1、BSI Standards PublicationBS ISO 13930:2015Iron ores for blast furnacefeedstocks Determinationof low-temperature reduction-disintegration indices bydynamic methodBS ISO 13930:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 13930:2015. Itsupersedes BS ISO 13
2、930:2007 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ISE/58, Iron ores.A list of organizations represented on this committee can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 con
3、tract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 79288 5ICS 73.060.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the auth
4、ority of theStandards Policy and Strategy Committee on 31 August 2015.Amendments issued since publicationDate Text affectedBS ISO 13930:2015 ISO 2015Iron ores for blast furnace feedstocks Determination of low-temperature reduction-disintegration indices by dynamic methodMinerais de fer pour charges
5、de hauts fourneaux Dtermination des indices de dsintgration par rduction basse temprature, par mthode dynamiqueINTERNATIONAL STANDARDISO13930Third edition2015-08-01Reference numberISO 13930:2015(E)BS ISO 13930:2015ISO 13930:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015,
6、 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 internet or an intranet, without prior written permission. Pe
7、rmission 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 47copyrightiso.orgwww.iso.orgBS ISO 13930:2015ISO 13930:2015(E)F
8、oreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 15 Sampling, sample preparation and preparation of test portions 15.1 Sampling and sample preparation 15.2 Preparation of test portion . 26 Apparatus . 27 Test conditions . 37.1 General . 37.2 Reducing
9、gas . 37.2.1 Composition . 37.2.2 Purity . 37.2.3 Flow rate . 37.3 Heating and cooling gas 37.4 Temperature of the test portion . 38 Procedure. 48.1 Number of determinations for the test 48.2 Reduction . 48.3 Sieving 49 Expression of results 49.1 Calculation of the low-temperature disintegration ind
10、ices (LTD+6,3, LTD-3,15and LTD-0,5) 49.2 Repeatability and acceptance of test results . 510 Test report . 511 Verification . 6Annex A (normative) Flowsheet of the procedure for the acceptance of test results 9 ISO 2015 All rights reserved iiiContents PageBS ISO 13930:2015ISO 13930:2015(E)ForewordISO
11、 (the International Organization for Standardization) is a worldwide 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 com
12、mittee 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 the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrot
13、echnical 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 different approval criteria needed for the different types of ISO documents should be noted. This document was draft
14、ed 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 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rig
15、hts. 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/patents). Any trade name used in this document is information given for the convenience of users and does not consti
16、tute 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 principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe comm
17、ittee responsible for this document is ISO/TC 102, Iron ore and direct reduced iron, Subcommittee SC 3, Physical testing.This third edition cancels and replaces the second edition (ISO 13930:2007), of which it constitutes a minor revision to contemplate the care needed during hand sieving, to introd
18、uce the mechanical sieving and to exclude the reference to ISO 4701.iv ISO 2015 All rights reservedBS ISO 13930:2015ISO 13930:2015(E)IntroductionThis International Standard concerns one of a number of physical test methods that have been developed to measure various physical parameters and to evalua
19、te 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 made in different laboratories.The results of this test ha
20、ve to be considered in conjunction with other tests used to evaluate the quality of iron ores as feedstocks for blast furnace processes.This International Standard can be used to provide test results as part of a production quality control system, as a basis of a contract, or as part of a research p
21、roject. ISO 2015 All rights reserved vBS ISO 13930:2015BS ISO 13930:2015Iron ores for blast furnace feedstocks Determination of low-temperature reduction-disintegration indices by dynamic methodCAUTION This International Standard may involve hazardous operations and equipment. This International Sta
22、ndard 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 regulatory limitations prior to its use.1 ScopeThis Internat
23、ional Standard specifies a method to provide a relative measure for evaluating the degree of size degradation of iron ores when reduced under conditions resembling those prevailing in the low-temperature reduction zone of the blast furnace.This International Standard is applicable to lump ores and h
24、ot-bonded pellets.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. For undated references, the latest edition of the referenced document (in
25、cluding any amendments) applies.ISO 3082, Iron ores Sampling and sample preparation proceduresISO 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 plateISO
26、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 PrincipleThe test portion is isothermally reduced in a rotating tube bed, at 500 C, using a reducing gas consisting of CO, CO2, H2and N2, f
27、or 60 min. The reduced product is sieved with sieves having square openings of 6,30 mm, 3,15 mm and 500 m. Three low-temperature reduction-disintegration indices (LTD) are calculated as the mass percentage of material greater than 6,30 mm, less than 3,15 mm and less than 500 m.5 Sampling, sample pre
28、paration and preparation of test portions5.1 Sampling and sample preparationSampling of a lot and preparation of a test sample shall be in accordance with ISO 3082.The size ranges for pellets shall be either 16,0 mm + 12,5 mm or 12,5 mm + 10,0 mm.The size ranges for lump ores shall be 12,5 mm + 10,0
29、 mm.INTERNATIONAL STANDARD ISO 13930:2015(E) ISO 2015 All rights reserved 1BS ISO 13930:2015ISO 13930:2015(E)A test sample of at least 2,0 kg, on a dry basis, of the sized material shall be obtained.Oven-dry the test sample to constant mass at 105 C 5 C and cool it to room temperature before prepara
30、tion of the test portions.NOTE Constant mass is achieved when the difference in mass between two subsequent measurements becomes less than 0,05 % of the initial mass of the test sample.5.2 Preparation of test portionCollect each test portion by taking ore particles at random.At least four test porti
31、ons, each of approximately 500 g ( the mass of one particle) shall be prepared from the test sample.Weigh the test portions to the nearest 1 g and register the mass of each test portion on its recipient label.6 Apparatus6.1 GeneralThe test apparatus shall comprise the following:a) ordinary laborator
32、y equipment, such as an oven, hand tools, time-control device and safety equipment;b) reduction tube assembly;c) furnace, with a system to rotate the reduction tube;d) system to supply the gases and regulate the flow rates;e) test sieves;f) weighing device.Figure 1 shows an example of the test appar
33、atus.6.2 Reduction tube, made of non-scaling, heat-resistant metal to withstand temperatures higher than 500 C and resistant to deformation. The internal diameter shall be 150 mm and the internal length shall be 540 mm. Four equally spaced steel angle lifters, 540 mm long 20 mm high 4 mm thick, shal
34、l be solidly attached longitudinally inside the tube by welding, in such a manner as to prevent accumulation of material between the lifter and tube. A dust collector shall be connected to the tube to trap any fine particles carried in the gas stream out of the tube during the test. The tube shall b
35、e replaced, in any case, when its wall thickness is reduced to 3 mm in any area, and the lifters when their height is reduced to less than 18 mm.Figure 2 shows an example of a reduction tube.6.3 Furnace, having a heating capacity and temperature control able to reach the test temperature within 45 m
36、in and to maintain the entire test portion, as well as the gas entering the test portion, at 500 C 5 C.6.4 Rotation equipment, capable of rotating the reduction tube at a constant rate of 10 r/min 0,2 r/min.6.5 Gas-supply system, capable of supplying the gases and regulating gas flow rates.2 ISO 201
37、5 All rights reservedBS ISO 13930:2015ISO 13930:2015(E)6.6 Test sieves, conforming to ISO 3310-1 or ISO 3310-2 and having square apertures of the following nominal sizes: 6,30 mm; 3,15 mm; 500 m.6.7 Weighing device, capable of weighing the test sample and test portions to an accuracy of 0,1 g.7 Test
38、 conditions7.1 GeneralVolumes and flow rates of gases used are as measured at a reference temperature of 0 C and at a reference atmospheric pressure of 101,325 kPa (1,013 25 bar).7.2 Reducing gas7.2.1 CompositionThe reducing gas shall consist of the following:CO 20,0 % 0,5 % (volume fraction);CO220,
39、0 % 0,5 % (volume fraction);H22,0 % 0,2 % (volume fraction);CH458,0 % 1,0 % (volume fraction).7.2.2 PurityImpurities in the reducing gas shall not exceed the following:O20,1 % (volume fraction);H2O 0,2 % (volume fraction).7.2.3 Flow rateThe flow rate of the reducing gas, during the entire reducing p
40、eriod, shall be maintained at 20 L/min 1 L/min.7.3 Heating and cooling gasNitrogen (N2) shall be used as the heating and cooling gas. Impurities shall not exceed 0,1 % (volume fraction).The flow rate of N2shall be maintained at 20 L/min until the test portion reaches 500 C, during the temperature-eq
41、uilibration period and during cooling.7.4 Temperature of the test portionThe temperature of the entire test portion shall be maintained at 500 C 5 C during the entire reducing period and, as such, the reducing gas shall be preheated before entering the test portion. ISO 2015 All rights reserved 3BS
42、ISO 13930:2015ISO 13930:2015(E)8 Procedure8.1 Number of determinations for the testCarry out the test as many times as required by the procedure in Annex A.8.2 ReductionTake, at random, one of the test portions prepared in 5.2 and place it in the reduction tube (6.2).Insert the reduction tube into t
43、he furnace (6.3). Close the reduction tube, connect the thermocouple, ensuring that its tip is in the middle of the reduction tube, and connect the gas supply system.By means of the rotation equipment (6.4), commence rotation of the reduction tube at 10 r/min 0,2 r/min.Pass a flow of N2through the t
44、est portion at a rate of 20 L/min. Heat the test portion, bring the temperature inside the reduction tube to 500 C within 45 min and stabilize the temperature within the next 15 min. If this requirement is not met, discontinue the test and start a new one.DANGER Carbon monoxide, hydrogen and the red
45、ucing gas, which contains carbon monoxide and hydrogen, are toxic and explosive, and therefore hazardous. Testing shall be carried out in a well-ventilated area or under a hood. Precautions should be taken for the safety of the operator, in accordance with the safety codes of each country.Introduce
46、the reducing gas at a flow rate of 20 L/min 1 L/min to replace the N2. After 60 min of reduction, stop the flow of the reducing gas, stop the rotation of the reduction tube and cool the test portion to a temperature below 350 C in the reduction tube under N2at a flow rate of 20 L/min. Then lift the
47、reduction tube from the furnace and cool the test portion to below 100 C, still under the flow of inert gas.8.3 SievingRemove all the material carefully from the reduction tube, scraping, if necessary, to remove any material adhering to the tube wall.Determine and register the mass of the reduced ma
48、terial (m0) and sieve it with care on 6,30 mm, 3,15 mm and 500 m sieves. Determine and record the mass of each fraction retained on the 6,30 mm (m1), 3,15 mm (m2) and 500 m (m3) sieves. The dry weight of the dust trapped in the dust collector, and material lost during sieving, shall be considered to
49、 be part of the 500 m fraction.NOTE 1 Equivalent mechanical sieving can be used provided that preliminary test programme is carried out according to ISO 3086, the hand sieving being the reference method.NOTE 2 Sieving results are influenced by the sieve shaker characteristics. Therefore, in cases in which two or more laboratories need to compare their results for commercial or research purposes, they should adjust the sieving conditions until they obtain identical results for th
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