1、BSI Standards PublicationBS ISO 1953:2015Hard coal Size analysis bysievingBS ISO 1953:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 1953:2015. It supersedes BS 1016-109:1995 which is withdrawn.The UK participation in its preparation was entrusted to Tech
2、nicalCommittee 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 necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards
3、Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 82443 2ICS 73.040; 75.160.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2015
4、.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 1953:2015 ISO 2015Hard coal Size analysis by sievingHouille Analyse granulomtrique par tamisageINTERNATIONAL STANDARDISO1953Third edition2015-11-15Reference numberISO 1953:2015(E)BS ISO 1953:2015ISO 1953:2015(E)ii ISO
5、2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll 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 photocopying, or posting on the
6、 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 officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47
7、copyrightiso.orgwww.iso.orgBS ISO 1953:2015ISO 1953:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Apparatus . 14.1 For all methods . 14.2 For dry sieving . 24.3 For wet sieving 25 Sampling of test sample 25.1 General . 35.2 Drying . 35.3 Division (ot
8、her than wet coal of nominal top size less than 4 mm) 35.4 Division of wet coal of nominal top size less than 4 mm 46 Procedure. 46.1 General . 46.2 Dry sieving 46.2.1 Sample of maximum particle size greater than 22,4 mm . 46.2.2 Sample of maximum particle size between 4 mm and 22,4 mmmanual method
9、. 56.2.3 Sample of maximum particle size less than 4 mmmanual method 56.2.4 Sample of maximum particle size between 4 mm and 22,4 mm; minus 4 mmmechanical method . 66.3 Wet sieving . 67 Expression of results 77.1 Calculation 77.2 Graphical presentation . 78 Test report . 8Annex A (informative) Guide
10、 to sampling 12Annex B (informative) Example of removal by wet sieving of fine material from a sample having a maximum particle size less than 4 mm .13 ISO 2015 All rights reserved iiiContents PageBS ISO 1953:2015ISO 1953:2015(E)ForewordISO (the International Organization for Standardization) is a w
11、orldwide federation of national standards bodies (ISO member bodies). 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
12、on that committee. International organizations, governmental and non-governmental, 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.The procedures used to develop this
13、 document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Dir
14、ectives, Part 2 (see www.iso.org/directives).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. Details of any patent rights identified during the devel
15、opment of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO s
16、pecific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 27, Solid minera
17、l fuels, Subcommittee SC 1, Coal preparation: Terminology and performance.This third edition cancels and replaces the second edition (ISO 1953:1994), of which it constitutes a minor revision.iv ISO 2015 All rights reservedBS ISO 1953:2015ISO 1953:2015(E)IntroductionSize analysis involves the separat
18、ion of a sample of coal into size fractions having defined limits. In the methods described in this International Standard the results are expressed in terms of the percentage mass of coal remaining on sieves of different aperture sizes. This information can be of use in a number of applications, in
19、cluding the following: assessing the yields of products from run-of-mine coals; providing design data for coal preparation plants; checking that products from screening plants are within the required limits; assessing the performance of coal-crushing plants; and selecting coals for particular proces
20、ses and equipment. ISO 2015 All rights reserved vBS ISO 1953:2015BS ISO 1953:2015Hard coal Size analysis by sieving1 ScopeThis International Standard specifies reference methods for the size analysis of coal by manual sieving (wet or dry), using test sieves of aperture sizes between 125 mm and 45 m.
21、 A guide to sampling is given in Annex A.This International Standard is applicable to all hard coals. It is not applicable to coke or other manufactured fuels.In the case of pulverized coal which has been ground so that a high proportion passes through the test sieve of smallest aperture size, the m
22、ethods described in this International Standard will determine only the percentage oversize.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies.
23、 For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1213-1, Solid mineral fuels Vocabulary Part 1: Terms relating to coal preparationISO 1213-2, Solid mineral fuels Vocabulary Part 2: Terms relating to sampling, testing and analysisISO 13909
24、(all parts), Hard coal and coke Mechanical samplingISO 18283, Hard coal and coke Manual samplingISO 3310-1, Test sieves Technical requirements and testing Part 1: Test sieves of metal wire clothISO 3310-2, Test sieves Technical requirements and testing Part 2: Test sieves of perforated metal plate3
25、Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 1213-1 and ISO 1213-2 apply.4 Apparatus4.1 For all methods4.1.1 Test sieves, exclusively round-hole or exclusively square-hole, complying with ISO 3310-1 or ISO 3310-2, as appropriate.The recommended serie
26、s of test sieves for general purposes is 125 mm, 90 mm, 75 mm, 63 mm, 50 mm, 45 mm, 31,5 mm, 22,4 mm, 16 mm, 11,2 mm, 8 mm, 5,6 mm, 4 mm, 2 mm and 1 mm nominal aperture sizes, square-hole, or the same sizes of round-hole sieves. If this series is inadequate for the sizing of graded coals, sieves fro
27、m the supplementary sizes 100 mm, 80 mm, 40 mm, 25 mm, 20 mm, 12,5 mm, 10 mm and 6,3 mm may be included. For samples greater than 125 mm, single square-hole gauges of the required dimensions may be used for the larger pieces. Test sieves of nominal aperture size 4 mm and less should be of metal wire
28、 cloth; the recommended series of nominal aperture sizes is 4 mm, 2,8 mm, 2 mm, 1,4 mm, 1 mm, 710 m, 500 m, 355 m, 250 m, 180 m, 125 m, 90 m, 63 m and 45 m.INTERNATIONAL STANDARD ISO 1953:2015(E) ISO 2015 All rights reserved 1BS ISO 1953:2015ISO 1953:2015(E)When a complete size analysis is required,
29、 it is preferable, subject to the range of sieve aperture sizes available, that the mass of coal in any size fraction does not exceed 30 % of the total mass of sample being sieved. The largest aperture size sieve should be that on which not more than 5 % mass fraction of the sample is retained and t
30、he smallest aperture size sieve should be that through which not more than 5 % mass fraction of the sample passes.It is important to check the sieves from time to time, by the methods described in ISO 3310-1 and ISO 3310-2, to ensure that the aperture dimensions are within the specified tolerances.
31、Worn or damaged sieves can give rise to serious errors in size analysis and should be discarded.4.1.2 Receivers, for collecting material passing through the sieves.4.1.3 Weighing scale, capable of measuring the mass of the sample to be sieved to the nearest 0,1 %.4.1.4 Trays, smooth, of non-corrodib
32、le material, of at least 400 mm 400 mm, depending on the mass of sample and number of analysis required.4.1.5 Watch- or clock-glasses.4.2 For dry sieving4.2.1 Lids, to fit the test sieves.4.2.2 Flat brush, for cleaning the sieves and for brushing dust from the trays.4.2.3 Hardwood block, about 150 m
33、m long with a 10 mm 10 mm cross-section, for tapping the sieves.4.2.4 Shovel or scoop.4.2.5 Vibratory sieve shaker for mechanical sieving.4.3 For wet sieving4.3.1 Pressure filter.4.3.2 Buchner funnel and Buchner flask.4.3.3 Filter paper.4.3.4 Oven, capable of being controlled to 5 C in the range 30
34、C to 110 C.5 Sampling of test sampleThe sample shall be taken in accordance with ISO 13909 or ISO 18283, subject to the following provision:a) the number of increments and the increment masses, for both manual and mechanical sampling, should comply with the requirements of ISO 13909 or ISO 18283.orb
35、) the minimum mass of the gross sample should comply with Table 1.2 ISO 2015 All rights reservedBS ISO 1953:2015ISO 1953:2015(E)Table 1 Minimum mass of sample for size analysisNominal top size of coalMinimum mass for a precision of 1 %Minimum mass for a precision of 2 %mm kg kg300 54 000 13 500200 1
36、6 000 4 000150 6 750 1 700125 4 000 1 00090 1 500 40075 950 25063 500 12550 280 7045 200 5038 130 3031,5 65 1522,4 25 616,0 8 211,2 3 0,7010,0 2 0,508,0 1 0,255,6 0,50 0,254,0 0,25 0,252,8 0,25 0,252,0 0,25 0,251,0 0,25 0,25 0,5 0,25 0,25Preparation of test sample5.1 GeneralDrying is necessary if th
37、e coal is wet and dry sieving is to be performed. The gross sample may be divided if its mass greatly exceeds the value given in Table 1. If the gross sample is to be dried and divided, the division shall be carried out first whenever practicable. If no preparation is necessary, the test sample is t
38、he gross sample.5.2 DryingAir-dry the sample either at ambient temperature or at an elevated temperature not exceeding 40 C. Cool, if necessary, and allow the moisture content to come to equilibrium with the laboratory atmosphere.If caking or swelling tests are to be carried out subsequently on the
39、sample, the drying temperature should not exceed 40 C.5.3 Division (other than wet coal of nominal top size less than 4 mm)Divide the sample by means of a suitable mechanical sample divider or riffle avoiding size degradation and loss of dust. For sample that contains larger pieces of particle size
40、greater than say 50 mm, where a suitable mechanical sample divider or riffle is not available, use either the flattened heap method, ISO 2015 All rights reserved 3BS ISO 1953:2015ISO 1953:2015(E)the strip mixing and splitting method described in ISO 13909-4 and ISO 18283. Weigh all the coal not incl
41、uded as part of the test sample and retain it until all analyses and calculations are complete.5.4 Division of wet coal of nominal top size less than 4 mmSpread the gross sample on a clean flat surface, form into a cake 15 mm to 25 mm thick and extract a 2 kg sample by taking not less than 50 increm
42、ents, evenly spread over the cake, using an appropriate sampling scoop and bump plate. If further division is necessary, air-dry the divided sample first, as described in 6.2 and then proceed as described in 6.3.6 Procedure6.1 GeneralThe analysis shall be carried out by dry sieving (7.2) or by wet s
43、ieving (7.3).In general, dry sieving is suitable for most types of coal but wet sieving should be used if particles tend to agglomerate.NOTE 1 A combination of wet sieving (to remove fine material) and dry sieving can be appropriate and an example is given in Annex B.NOTE 2 When sieving coals, wet s
44、ieving may produce different results compared to dry sieving because the coals may contain percentages of clay and/or shales which may be soluble in water.The range of sieves used will depend on the type of coal and the purpose of the test. For example, a complete size analysis may be required for a
45、 run-of-mine coal or, in the simplest case, the amount of undersize in a graded product may be required. If the results are to be presented graphically, the range of sieves should comprise at least five different aperture sizes.During sieving it may be convenient either to weigh separately each cont
46、ainer with its size fraction and to subtract the mass of the empty container or to weigh one container with the fraction corresponding to the largest aperture size and to add successively all the other fractions, noting the cumulative mass after each addition. The first technique is preferred for sa
47、mples having a maximum particle size of 4 mm, so that the end point of sieving may be checked. The second technique is normally used for samples containing pieces having a particle size greater than 4 mm. However, if a detailed analysis of the individual size fractions is required, it is essential t
48、o use the first technique.A preliminary sieving on the smallest aperture size sieve is recommended when the sample contains a large proportion of very fine material.6.2 Dry sieving6.2.1 Sample of maximum particle size greater than 22,4 mmThe following procedure applies:a) Weigh the sample to be size
49、d to the nearest 0,1 % of the mass of the sample.b) Position the 22,4 mm aperture size sieve (4.1.1) over an empty receiver (4.1.2) so that the free fall of coal passing through the sieve into the receiver does not exceed 150 mm.c) Place the coal on the sieve and move the coal by hand. Hand place each piece of coal in turn and if in some position and without forcing, it passes through the sieve opening, it is designated as passing 22,4 mm. Alternatively a mechanical sieve shaker can be used to assist this p
