1、Reference numberISO/TS 14425:1999(E)ISO 1999TECHNICALSPECIFICATIONISO/TS14425First edition1999-10-01Carbonaceous materials used in theproduction of aluminium Cold-rammingpastes Determination of volatile-mattercontent of unbaked pastesProduits carbons utiliss pour la production de laluminium Ptes deb
2、rasquage froid Dtermination de la teneur en matires volatiles desptes cruesCopyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO/TS 14425:1999(E)PDF disclaimerThis PDF file
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7、ficeCase postale 56 Gb7 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 734 10 79E-mail copyrightiso.chWeb www.iso.chPrinted in Switzerlandii ISO 1999 All rights reservedCopyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or
8、 networking permitted without license from IHS-,-,-ISO/TS 14425:1999(E) ISO 1999 All rights reserved iiiContents PageForeword.iv1 Scope12 Normative reference13 Principle14 Apparatus.15 Sampling.16 Preparation of test portions27 Procedure.28 Calculation and expression of results.29 Precision.29.1 Rep
9、eatability.29.2 Reproducibility.210 Test report3Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO/TS 14425:1999(E)iv ISO 1999 All rights reservedForewordISO (the Intern
10、ational Organization for Standardization) is a worldwide federation of national standards bodies (ISOmember bodies). The work of preparing International Standards is normally carried out through ISO technicalcommittees. Each member body interested in a subject for which a technical committee has bee
11、n established hasthe right to be represented on that committee. International organizations, governmental and non-governmental, inliaison with ISO, also take part in the work. ISO collaborates closely with the International ElectrotechnicalCommission (IEC) on all matters of electrotechnical standard
12、ization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.The main task of technical committees is to prepare International Standards. Draft International Standards adoptedby the technical committees are circulated to the member bodies for votin
13、g. Publication as an InternationalStandard requires approval by at least 75 % of the member bodies casting a vote.In other circumstances, particularly when there is an urgent market requirement for such documents, a technicalcommittee may decide to publish other types of normative document:Gbe an IS
14、O Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in anISO working group and is accepted for publication if it is approved by more than 50 % of the members of theparent committee casting a vote;Gbe an ISO Technical Specification (ISO/TS) represents an agr
15、eement between the members of a technicalcommittee and is accepted for publication if it is approved by 2/3 of the members of the committee casting avote.An ISO/PAS or ISO/TS is reviewed every three years with a view to deciding whether it can be transformed into anInternational Standard.Attention i
16、s drawn to the possibility that some of the elements of ISO/TS 14425 may be the subject of patent rights.ISO shall not be held responsible for identifying any or all such patent rights.ISO/TS 14425 was prepared by Technical Committee ISO/TC 47, Chemistry, Subcommittee SC 7, Aluminiumoxide, cryolite,
17、 aluminium fluoride, sodium fluoride, carbonaceous products for the aluminium industry.Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TECHNICAL SPECIFICATION ISO/TS 1442
18、5:1999(E) ISO 1999 All rights reserved 1Carbonaceous materials used in the production of aluminium Cold-ramming pastes Determination of volatile-matter contentof unbaked pastes1 ScopeThis Technical Specification describes a method for the determination of the volatile-matter content of unbakedcold-r
19、amming pastes used in aluminium manufacture.2 Normative referenceThe following normative document contains provisions which, through reference in this text, constitute provisions ofthis Technical Specification. For dated references, subsequent amendments to, or revisions of, this publication donot a
20、pply. However, parties to agreements based on this Technical Specification are encouraged to investigate thepossibility of applying the most recent edition of the normative document indicated below. For undated references,the latest edition of the normative document referred to applies. Members of I
21、SO and IEC maintain registers ofcurrently valid International Standards.ISO 14422:1999, Carbonaceous materials used in the production of aluminium Cold-ramming pastes Sampling.3PrincipleA test portion of the cold-ramming paste contained in a lidded crucible is heated for 15 min in a furnace at 925 C
22、and the loss in mass is measured. The result, expressed as a percentage of the test portion mass, is the volatile-matter content.4 ApparatusOrdinary laboratory apparatus and the following:4.1 Two silica crucibles, squat form, with lids, capacity approximately 50 ml, prepared for the determination by
23、being heated in the electric furnace (4.2) at 925 C Gb1 5 C for a minimum period of 30 min, then placed in adesiccator to cool to ambient temperature and stored in the desiccator until required for use.4.2 Electric furnace, capable of being maintained at 925 C Gb1 5 C and recovering the set temperat
24、ure within2 min of insertion of the crucibles (4.1) containing the test portions.5 SamplingPrepare a representative laboratory sample of cold-ramming paste in accordance with ISO 14422.Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo rep
25、roduction or networking permitted without license from IHS-,-,-ISO/TS 14425:1999(E)2 ISO 1999 All rights reserved6 Preparation of test portionsTake two test portions, each of 10 g Gb1 0,1 g, from the laboratory sample (see clause 5) in accordance with 6.5.3 ofISO 14422:1999.7 ProcedureWeigh a prepar
26、ed crucible and lid (4.1) to the nearest 0,001 g. Transfer one test portion (see clause 6) to thecrucible, replace the lid, then reweigh to the nearest 0,001 g.Weigh a second prepared crucible and lid, transfer the second test portion to it, replace the lid and reweigh to thenearest 0,001 g.Place th
27、e lidded crucibles with their contents in the electric furnace (4.2), maintained at 925 C Gb1 5C,for15min.Remove the lidded crucibles and contents from the furnace and place them in a desiccator to cool to ambienttemperature. Weigh the lidded crucibles and contents to the nearest 0,001 g.8 Calculati
28、on and expression of resultsCalculate the volatile-matter content V of each sample, as a percentage by mass, from the following equation:VMMMMG3dG2dG2d1002321bgwhereM1is the mass of the prepared crucible and lid, in grams;M2is the mass of the same prepared crucible and lid but containing the test po
29、rtion before heating, in grams;M3is the mass of the same crucible and lid containing the test portion after heating, in grams.Calculate the volatile-matter content of the cold-ramming paste as the arithmetic mean of the results of the twodeterminations calculated as above, expressed to one decimal p
30、lace.If the results of the two individual determinations differ by more than 0,5 % by mass, reject the results and repeatthe procedure given in clause 7 with fresh test portions.9 Precision9.1 RepeatabilityThe means of the results of duplicate determinations carried out in the same laboratory by the
31、 same operator withthe same apparatus but at different times on representative test portions taken from the same laboratory sampleshould not differ by more than 0,4 % absolute.9.2 ReproducibilityThe means of the results of duplicate determinations carried out in each of two laboratories on represent
32、ative testportions taken from the same laboratory sample in each laboratory should not differ by more than 0,9 % absolute.Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
33、ISO/TS 14425:1999(E) ISO 1999 All rights reserved 310 Test reportThe test report shall include the following information:a) all details necessary for complete identification of the test portion;b) a reference to this Technical Specification, i.e. ISO/TS 14425:1999;c) the result for the percentage co
34、ntent of volatile matter of the unbaked paste, calculated in accordance withclause 8 and expressed to one decimal place;d) any unusual features noted during the determination;e) any operation not included in this Technical Specification or regarded as optional.Copyright International Organization fo
35、r Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO/TS 14425:1999(E)ICS 71.100.10Price based on 3 pages ISO 1999 All rights reservedCopyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
