1、BSI Standards PublicationBS ISO 4700:2015Iron ore pellets for blastfurnace and direct reductionfeedstocks Determination ofthe crushing strengthBS ISO 4700:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 4700:2015. Itsupersedes BS ISO 4700:2007 which is wit
2、hdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ISE/58, Iron ores.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 resp
3、onsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 79294 6ICS 73.060.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards
4、 Policy and Strategy Committee on 31 August 2015.Amendments issued since publicationDate Text affectedBS ISO 4700:2015 ISO 2015Iron ore pellets for blast furnace and direct reduction feedstocks Determination of the crushing strengthBoulettes de minerais de fer pour charges de hauts fourneaux et rduc
5、tion directe Dtermination de la rsistance lcrasementINTERNATIONAL STANDARDISO4700Fourth edition2015-08-01Reference numberISO 4700:2015(E)BS ISO 4700:2015ISO 4700:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved. Unless otherwise
6、 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 internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
7、 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 47copyrightiso.orgwww.iso.orgBS ISO 4700:2015ISO 4700:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Ter
8、ms and definitions . 14 Principle 15 Sampling, sample preparation and preparation of test portions 15.1 Sampling and sample preparation . 15.2 Preparation of test portions 26 Apparatus . 27 Procedure. 27.1 Number of determinations for the test 27.2 Load application 38 Expression of results 49 Test r
9、eport . 410 Verification . 5 ISO 2015 All rights reserved iiiContents PageBS ISO 4700:2015ISO 4700:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is norm
10、ally 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, also take part in t
11、he work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the
12、 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 Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this docume
13、nt 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 development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/
14、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 specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO prin
15、ciples in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 102, Iron ore and direct reduced iron, Subcommittee SC 3, Physical testing.This fourth edition cancels and replaces the third edition (ISO
16、4700:2007) which has been technically revised to provide clarification in 7.2 when using automatic equipment.iv ISO 2015 All rights reservedBS ISO 4700:2015ISO 4700:2015(E)IntroductionThis International Standard concerns one of a number of physical test methods that have been developed to measure va
17、rious physical parameters and characteristics and to evaluate the behaviour of iron ores, including reducibility, disintegration, crushing strength, apparent density, etc. This method was developed to provide a uniform procedure, validated by collaborative testing, to facilitate comparisons of tests
18、 made in different laboratories.The results of this test have to be considered in conjunction with other tests used to evaluate the quality of iron ores as feedstocks for blast furnace and direct reduction processes.This International Standard can be used to provide test results as part of a product
19、ion quality-control system, as a basis of a contract, or as part of a research project. ISO 2015 All rights reserved vBS ISO 4700:2015BS ISO 4700:2015Iron ore pellets for blast furnace and direct reduction feedstocks Determination of the crushing strengthCAUTION This International Standard may invol
20、ve hazardous operations and equipment. This International Standard does not purport to address all of the safety issues associated with its use. It is the responsibility of the user of this International Standard to establish appropriate safety and health practices and determine the applicability of
21、 regulatory limitations prior to its use.1 ScopeThis International Standard specifies a method to provide a measure of the compressive load attained to cause breakage of pellets.This International Standard is applicable to hot bonded pellets.2 Normative referencesThe following documents, in whole or
22、 in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 3082, Iron ores Sampling and sample prep
23、aration proceduresISO 11323, Iron ore and direct reduced iron Vocabulary3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 11323 apply.4 PrincipleA single pellet of a specific size range is compressed at a specific speed. The procedure is repeated on all
24、 pellets in the test portion. The crushing strength is calculated as the arithmetic mean of all the measurements obtained.5 Sampling, sample preparation and preparation of test portions5.1 Sampling and sample preparationSampling of a lot and preparation of a test sample shall be in accordance with I
25、SO 3082.The size range for pellets shall be 12,5 mm +10,0 mm.A test sample of at least 1 kg, on a dry basis, of sized pellets shall be obtained.Oven-dry the test sample to constant mass at 105 C 5 C and cool it to room temperature before testing.NOTE Constant mass is achieved when the difference in
26、mass between two subsequent measurements becomes less than 0,05 % of the initial mass of the test sample.INTERNATIONAL STANDARD ISO 4700:2015(E) ISO 2015 All rights reserved 1BS ISO 4700:2015ISO 4700:2015(E)5.2 Preparation of test portionsOne test portion comprising at least 60 pellets, as agreed up
27、on at the time of order, shall be taken from the test sample by random selection.NOTE A method of determining the exact number of pellets to obtain a specific precision in the test results is to use the following equation:n =22wheren is the number of pellets; is the standard deviation, in newtons, d
28、erived from several experiments; is the required precision, in newtons, for 95 % confidence levels.6 Apparatus6.1 GeneralThe test apparatus shall comprise the following:a) ordinary laboratory equipment, such as an oven, hand tools and safety equipment;b) loading unit;c) load transmission system;d) l
29、oad indicator or recorder.6.2 Loading unit, formed by two compressive flat platens made of steel, installed in mutual parallel planes. The surface of the platens that will be in contact with the sample shall be made of surface-hardened steel. A device capable of setting the speed of the compressive
30、platen between 10 mm/min and 20 mm/min over the entire test period shall be used.NOTE If the platen speed is not constant during the test cycle, results may differ depending upon the test machine used. More uniform results may be obtained using a test machine that applies a constant load increase.6.
31、3 Load transmission system, which shall be either a load cell or a lever. The capacity of the load cell for transmission of the applied load to the indicating unit shall be at least 10 kN.6.4 Load indicator or recorder, which shall be either an electric indicator (digital read-out device, recording
32、chart, meter with needle rider or other suitable device) for the load-cell type, or a mechanical indicator (gauge equipped with a needle rider or other suitable device) for the lever type. When using a load cell, the chart-recorder pen-response time shall be 1,0 s or less for a full-scale deflection
33、. The minimum graduation shall be 1/100 of the full scale. The compression device shall be calibrated regularly.7 Procedure7.1 Number of determinations for the testCarry out the test on 60 or more single pellets (see the Note in 5.2).2 ISO 2015 All rights reservedBS ISO 4700:2015ISO 4700:2015(E)7.2
34、Load applicationPlace a test piece (single pellet) at the approximate centre of the surface-hardened portion of the lower platen. Apply the load at a constant platen speed between 10 mm/min and 20 mm/min throughout the test period.The test is complete when either the load falls to a value of 50 % or
35、 more of the maximum load recorded (see Figure 1), or the platen gap has reduced to 50 % of the initial mean test-piece diameter (see Figure 2).In either case, the crushing strength is the maximum load attained in the test.For automatic equipment, individual pellet strength values lower than 10 daN
36、shall be excluded from the calculation of results.KeyX contraction, %Y load1 1st peak2 2nd peak3 3rd peak4 stop5 strengthFigure 1 Measurement of crushing strength as explained in Example 1 in the procedure ISO 2015 All rights reserved 3BS ISO 4700:2015ISO 4700:2015(E)KeyX contraction, %Y load1 1st p
37、eak2 2nd peakFigure 2 Measurement of crushing strength as explained in Example 2 in the procedure8 Expression of resultsThe crushing strength, CS, is the arithmetic mean of all the measurements obtained.Express the result, in decanewtons per pellet, to one decimal place.9 Test reportThe test report
38、shall include the following information:a) a reference to this International Standard, i.e. ISO 4700;b) all details necessary for the identification of the sample;c) the name and address of the test laboratory;d) the date of the test;e) the date of the test report;f) the signature of the person resp
39、onsible for the test;g) the details of any operation and any test conditions not specified in this International Standard or regarded as optional, as well as any incident which may have had an influence on the results;h) the crushing strength, CS;i) the standard deviation of the measurements;4 ISO 2
40、015 All rights reservedBS ISO 4700:2015ISO 4700:2015(E)j) the size distribution of the sample for physical testing and the size range(s) of the pellets;k) a table of the relative frequency, in percent, or the measurements, classified at 50 daN intervals;l) the number of pellets in each specified siz
41、e range tested;m) the platen speed used, expressed in mm/min.10 VerificationRegular checking of the apparatus is essential to ensure test result reliability. The frequency of checking is a matter for each laboratory to determine.The conditions of the following items shall be checked: compressive pla
42、tes; compressive device; load cell or lever; load indicator; recording system;It is recommended that internal reference material be prepared and used periodically to check test repeatability.Appropriate records of verification activities shall be maintained. ISO 2015 All rights reserved 5BS ISO 4700
43、:2015ISO 4700:2015(E) ISO 2015 All rights reservedICS 73.060.10Price based on 5 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter. British
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