1、BSI Standards PublicationBS ISO 4696-1:2015Iron ores for blast furnacefeedstocks Determinationof low-temperature reduction-disintegration indices by staticmethodPart 1: Reduction with CO, CO2, H2 andN2BS ISO 4696-1:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation
2、of ISO 4696-1:2015. Itsupersedes BS ISO 4696-1:2007 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ISE/58, Iron ores.A list of organizations represented on this committee can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 i
3、nclude all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 79284 7ICS 73.060.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This Br
4、itish Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2015.Amendments issued since publicationDate Text affectedBS ISO 4696-1:2015 ISO 2015Iron ores for blast furnace feedstocks Determination of low-temperature reduction-disintegration indices by
5、 static method Part 1: Reduction with CO, CO2, H2 and N2Minerais de fer pour charges de hauts fourneaux Dtermination des indices de dsagrgation par rduction basse temprature par mthode statique Partie 1: Rduction avec CO, CO2, H2 et N2INTERNATIONAL STANDARDISO4696-1Third edition2015-09-01Reference n
6、umberISO 4696-1:2015(E)BS ISO 4696-1:2015ISO 4696-1:2015(E)ii ISO 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, e
7、lectronic 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 or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Ver
8、nier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 4696-1:2015ISO 4696-1:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 15 Sampling, sample preparation, and preparation of test portions 25.1 S
9、ampling and sample preparation . 25.2 Preparation of test portions 26 Apparatus . 26.1 General . 27 Test conditions . 37.1 General . 37.2 Reducing gas . 37.2.1 Composition . 37.2.2 Purity . 47.2.3 Flow rate . 47.3 Heating and cooling gas 47.4 Temperature of the test portion . 48 Procedure. 48.1 Numb
10、er of determinations for the test 48.2 Reduction . 48.3 Tumbling 58.4 Sieving 59 Expression of results 59.1 Calculation of the reduction-disintegration indices (RDI1+6,3, RDI13,15, RDI10,5). 59.2 Repeatability and acceptance of test results . 510 Test report . 611 Verification . 6Annex A (normative)
11、 Flowsheet of the procedure for the acceptance of test results .11 ISO 2015 All rights reserved iiiContents PageBS ISO 4696-1:2015ISO 4696-1:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of
12、 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-governmental
13、, 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 document and those intended for its further maintenance are described in the ISO
14、/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 Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibilit
15、y 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 development of the document will be in the Introduction and/or on the ISO list of pate
16、nt 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 specific terms and expressions related to conformity assessment, as well as inform
17、ation 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 102, Iron ore and direct reduced iron, Subcommittee SC 3, Physical testing.This third edition canc
18、els and replaces the second edition (ISO 4696-1:2007), which has been technically revised to address the care needed during hand sieving, to introduce the mechanical sieving and to exclude the reference to ISO 4701.ISO 4696 consists of the following parts, under the general title Iron ores for blast
19、 furnace feedstocks Determination of low-temperature reduction-disintegration indices by static method: Part 1: Reduction with CO, CO2, H2and N2 Part 2: Reduction with CO and N2iv ISO 2015 All rights reservedBS ISO 4696-1:2015ISO 4696-1:2015(E)IntroductionThis part of ISO 4696 concerns one of a numb
20、er of physical test methods that have been developed to measure various physical parameters 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 collaborati
21、ve testing, to facilitate comparisons of tests 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 processes.This part of ISO 4696 can be used to provide test results a
22、s part of a production quality control system, as a basis of a contract, or as part of a research project. ISO 2015 All rights reserved vBS ISO 4696-1:2015BS ISO 4696-1:2015Iron ores for blast furnace feedstocks Determination of low-temperature reduction-disintegration indices by static method Part
23、1: Reduction with CO, CO2, H2 and N2CAUTION This International Standard may involve hazardous operations and equipment. This 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 appropr
24、iate safety and health practices and determine the applicability of regulatory limitations prior to its use.1 ScopeThis part of ISO 4696 specifies a method to provide a relative measure for evaluating the degree of size degradation of iron ores when reduced with carbon monoxide, carbon dioxide, hydr
25、ogen, and nitrogen, under conditions resembling those prevailing in the low-temperature reduction zone of a blast furnace.This part of ISO 4696 is applicable to lump ores, sinters, and hot-bonded pellets.2 Normative referencesThe following documents, in whole or in part, are normatively referenced i
26、n 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 preparation proceduresISO 3310-1, Test sie
27、ves 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 11323, Iron ore and direct reduced iron Vocabulary3 Terms and definitionsFor the purposes of this document, the te
28、rms and definitions given in ISO 11323 apply.4 PrincipleThe test portion is isothermally reduced in a fixed bed, at 500 C, using a reducing gas consisting of CO, CO2, H2, and N2, for 60 min. The reduced test portion is tumbled in a specific tumble drum for 300 revolutions and then sieved with sieves
29、 having square openings of 6,30 mm, 3,15 mm, and 500 m. Three reduction-disintegration indices (RDI) are calculated as the mass percentage of material greater than 6,30 mm, less than 3,15 mm, and less than 500 m.INTERNATIONAL STANDARD ISO 4696-1:2015(E) ISO 2015 All rights reserved 1BS ISO 4696-1:20
30、15ISO 4696-1:2015(E)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 ISO 3082.The size range for pellets, sinters, and lump ores shall be 12,5 mm + 10,0 mm.A test sample o
31、f at least 2 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 preparation of the test portions.NOTE Constant mass is achieved when the difference in mass between two subsequent measurements becom
32、es less than 0,05 % of the initial mass of the test sample.5.2 Preparation of test portionsCollect each test portion by taking ore particles at random.NOTE Manual methods of division recommended in ISO 3082, such as riffling, can be applied to obtain the test portions.At least four test portions, ea
33、ch of approximately 500 g ( the mass of 1 particle) shall be prepared from the test sample.Weigh the test portions to the nearest 0,1 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 laboratory equip
34、ment, such as an oven, hand tools, a time-control device, and safety equipment;b) reduction-tube assembly;c) furnace;d) system to supply the gases and regulate the flow rates;e) tumble drum;f) test sieves;g) weighing device.Figure 1 shows an example of the test apparatus.6.2 Reduction tube, made of
35、non-scaling, heat-resistant metal to withstand temperatures higher than 600 C, and resistant to deformation.The internal diameter shall be 75 mm 1 mm. A removable perforated plate made of non-scaling, heat-resistant metal to withstand temperatures higher than 600 C shall be mounted in the reduction
36、tube to support the test portion and to ensure uniform gas flow through it. The perforated plate shall be 4 mm thick, with a diameter 1 mm less than the internal diameter of the tube. The holes in the plate shall be 2 mm to 3 mm in diameter at a pitch centre distance of 4 mm to 5 mm.Figure 2 shows a
37、n example of a reduction tube.2 ISO 2015 All rights reservedBS ISO 4696-1:2015ISO 4696-1:2015(E)6.3 Furnace, having a heating capacity and temperature control able to maintain the entire test portion, as well as gas entering the bed, at 500 C 5 C.6.4 Porcelain balls, having a size range between 10,0
38、 mm and 12,5 mm and of sufficient quantity to form a double-layer bed on the perforated plate.6.5 Gas-supply system, capable of supplying the gases and regulating gas flow rates.6.6 Tumble drum, made of steel, at least 5 mm thick, having an internal diameter of 130 mm and an inside length of 200 mm.
39、Two equally spaced steel lifters (200 mm long, 20 mm high, and 2 mm thick) shall be mounted longitudinally inside the drum. These can be mounted on a frame that can be inserted inside the vessel from one end. One end of the drum shall be closed and the other open. A close-fitting lid shall be held i
40、n place on the opening to ensure a dust-tight seal. The drum shall be replaced in any case when the thickness of the vessel wall is reduced to 3 mm in any area, and the lifters when their height is reduced to less than 18 mm.Figure 3 shows an example of a tumble drum.6.7 Rotation equipment, capable
41、of ensuring that the drum attains full speed in one revolution, rotates at a constant speed of 30 r/min 1 r/min and stops within one revolution.The equipment shall be fitted with a revolution counter and with an automatic device for stopping the drum after a predetermined number of revolutions.6.8 T
42、est 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, and 500 m.6.9 Weighing device, capable of weighing the test sample and test portions to an accuracy of 0,1 g.7 Test conditions7.1 GeneralVolumes and flow rates of gases ar
43、e 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)CO220,0 % 0,5 % (volume fraction)H22,0 % 0,5 % (volume fraction)N258
44、,0 % 0,5 % (volume fraction) ISO 2015 All rights reserved 3BS ISO 4696-1:2015ISO 4696-1:2015(E)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 pe
45、riod, 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 5 L/min until the test portion reaches 500 C, and at 20 L/min during the
46、temperature-equilibration period. During cooling, it shall be maintained at 5 L/min.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 t
47、est portion.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 ReductionPlace a double-layer bed of porcelain balls (6.4) in the reduction tube (6.2) on the perforated plate.Take, at random, one of the test portions prepar
48、ed in 5.2. Place it in the reduction tube (6.2) and level its surface.Close the top of the reduction tube. Connect the thermocouple, ensuring that its tip is in the centre of the test portion.Insert the reduction tube into the furnace (6.3).Connect the gas-supply system (6.5).Pass a flow of N2throug
49、h the test portion at a rate of at least 5 L/min and commence heating. When the temperature of the test portion approaches 500 C, increase the flow rate to 20 L/min. Continue heating while maintaining the flow of N2until the test portion reaches 500 C 5 C. Allow a period of 15 min for temperature equilibration at 500 C.DANGER Carbon monoxide and the reducing gas, which contains carbon monoxide, are toxic and therefore hazardous. Testing shall be carried out in a well ventil
