,Test sieves Metal wire cloth, pe
23、rforated metal plate and electroformed sheet Nominal sizes of open- ings. ISO 1953,Hard coal Size analysis by sieving. ISO 2325,Coke Size analysis (Nominal top size 20 mm or less). ISO 2591-1,Test sieving Part 1: Methods using test sieves of woven wire cloth and perforated metal plate. ISO 3310-1,Te
24、st sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth. ISO 3310-2,Test sieves Technical requirements and testing Part 2: Test sieves of perforated metal plate. ISO 6375:1980,Carbonaceous materials for the production of aluminium Coke for electrodes Sampling. 3Principle
25、 A sample of coke is subjected to a process of particle size analysis by dry sieve testing. The results are expressed in terms of the measured percentage by mass of the coke remaining on sieves of different sized openings between and?, or alternatively in terms of calculated cumulative percentages f
26、or the different sized openings. 4Apparatus 4.1Wire cloth test sieves, of the following opening sizes:?,?,?,?,?,?and . 0,25 mm 16 mm 10 % 0,25 mm 16 mm 0,25 mm 16 mm 8 mm 4 mm 2 mm 1 mm 0,5 mm 0,25 mm BS 6043-2.9:2000 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:37 GMT+00:00 2006, Un
27、controlled Copy, (c) BSI 2? The diameter of the sieves shall not be less than?and preferably?. The height shall be a minimum of . The sieves shall comply with ISO 565, ISO 3310-1 and ISO 3310-2. All specified sieves shall be used to prevent any one sieve overloading. 4.2Batch-type sieve shaker, whic
28、h oscillates the particles in short time periods with minimal particle breakage. Shaking by hand is not appropriate. 4.3Balances, capable of weighing the mass of one sieve plus the mass of the sample, such that the sample weighing error is less than?. 4.4Drying oven, for temperatures up to at least?
29、, and drying dishes, made from stainless steel or alumin- ium or another suitable material. 5Sampling and preparation of test portion 5.1Take a representative sample of the coke load in accordance with ISO 6375. NOTE 1The sample is normally split between the supplier and the customer and?of the mate
30、rial is used for the size analysis in each laboratory (see 7.2 in ISO 6375:1980). NOTE 2Care should be taken to ensure that the particle sizes are not altered during sampling and sample preparation including drying. 5.2Take a test portion from the representative sample in accordance with the quantit
31、ies in Table 1. NOTEThe test portion size is a function of sieve size to avoid overloading the sieves. Take the amount shown in Table 1 from the representative sample (see 5.1) using one of the methods of sample di- vision described in ISO 6375. 6Procedure Dry the test portion at a temperature of?fo
32、r?or until consecutive weighings at?intervals show less than?loss in mass. Determine the mass by weighing the test portion to an accuracy of?. Inspect the sieves and if blinding of the apertures is observed clean them with a stiff bristle or soft metal sieve brush. Assemble the sieves in a nest in d
33、escending order of size and fit to the receiver. Transfer the test portion to the top sieve, fit the lid and shake the nest of sieves for?. Take care to retain the particles within the sieve. Weigh each sieve with its oversize material and repeat the sieving process for a further?and weigh each siev
34、e with its oversize material again. If the mass of each sieve with its oversize material differs by less than?from the first weighing the sieving is complete. Otherwise repeat the operation until this is the case. Record the mass of sample retained on each size starting with the sieve of largest ape
35、rture. Check for overloading the sieves according to Table 2. If the maximum al- lowable mass on one sieve is exceeded repeat the procedure using screens with larger diameter or repeat the siev- ing with a smaller test portion. Table 1 Relationship between sieve size and test portion size Sieve diam
36、eter?Test portion mm?g 200?500?100 300?1 000?200 400?2 000?400 200 mm 400 mm 30 mm 0,1 % 120 C 4 kg 110 C 5 C 2 h 5 min 1 % 0,1 % 10 min 5 min 1 % BS 6043-2.9:2000 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ?3 7Expression of results Cal
37、culate and record the apparent loss in mass of the test portion, i.e. the difference between the total mass of the test portion before and after sieving. If the loss in mass is less then?of the original mass of the test portion add it to the mass of the smallest size fraction. If the loss is greater
38、 than?of the original mass of the test portion, reject the results of the size analysis test. NOTELoss of mass means loss of test portion, which should not occur. Convert the mass retained on each sieve to a percentage of the total mass of the test portion. Calculate the cumula- tive percentage as s
39、hown in Table 3, rounding the results to the nearest?mass fraction. 8Precision 8.1Repeatability The repeatability of the results obtained for the different individual fraction size is?relative. For the cumulative percentage between?to?, the repeatability is?absolute and, outside this range,?. Table
40、2 Maximum allowable fractional mass on screens Nominal width of opening of screen Maximum allowable mass at end of sieving mm?g 16?100?400 8?100?400 4?250?1 000 2?250?1 000 1?150?600 0,5?120?500 0,25?100?400 Table 3 Example of the calculation of the cumulative percentage Fraction size Distribution p
41、ercentage Size Cumulative percentage mm?%?mm?% 16?0,0?16?0,0 16 to 8?9,5?8?9,5 8 to 4?22,4?4?31,9 4 to 2?17,8?2?49,7 2 to 1?16,3?1?66,0 1 to 0,5 ?15,3 ?0,5 ?81,3 0,5 to 0,25 ?10,9 ?0,25 ?92,2 0,25?8,0?0,25?100,2 200 mm 400 mm 1 % 1 % 0,1 % 10 % 20 % 80 % 3 % 2 % BS 6043-2.9:2000 Licensed Copy: sheff
42、ieldun sheffieldun, na, Wed Dec 06 14:47:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4? 8.2Reproducibility No reproducibility is quoted for determinations carried out in different laboratories because the transport of a coke sample involves the risk of breakage and thus alteration of the size dist
43、ribution. Specifications for “as dispatched” and “as received” materials, respectively measured by the producer and by the user, shall be mutually agreed. 9Test report The test report shall include the following information: a)all details necessary for identification of the product tested; b)a refer
44、ence to this International Standard, i.e. ISO 12984:2000; c)the results and the units in which they are expressed; d)any operation not included in this International Standard or in any of the International Standards to which reference is made, as well as any operations regarded as optional; e)the da
45、te on which the test was carried out. BS 6043-2.9:2000 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:47:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6043-2.9:2000 ISO 12984:2000
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