BS-ISO-20203-2005.pdf
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1、BRITISH STANDARD BS ISO 20203:2005 Carbonaceous materials used in the production of aluminium Calcined of crystallite size of calcined petroleum coke by X-ray diffraction ICS 77.120.10 ? coke Determination BS ISO 20203:2005 This British Standard was published under the authority of the Standards Pol
2、icy and Strategy Committee on 12 January 2006 BSI 12 January 2006 ISBN 0 580 47126 8 National foreword This British Standard reproduces verbatim ISO 20203:2005 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee CII/24, Raw mate
3、rials 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 UK interests informed; monitor related international and Europea
4、n 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 Catalogue under the
5、section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applicatio
6、n. 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 7 and a back cover. The BSI copyright notice displayed in this document indic
7、ates when the document was last issued. Amendments issued since publication Amd. No. DateComments Reference number ISO 20203:2005(E) INTERNATIONAL STANDARD ISO 20203 First edition 2005-10-01 Carbonaceous materials used in the production of aluminium Calcined coke Determination of crystallite size of
8、 calcined petroleum coke by X-ray diffraction Produits carbons utiliss pour la production de laluminium Coke calcin Dtermination de la taille de la cristallite du coke calcin de ptrole par diffraction aux rayons X BS ISO 20203:2005 ii BS ISO 20203:2005 iii Foreword ISO (the International Organizatio
9、n for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has
10、 the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Inter
11、national Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publicat
12、ion as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent righ
13、ts. ISO 20203 was prepared by Technical Committee ISO/TC 226, Materials for the production of primary aluminium. BS ISO 20203:2005 iv Introduction This International Standard is based on ASTM D5187-91(2002)6 published by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1
14、9428-2959, United States. ASTM D5187-91(2002) was developed under the jurisdiction of ASTM Committee D02 on Petroleum Products and Lubricants as the direct responsibility of Subcommittee D02.05.0D on Petroleum Coke Sampling and Procedures, and was published in December 1991. The crystallinity of pet
15、roleum coke, as reflected by the Lc value, is a general measure of quality affecting suitability for end use and is a function of the heat treatment used. The crystallite height is used to determine the extent of such heat treatment, for example, during calcination. The value of the Lc determined is
16、 not affected by coke microporosity or the presence of foreign, non- crystalline materials such as dedust oil. 1 Carbonaceous materials used in the production of aluminium Calcined coke Determination of crystallite size of calcined petroleum coke by X-ray diffraction SAFETY PRECAUTIONS This Internat
17、ional 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1 Scope This Inte
18、rnational Standard describes a test method for the determination of the mean crystallite height of a representative, pulverized sample of calcined petroleum coke by interpretation of an X-ray diffraction pattern produced through conventional X-ray scanning techniques. It applies to carbonaceous mate
19、rials used in the production of aluminium. Calcined petroleum coke contains crystallites of different heights. This test method covers the determination of the average height of all crystallites in the sample by empirical interpretation of the X-ray diffraction pattern. The crystallite diameter (La)
20、 is not determined by this test method. 2 Terms and definitions For the purposes of this document, the following terms, abbreviated terms and definitions apply. 2.1 crystallites stacks of graphitic carbon platelets located parallel to one another 2.2 LC mean or average height of crystallites in a sa
21、mple NOTE It is expressed as a linear dimension, in nanometres. 2.3 hkl(002) Miller indices of the crystalline planes of graphite corresponding to a lattice spacing (d) of 0,335 nm 2.4 glancing angle produced when a parallel beam of uniform X-rays impinges upon a crystalline lattice and measured by
22、the X-ray goniometer NOTE It is usually expressed in 2 . BS ISO 20203:2005 2 3 Principle A packed sample pulverized to less than 75 m is subjected to a monochromatic X-ray beam and rotated to produce a diffraction pattern under specific conditions. The location and shape of the peak with hkl (002) a
23、t d = 0,335 nm is used to calculate Lc by manual interpretation of the peak or by computer simulation. 4 Apparatus 4.1 X-ray powder diffractometer, equipped with an X-ray source set for Cu-K radiation, a monochromator or filter for restricting the wavelength range, a sample holder, a radiation detec
24、tor, a signal processor, and readout (chart or computer memory). The diffractometer shall be capable of rate scanning at 1/min or incrementally step scanning at 0,2/step. 4.2 Sample holders, as specified by the manufacturer of the diffractometer, that enable packing of a pulverized sample of suffici
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