SIST ISO 13930:2000

SLOVENSKI STANDARD
SIST ISO 13930:2000
01-junij-2000
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Iron ores -- Dynamic test for low-temperature reduction-disintegration
Minerais de fer -- Essai dynamique de désagrégation par réduction à basse température
Ta slovenski standard je istoveten z: ISO 13930:1998
ICS:
73.060.10 Železove rude Iron ores
SIST ISO 13930:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 13930:2000

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SIST ISO 13930:2000
INTERNATIONAL ISO
STANDARD 13930
First edition
1998-08-01
Iron ores — Dynamic test for
low-temperature reduction-disintegration
Minerais de fer — Essai dynamique de désagrégation par réduction
à basse température
A
Reference number
ISO 13930:1998(E)

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SIST ISO 13930:2000
ISO 13930:1998(E)
Content
1 Scope .1
2 Normative references .1
3 Definitions and abbreviations .1
4 Principle.2
5 Apparatus .2
6 Test conditions .3
7 Sampling and sample preparation .3
8 Procedure .4
9 Expression of results .5
10 Test report .5
11 Verification .6
Annex A (normative) Repeatability and number of tests .9
Annex B (informative) Bibliography .10
©  ISO 1998
All rights reserved. Unless 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 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
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SIST ISO 13930:2000
© ISO
ISO 13930:1998(E)
Foreword
ISO (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 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 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 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 13930 was prepared by Technical Committee ISO/TC 102, Iron ores, Subcommittee
SC 3, Physical testing.
Annex A forms an integral part of this Interational Standard. Annex B is for information only.
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SIST ISO 13930:2000
© ISO
ISO 13930:1998(E)
Introduction
This International Standard describes a test method for evaluating the disintegration behaviour of iron ores reduced
in a rotating tube under specific conditions. The proportions of coarse fines, generated fines and dust remaining are
a measure of the degree of reduction-disintegration. The specific features of this test are:
a) the placing of a test portion of a specified size in a rotating tube;
b) isothermal reduction at a temperature of 500 °C;
c) measurement of the disintegration of the test portion by sieving after the reduction.
The method provides an indication of the physical stability of blast furnace burden materials under conditions
resembling those at the beginning of reduction under a weakly reducing atmosphere.
The results of this test should be considered in conjunction with the results of other reduction tests, particularly
those conducted at high temperatures.
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SIST ISO 13930:2000
INTERNATIONAL STANDARD  © ISO ISO 13930:1998(E)
Iron ores — Dynamic test for low-temperature
reduction-disintegration
WARNING — This standard may involve hazardous materials, operations or equipment. It does not purport
to address all the safety problems, if any, associated with its use. It is the responsibility of the user of this
standard to establish appropriate safety and health practices and determine the applicability of any
regulatory limitations prior to use.
1 Scope
This International Standard specifies a method for testing the disintegration of iron ores during reduction in a
rotating tube at a temperature of 500 °C.
The method is applicable to lump ores and pellets as blast furnace burden materials.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying 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.
1)
ISO 3310-1:— , Test sieves — Requirements and tests — Part 1: Metal wire cloth sieves.
ISO 10836:1994, Iron ores — Method of sampling and sample preparation for physical testing.
ISO 11323:1996, Iron ores — Vocabulary.
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this International Standard the definitions given in ISO 11323 and the following apply:
3.1.1
low-temperature disintegration indices
Relative indications of the size degradation of pellets and lump ores under conditions prevailing in the upper part of
a blast furnace shaft and obtained by a reduction test performed in a rotating tube. The indices are expressed as
the percentages represented by the +6,3 mm sieve fraction, the –3,15 mm sieve fraction and the –0,5 mm sieve
fraction, respectively.

1) To be published. (Revision of ISO 3310-1:1990)
1

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SIST ISO 13930:2000
© ISO
ISO 13930:1998(E)
3.2 Abbreviations
For the purposes of this International Standard, the following abbreviations apply:
LTD the disintegration index expressed in terms of the mass % of the +6,3 mm sieve fraction (the so-called
+6,3
disintegration strength)
LTD the disintegration index expressed in terms of the mass % of the –3,15 mm sieve fraction (the so-called
–3,15
disintegration index)
LTD the disintegration index expressed in terms of the mass % of the –0,5 mm sieve fraction (the so-called
–0,5
disintegration abrasion)
4 Principle
A test portion with a specified size range is reduced in a rotating tube at a temperature of 500 °C using reducing gas
consisting of carbon monoxide (CO), carbon dioxide (CO ), hydrogen (H ) and nitrogen (N ).
2 2 2
After 60 min reduction time, the test portion is cooled to a temperature below 100 °C and sieved with test sieves
having square mesh apertures of 6,3 mm, 3,15 mm and 0,5 mm.
The low-temperature disintegration (LTD) values are calculated as a quantitative measure of the degree of
disintegration of an iron ore that has been reduced while tumbling: the percentage masses of material greater than
6,3 mm, less than 3,15 mm and less than 0,5 mm, respectively, are related to the total mass of the test portion after
reduction.
5 Apparatus
Figure 1 shows a schematic example of the low-temperature disintegration test apparatus.
Figure 2 shows an example of an installation which could be used to measure the temperature and the temperature
distribution within the gas stream and the test portion in the reduction tube.
The test apparatus shall consist of the following main components:
5.1  Gas supply system, capable of supplying the gases and regulating the gas flow rates (flow meters indicated
by 1 in figure 1).
5.2  Reduction tube (6 in figure 1), made of non-scaling, heat-resisting metal to withstand a temperature higher
than 500 °C. The inside diameter of the reduction tube shall be 150 mm and its inside length 540 mm. Four equally
spaced lifters 540 mm long, 20 mm wide and 4 mm thick shall be mounted longitudinally inside the tube.
5.3  Thermocouples, for measuring the furnace temperature (4 in figure 1) and the temperature within the
reduction tube (2 in figure 1).
5.4  Furnace (7 in figure 1), having a heating capacity sufficient to reach the test temperature within 45 min and to
maintain the entire test portion at 500 °C ± 5 °C.
5.5  Dust collector (11 in figure 1), to trap any fine particles carried out of the tube in the gas stream during the
test.
5.6  Test sieves, having square mesh apertures of the following nominal sizes in accordance with ISO 3310-1:
16,0 mm; 12,5 mm; 11,2 mm; 10,0 mm; 6,3 mm; 3,15 mm and 0,5 mm.
5.7  Weighing device,
...