ISO-4696-2-1998.pdf
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1、A Reference number ISO 4696-2:1998(E) INTERNATIONAL STANDARD ISO 4696-2 First edition 1998-08-01 Iron ores Static test for low-temperature reduction-disintegration Part 2: Reaction with CO Minerais de fer Essai statique de dsagrgation par rduction basse temprature Partie 2: Raction avec CO Copyright
2、 International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 20:25:33 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4696-2:1998(E) ISO 1998 All rights reserved. Unless
3、otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-1211 Genve 2
4、0 Switzerland Internetisoiso.ch Printed in Switzerland ii Contents 1 Scope.1 2 Normative references.1 3 Principle.1 4 Apparatus2 5 Test conditions .4 5.1 Composition of reducing gas.4 5.2 Flow rate of reducing gas .4 5.3 Temperature of test .5 6 Sampling and sample preparation5 7 Procedure5 7.1 Numb
5、er of determinations5 7.2 Test portion5 7.3 Reduction .5 7.4 Tumbling and sieving6 8 Expression of results .6 9 Test report.6 10 Verification 7 Annex A (normative) Repeatability and number of tests8 Copyright International Organization for Standardization Provided by IHS under license with ISO Licen
6、see=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 20:25:33 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 4696-2:1998(E) iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (
7、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 on that committee. International organizations, go
8、vernmental 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. Draft International Standards adopted by the technical committees are circulated to
9、the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 4696-2 was prepared by Technical Committee ISO/TC 102, Iron ores, Subcommittee SC 3, Physical testing. Together with part 1, this
10、part of ISO 4696 cancels and replaces ISO 4696:1984, which has been technically revised. ISO 4696 consists of the following parts, under the general title Iron ores Static test for low-temperature reduction-disintegration: Part 1: Reaction with CO, CO2 and H2 Part 2: Reaction with CO Annex A forms a
11、n integral part of this part of ISO 4696. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 20:25:33 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4
12、696-2:1998(E) ISO iv Introduction This part of ISO 4696 describes a test method for evaluating the disintegration behaviour of iron ores reduced in a fixed bed under specific conditions. The specific features of this test are: a) isothermal reduction in a fixed bed at 550 C; b) tumbling the reduced
13、sample at room temperature; c) measurement of the disintegration of a test portion by sieving after tumbling. The results of this test should be considered in conjunction with the results of other tests, particularly those showing the physical behaviour of materials during reduction. ISO 4696-1 desc
14、ribes an alternative method adopting different test conditions. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 20:25:33 MDTNo reproduction or networking permitted without licens
15、e from IHS -,-,- INTERNATIONAL STANDARD ISOISO 4696-2:1998(E) 1 Iron ores Static test for low-temperature reduction- disintegration Part 2: Reaction with CO WARNING This part of ISO 4696 may involve hazardous materials, operations or equipment. It does not purport to address all the safety problems,
16、 if any, associated with its use. It is the responsibility of the user of this part of ISO 4696 to establish appropriate safety and health practices and to determine the applicability of any regulatory limitations prior to use. 1 Scope This part of ISO 4696 specifies a method for testing the disinte
17、gration of iron ores by tumbling, at room temperature, a test portion that has been reduced in a fixed bed at a temperature of 550 C. The method is applicable to natural iron ores and to iron ore agglomerates such as pellets or sinter. 2 Normative references The following standards contain provision
18、s which, through reference in this text, constitute provisions of this part of ISO 4696. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 4696 are encouraged to investigate the possibility of app
19、lying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 3082:1998, Iron ores Sampling and sample preparation procedures. ISO 3310-1: 1), Test sieves Requirements and tests Part 1: Metal wire cloth siev
20、es. ISO 3310-2: 2), Test sieves Requirements and tests Part 2: Perforated metal plate sieves. 3 Principle A test portion with a specified size range is subjected to static reduction at a temperature of 550 C using reducing gas consisting of carbon monoxide (CO) and nitrogen (N2). After 30 min reduct
21、ion time, the test portion is cooled to a temperature below 100 C and tumbled by using a small tumbler drum for 900 revolutions in total. It is then sieved with a test sieve having square mesh apertures of 2,8 mm. _ 1) To be published. (Revision of ISO 3310-1:1990) 2) To be published. (Revision of I
22、SO 3310-2:1990) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 20:25:33 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4696-2:1998(E) ISO 2 The re
23、duction-disintegration index (RDI-22,8) is calculated as a quantitative measure of the degree of disintegration of an iron ore that has been reduced and then tumbled: the percentage by mass of material less than 2,8 mm is related to the total mass of the test portion after reduction and before tumbl
24、ing. 4 Apparatus The apparatus shall consist of the following: a system to supply and regulate the gases; a reduction tube; an electrically heated furnace to heat the sample to the specified temperature; a tumbler drum; test sieves; a weighing device. 4.1 Reduction tube, made of non-scaling, heat-re
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