BS ISO 579-2013 Coke Determination of total moisture《焦炭 总水分的测定》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 579:2013Coke Determination of totalmoistureBS ISO 579:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 579:2013. Itsupersedes BS

2、 1016-102:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PTI/16, Solid mineral fuels.A list of organizations represented on this committee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 does not purport to include all the necessarypro

3、visions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 80380 2ICS 75.160.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was publishe

4、d under the authority of theStandards Policy and Strategy Committee on 31 May 2013.Amendments issued since publicationDate Text affectedBS ISO 579:2013 ISO 2013Coke Determination of total moistureCoke Dtermination de lhumidit totaleINTERNATIONAL STANDARDISO579Fourth edition2013-05-01Reference number

5、ISO 579:2013(E)BS ISO 579:2013ISO 579:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photo

6、copying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E

7、-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 579:2013ISO 579:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Principle 14 Apparatus . 15 Sample . 16 Procedure. 17 Expression of results 27.1 Sample as analysed (see Clause 6)

8、. 27.2 Visibly wet sample (see Clause 5) 28 Precision . 28.1 Repeatability limit 28.2 Reproducibility limit 39 Test report . 3BS ISO 579:2013ISO 579:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The

9、 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-gove

10、rnmental, 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

11、 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 vote.

12、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 579 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee SC 5, Methods

13、 of analysis.This fourth edition cancels and replaces the third edition (ISO 579:1999), which has been technically revised.iv ISO 2013 All rights reservedBS ISO 579:2013INTERNATIONAL STANDARD ISO 579:2013(E)Coke Determination of total moisture1 ScopeThis International Standard specifies a method for

14、 determining the total moisture of coke. It can be used for the determination of moisture of blast-furnace coke, foundry coke and other high-temperature carbonization products.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated r

15、eferences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 13909-6, Hard coal and coke Mechanical sampling Part 6: Coke Preparation of test samples3 PrincipleA sample is heated in air at 120 C to 200 C and m

16、aintained at this temperature until constant in mass. The moisture percentage is calculated from the loss in mass of the sample. Coke is not liable to oxidation under the specified conditions.4 Apparatus4.1 Drying oven, capable of maintaining a substantially uniform temperature zone at 120 C to 200

17、C and in which the rate of atmospheric change is sufficiently rapid for the test.4.2 Tray, approximately 0,1 m2in area and 25 mm deep, made of non-corrodible material such as stainless steel, tinned steel or aluminium.4.3 Balance, capable of weighing to the nearest 1 g.5 SampleThe sample for the det

18、ermination of total moisture, taken in accordance with ISO 13909-6 shall be kept in a sealed, airtight container. The whole of the sample is crushed to a nominal top size of 16 mm using a jaw crusher. From the crushed material, the laboratory sample is obtained by dividing.It is essential that preca

19、utions be taken to prevent change of moisture during these operations, by undue ventilation, contact with wet surfaces, etc. or loss of sample as dust.Samples which are visibly wet, and those for which the moisture is expected to exceed 15 %, are partially dried (air-dried) before reduction and divi

20、sion. This air-drying procedure is described in ISO 13909-6 and the resulting air-dry loss is calculated to the nearest 0,1 % (X). The air drying of visibly wet samples shall be carried out in the laboratory in which the determination of the moisture remaining after air-drying (M) is carried out.6 P

21、rocedureWeigh the clean, dry, empty tray (4.2) to the nearest 1 g (m1). Add about 1 000 g 100 g of the laboratory sample, spread the coke evenly and reweigh to the nearest 1 g (m2). Place the charged tray in the ISO 2013 All rights reserved 1BS ISO 579:2013ISO 579:2013(E)oven (4.1) at a temperature

22、of 120 C to 200 C. After the drying period is complete, remove the tray with the dried sample from the oven. Immediately reweigh the tray plus dried sample to the nearest 1 g (m3) to avoid absorption of moisture during cooling.If there is any doubt that drying is not complete, reheat at 120 C to 200

23、 C for further periods of heating until any change in mass does not exceed 0,1 % mass fraction.For a particular oven, the times required to ensure constancy in mass shall be verified by experiments.NOTE If appropriate, the drying can be done at a lower temperature, e.g. 105 C to 110 C as for hard co

24、al.7 Expression of results7.1 Sample as analysed (see Clause 6)The total moisture, MT, of the coke as analysed, expressed as mass fraction in percent, is given by Equation (1):MmmmmT=2321100 (1)wherem1is the mass, in grams, of the empty tray;m2is the mass, in grams, of the tray plus coke before heat

25、ing;m3is the mass, in grams, of the tray plus coke after heating.Report the result, as the mean of duplicate determinations, to the nearest 0,1 % mass fraction.7.2 Visibly wet sample (see Clause 5)For visibly wet samples, the total moisture MT, expressed as a percentage by mass, is given by Equation

26、 (2):MXMXT=+ 1100(2)whereX is the air-drying loss, as mass fraction in percent, of the original sample;M is the residual moisture, as mass fraction in percent, determined on the air-dried laboratory sample.8 Precision8.1 Repeatability limitThe results of duplicate determinations (carried out over a

27、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, shall not differ by more than the value shown in Table 1.2 ISO 2013 All rights reservedBS ISO 579:2013ISO 579:2013(E

28、)8.2 Reproducibility limitThe means of the results of duplicate determinations performed in each of two laboratories, on representative portions, taken from the same sample after dividing and crushing, shall not differ by more than the value shown in Table 1.Table 1 Precision of total moistureMaximu

29、m acceptable differences between resultsRepeatability limit Reproducibility limit0,5 % mass fraction absolute 0,7 % mass fraction absolute9 Test reportThe test report shall include the following information:a) a reference to this International Standard including year of publication;b) the identifica

30、tion of the sample;c) the results of the determination. ISO 2013 All rights reserved 3BS ISO 579:2013ISO 579:2013(E) ISO 2013 All rights reservedICS 75.160.10Price based on 3 pagesThis page deliberately left blankBSI is the independent national body responsible for preparing British Standards and ot

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