1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 687:2010Solid mineral fuels Coke Determination of moisturein the general analysis testsampleBS ISO 687:2010 BRITISH STANDARDNational forewordThis British Standard is the U
2、K implementation of ISO 687:2010. Itsupersedes BS ISO 687:2004 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PTI/16, Solid mineral fuels.A list of organizations represented on this committee can beobtained on request to its secretary.This publication
3、does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 70437 6ICS 75.160.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority
4、of theStandards Policy and Strategy Committee on 30 November 2010.Amendments issued since publicationDate Text affectedBS ISO 687:2010Reference numberISO 687:2010(E)ISO 2010INTERNATIONAL STANDARD ISO687Third edition2010-06-15Solid mineral fuels Coke Determination of moisture in the general analysis
5、test sample Combustibles mineraux solides Coke Dtermination de lhumidit de lchantillon pour analyse BS ISO 687:2010ISO 687:2010(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unles
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10、so.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedBS ISO 687:2010ISO 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 Preparation of the test sample.2 7 Proc
11、edure.2 8 Expression of results2 9 Precision.3 10 Test report3 BS ISO 687:2010ISO 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). The work of preparing Internation
12、al 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, in liaison with ISO,
13、 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 task of technical comm
14、ittees 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. Attention is drawn to the p
15、ossibility 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, Methods of analysis. This third e
16、dition cancels and replaces the second edition (ISO 687:2004), of which it constitutes a minor revision. BS ISO 687:2010ISO 687:2010(E) ISO 2010 All rights reserved vIntroduction The determination of the moisture in the general analysis test sample is required to correct the results of certain analy
17、tical 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 is required, therefore, that the mo
18、isture 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 suffices to correct these analyses. BS
19、 ISO 687:2010BS ISO 687:2010INTERNATIONAL 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 moisture in the general analysis test sam
20、ple 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. For dated references, only the editio
21、n 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 International Standard, the definition
22、s 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 oxidation under the conditions stated
23、. 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-resistant metal, with a well fitting cov
24、er, of such a size that the coke layer does not exceed 0,20 g/cm2. 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 nitrogen through it during the cooling perio
25、d. BS ISO 687:2010ISO 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 equilibrium with the laboratory atmosphe
26、re, 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, dry, empty weighing dish with its cover
27、 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 immediately. If the size of the oven allows, rep
28、lace 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 is reached, reweigh to the nearest 0,1
29、 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 between successive weighings does not e
30、xceed 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 temperature of 320 C in a nitrogen atmos
31、phere, 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 required to ensure constancy in mass. 8 Expr
32、ession of results The moisture in the coke as analysed, H2O,ad, expressed as a percentage mass fraction is given by Equation (1): 223HO,ad21100mmmm=(1) where m1is the mass, expressed in grams, of the empty dish plus cover; m2is the mass, expressed in grams, of the dish plus cover plus coke before he
33、ating; m3is 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 687:2010ISO 687:2010(E) ISO 2010 All rights reserved 39 Precision 9.1 Repeatability limit The results of du
34、plicate 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 by more than the values shown in Table 1. 9.2 Reproduci
35、bility 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 Repeatability limit Reproducibility limit 0,2 % absolute See 9.2 10
36、 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 687:2010ISO 687:2010(E) ICS 75.160.10 Price based on 3 pages
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