1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 687:2010 Solid mineral fuels Coke Determination of moisture in the general analysis test sampleBS ISO 687:2010 BRITISH STANDARD National foreword This British Standard
2、is the UK implementation of ISO 687:2010. It supersedes BS ISO 687:2004 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PTI/16, Solid mineral fuels. A list of organizations represented on this committee can be obtained on request to its secretary. Thi
3、s publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2010 ISBN 978 0 580 70437 6 ICS 75.160.10 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published
4、 under the authority of the Standards Policy and Strategy Committee on 30 November 2010. Amendments issued since publication Date Text affectedBS ISO 687:2010Reference number ISO 687:2010(E) ISO 2010INTERNATIONAL STANDARD ISO 687 Third edition 2010-06-15 Solid mineral fuels Coke Determination of moi
5、sture in the general analysis test sample Combustibles mineraux solides Coke Dtermination de lhumidit de lchantillon pour analyse BS ISO 687:2010 ISO 687:2010(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewe
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10、 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedBS ISO 687:2010 ISO 687:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Definitions 1 4 Principle1 5 Apparatus.1 6 Prepara
11、tion of the test sample.2 7 Procedure.2 8 Expression of results2 9 Precision.3 10 Test report3 BS ISO 687:2010 ISO 687:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies).
12、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 the right to be represented on that committee. International organizations, governmental and non-g
13、overnmental, 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
14、. 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. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a
15、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 rights. ISO 687 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee SC 5,
16、Methods of analysis. This third edition cancels and replaces the second edition (ISO 687:2004), of which it constitutes a minor revision. BS ISO 687:2010 ISO 687:2010(E) ISO 2010 All rights reserved vIntroduction The determination of the moisture in the general analysis test sample is required to co
17、rrect the results of certain analytical determinations, e.g. volatile matter and hydrogen, for the effect of water in the determination and to allow all determinations to be corrected to a dry basis. Since coke is hygroscopic, its moisture varies with a change in humidity of the atmosphere, and it i
18、s required, therefore, that the moisture in the general analysis test sample be determined whenever portions are weighed out for other analytical determinations. If test portions for several analytical determinations are weighed out at the same time, a single simultaneous moisture determination suff
19、ices to correct these analyses. BS ISO 687:2010BS ISO 687:2010 INTERNATIONAL STANDARD ISO 687:2010(E) ISO 2010 All rights reserved 1Solid mineral fuels Coke Determination of moisture in the general analysis test sample 1 Scope This International Standard specifies a method for determining the moistu
20、re in the general analysis test sample of coke. It can be used for the determination of moisture in blast-furnace coke, foundry-coke and other high-temperature carbonization products. 2 Normative references The following referenced documents are indispensable for the application of this document. Fo
21、r dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1213-2, Solid mineral fuels Vocabulary Part 2: Terms relating to sampling, testing and analysis 3 Definitions For the purposes of this Int
22、ernational Standard, the definitions given in ISO 1213-2 apply. 4 Principle A known mass of the coke is heated in air at 120 C to 200 C and maintained at this temperature until a constant mass is obtained. The moisture content is calculated from the loss in mass of the coke. Coke is not liable to ox
23、idation under the conditions stated. 5 Apparatus 5.1 Analytical balance, capable of weighing to the nearest 0,1 mg. 5.2 Oven, capable of being controlled at a temperature of 120 C to 200 C and with a means to allow a flow of air or nitrogen. 5.3 Weighing dish, shallow, of glass or of corrosion-resis
24、tant metal, with a well fitting cover, of such a size that the coke layer does not exceed 0,20 g/cm 2 . 5.4 Cooling vessel, e.g. desiccator, without desiccant, containing a porcelain or a metal plate, preferably of aluminium or copper. The vessel may be provided with the means to pass air or nitroge
25、n through it during the cooling period. BS ISO 687:2010 ISO 687:2010(E) 2 ISO 2010 All rights reserved6 Preparation of the test sample The coke used for the determination of moisture content is the general analysis test sample (see ISO 1213-2). Ensure that the moisture content of the sample is in eq
26、uilibrium with the laboratory atmosphere, exposing it, if necessary, in a thin layer for the minimum time required to achieve equilibrium. Before commencing the determination, thoroughly mix the equilibrated test sample for at least 1 min, preferably by mechanical means. 7 Procedure Weigh a clean, d
27、ry, empty weighing dish with its cover to the nearest 0,1 mg. Add 1 g 0,1 g of the coke sample in an even layer and reweigh. Heat the uncovered dish in the oven at 120 C to 200 C. When the drying period is complete, remove the dish with the dried sample from the oven and replace the cover immediatel
28、y. If the size of the oven allows, replace the cover while the dish is still in the oven. Allow the dish to cool on a thick metal plate for 10 min. At the end of the 10 min cooling period, transfer the dish to a cooling vessel (5.4) and allow to cool to room temperature. As soon as room temperature
29、is reached, reweigh to the nearest 0,1 mg. NOTE 1 If a cooling vessel with air or nitrogen flow is used the dish can be transferred directly without cooling on a metal plate. If there is any doubt that drying is complete, reheat at 120 C to 200 C for further 30 min periods until the change in mass b
30、etween successive weighings does not exceed 1 mg. For a particular oven, the times required to ensure constancy in mass shall be verified by experiments. NOTE 2 Heating for 4 h is normally sufficient. The time taken for the determination can be considerably shortened if drying is carried out at a te
31、mperature of 320 C in a nitrogen atmosphere, when heating for 1 h usually suffices. For this procedure, a minimum free space oven may be used. If appropriate, the drying can be done at lower temperature, e.g. 105 C to 110 C, as for hard coal. It is necessary to verify by experiments the times requir
32、ed to ensure constancy in mass. 8 Expression of results The moisture in the coke as analysed, H 2 O,ad , expressed as a percentage mass fraction is given by Equation (1): 2 23 HO , a d 21 100 mm mm = (1) where m 1is the mass, expressed in grams, of the empty dish plus cover; m 2is the mass, expresse
33、d in grams, of the dish plus cover plus coke before heating; m 3is the mass, expressed in grams, of the dish plus cover plus coke after heating. Report the result, as the mean of duplicate determinations, to the nearest 0,1 % mass fraction. BS ISO 687:2010 ISO 687:2010(E) ISO 2010 All rights reserve
34、d 39 Precision 9.1 Repeatability limit The results of duplicate determinations (carried out over a short period of time, but not simultaneously) in the same laboratory, by the same operator, with the same apparatus on two representative portions taken from the same analysis sample, should not differ
35、 by more than the values shown in Table 1. 9.2 Reproducibility limit Since the humidity conditions in different laboratories vary, it is not practical to quote a limiting value for reproducibility. Table 1 Precision of moisture determination Maximum acceptable differences between results Repeatabili
36、ty limit Reproducibility limit 0,2 % absolute See 9.2 10 Test report The test report shall include the following information: a) reference to this International Standard, i.e. ISO 687; b) identification of the sample tested; c) results of the determination; d) date of the determination. BS ISO 687:2
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