1、BRITISH STANDARD BS ISO 8005:2005 Carbonaceous materials used in the production of aluminium Green and calcined coke Determination of ash content ICS 71.100.10 BS ISO 8005:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 12 January 2006 B
2、SI 12 January 2006 ISBN 0 580 46560 8 National foreword This British Standard reproduces verbatim ISO 8005:2005 and implements it as the UK national standard. It supersedes BS 6043-2-2:1985 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee CII/24, Raw m
3、aterials for aluminium, which has the responsibility to: 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
4、 under the 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
5、 application. Compliance with a British Standard does not of itself confer immunity from legal obligations. 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;
6、monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 3 and a back cover. The BSI copyright notice displayed in this document indicates when
7、the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 8005:2005(E)INTERNATIONAL STANDARD ISO 8005 Second edition 2005-10-01 Carbonaceous materials used in the production of aluminium Green and calcined coke Determination of ash content Produits
8、 carbons utiliss pour la production de laluminium Coke cru et coke calcin Dtermination du taux de cendres BS ISO 8005:2005ii BS ISO 8005:2005 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of
9、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 the right to be represented on that committee. International organizations, governmental and non-governmental,
10、 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main t
11、ask of technical committees is to prepare International Standards. 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. Attent
12、ion 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 rights. ISO 8005 was prepared by Technical Committee ISO/TC 226, Materials for the production of primary aluminium.
13、 This second edition cancels and replaces the first edition (ISO 8005:1984), which has been technically revised. BS ISO 8005:2005 iv Introduction The content of ash or inorganic materials in coke is an important property, as ash will accumulate in the electrolyte when the coke is used for anodes. Co
14、nstant ash content may also be an indication that the same raw materials are used. 1 Carbonaceous materials used in the production of aluminium Green and calcined coke Determination of ash content 1 Scope This International Standard specifies a method for the determination of ash in green and calcin
15、ed coke used in the production of aluminium. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any am
16、endments) applies. ISO 6375, Carbonaceous materials for the production of aluminium Cokes for electrodes Sampling ASTM Practice E69199, Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method 3 Principle Heating of a test portion of a dry, finely ground
17、sample in a tared dish in a furnace at 700 C, to constant mass. 4 Apparatus 4.1 Jaw crusher, or another suitable crusher, faced with a very hard alloy that will not be abraded and therefore will not contaminate the sample. 4.2 Pestle and mortar, or a suitable mill, of hard material that will not be
18、abraded and therefore will not contaminate the sample. Suitable materials are agate, tungsten or silicon carbide. Porcelain should not be used. 4.3 Sieve, 750 m. 4.4 Laboratory balance. 4.5 Desiccator, containing a drying agent (e.g. activated alumina or molecular sieves). 4.6 Platinum dish, of capa
19、city 50 ml to 60 ml, diameter about 65 mm to 72 mm, height about 15 mm; or an appropriate porcelain dish. 4.7 Oven, capable of maintaining a temperature of (105 5) C. 4.8 Electric furnace, capable of being controlled at (700 10) C, with an adequate air circulation. BS ISO 8005:20052 5 Sampling and s
20、ample Sample in accordance with ISO 6375. 6 Procedure 6.1 Preparation of the test sample Use any suitable means to crush a representative portion of the material (Clause 5) to approximately 25 mm or smaller size and dry until it is totally dry e.g. at (105 5) C for 3 h. Further crush the dry materia
21、l, by means of the crusher (4.1), to approximately 6 mm or smaller size. Thoroughly mix the dried crushed material; reduce it by quartering to a test sample of at least 50 g. Grind the entire 50 g test sample with the pestle and mortar or in a mill (4.2) to such a fineness that it all passes through
22、 the 750 m sieve (4.3). 6.2 Test portion 6.2.1 Heat the platinum or porcelain dish (4.6) for 1 h in the furnace (4.8), controlled at (700 10) C, allow it to cool to ambient temperature in the desiccator containing the drying agent (4.5) and weigh to the nearest 0,000 2 g. 6.2.2 Weigh, to the nearest
23、 0,000 2 g, a test portion of about 20 g of the dry, sieved test sample (6.1), or a quantity sufficient to provide a minimum of 0,020 g of ash, in the previously tared dish (6.2.1). 6.3 Determination 6.3.1 Place the dish containing the test portion (6.2.2) into the cold furnace (4.8) and raise the t
24、emperature of the furnace to (700 10) C. Gradually heat to redness at such a rate as to avoid mechanical loss (in the case of green coke, this prevents a too rapid expulsion of volatile matter). Maintain at (700 10) C overnight, or for an adequate time to completely burn off the carbonaceous matter
25、in the test portion. Remove the dish containing the ash from the furnace and cool it to room temperature in the desiccator containing the drying agent (4.5). 6.3.2 Weigh the dish and ash as rapidly as possible; replace them in the furnace and repeat heating, cooling and weighing until the mass of th
26、e dish and contents does not differ by more than 0,000 5 g for two consecutive weighings. 7 Expression of results 7.1 Method of calculation The ash content, expressed as a percentage by mass, w a , is given by the formula: () 21 0 100 a wmm m = where m 0is the mass, in grams, of the test portion (6.
27、2.2); m 1is the mass, in grams, of the empty dish (6.2.1); m 2is the mass, in grams, of the dish containing the ash (6.3.2). BS ISO 8005:20053 Report the result in weight percent to the nearest 0,01 %. 7.2 Precision 7.2.1 Laboratories, materials and determinations The number of laboratories, materia
28、ls, and determinations met the minimum requirements for determining precision specified in ASTM Practice E691 (see Table 1): Table 1 Laboratories, materials and determinations This study ASTM E691 Minimum Laboratories 8 6 Materials 6 4 Determinations: 4 2 7.2.2 Precision statement for test method Re
29、peatability r = 0,03 % (weight percent) Reproducibility R = 0,06 % (weight percent) 8 Test report The test report shall include the following information: a) an identification of the sample; b) a reference to this International Standard; c) the results and the method of expression used; d) any unusu
30、al features noted during the determination; e) any operation not included in this International Standard or in the International Standards to which reference is made, or regarded as optional; f) date of the test. BS ISO 8005:2005BS ISO 8005:2005 BSI 389 Chiswick High Road London W4 4AL BSI British S
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