ISO 11257:1998

Iron ores — Determination of disintegration and metallization of feedstock for direct reduction by gas reforming processes

Minerais de fer — Détermination de la dégradation et de la métallisation des charges utilisées dans les procédés de reforming par réduction directe

Železove rude – Ugotavljanje razpada in metalizacije vhodne surovine za direktno redukcijo s procesi transformacije plinov

General Information

• Status: Withdrawn
• Publication Date: 08-Jul-1998
• Withdrawal Date: 08-Jul-1998
• ICS: 73.060.10 - Iron ores
• Technical Committee: ISO/TC 102/SC 3 - Physical testing
• Drafting Committee: ISO/TC 102/SC 3 - Physical testing
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 31-Oct-2007
• Ref Project: SIST ISO 11257:2001 - Iron ores -- Determination of disintegration and metallization of feedstock for direct reduction by gas reforming processes

Relations

• Revised: ISO 11257:2007 - Iron ores for shaft direct-reduction feedstocks — Determination of the low-temperature reduction-disintegration index and degree of metallization
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 11257
First edition
1998-07-01
Iron ores — Determination of disintegration
and metallization of feedstock for direct
reduction by gas reforming processes
Minerais de fer — Détermination de la dégradation et de la métallisation des
charges utilisées dans les procédés de reforming par réduction directe
A
Reference number
ISO 11257:1998(E)

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ISO 11257:1998(E)
Contents Page
1 Scope .1
2 Normative references .1
3 Definitions .1
4 Principle.2
5 Apparatus .2
6 Test conditions .3
6.1 General.3
6.2 Composition of reducing gas.3
6.3 Purity of reducing gas.3
6.4 Flow rate of reducing gas .3
6.5 Purity of heating and cooling gas.3
6.6 Temperature of test .3
7 Sampling and sample preparation .3
8 Procedure .4
8.1 Number of determinations .4
8.2 Test portion .4
8.3 Reduction .4
9 Expression of results .5
9.1 Reduction-disintegration index (RDI ).5
DR
9.2 Degree of metallization (M) .5
9.3 Number of tests and permissible tolerance.5
10 Test report .6
11 Verification .6
Annex A (normative) Flowsheet of the procedure for the acceptance of test results .7
Annex B (informative) Bibliography .8
©  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 [e-mail]
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii

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©
ISO ISO 11257:1998(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 11257 was prepared by Technical Committee ISO/TC 102, Iron ores, Subcommittee
SC 5, Physical testing for direct reduction.
Annex A forms an integral part of this International Standard. Annex B is for information only.
iii

---------------------- Page: 3 ----------------------
©
ISO 11257:1998(E) ISO
Introduction
Direct reduction processes are intended to reduce iron ores partially, or almost completely by thermal processes to
form high grade feedstocks for iron- and steelmaking. Several kinds of direct reduction processes are in operation
worldwide and others are still under development. The behaviour of the iron ores, as feedstock, may vary from
process to process. ISO 11257 was prepared addressing specificaly the direct reduction by gas reforming
processes.
The obtained proportion of generated fines is a relative measure of the disintegration behaviour and the degree of
metallization is a measure of the metallization behaviour of the iron ore.
The results of this test should be considered in conjunction with the results of other tests used to evaluate the
quality of iron ores for direct reduction processes.
iv

---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD  © ISO ISO 11257:1998(E)
Iron ores — Determination of disintegration and metallization of
feedstock for direct reduction by gas reforming processes
WARNING — This International Standard may involve hazardous materials, operations and equipment.
This International Standard does not purport to address all of the safety problems 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 Scope
This International Standard specifies a test method for evaluating the disintegration and metallization behaviour of
iron ore pellets and lumps under conditions that resemble the ones prevailing in direct reduction by gas reforming
1)
processes, such as the Midrex-type process.
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 2597-1:1994, Iron ores — Determination of total iron content — Part 1: Titrimetric methods after tin(II) chloride
reduction.
 2)
ISO 3310-1:— , Test sieves — Requirements and tests — Part 1: Metal wire cloth sieves.
 3)
ISO 4701:— , Iron ores — Determination of size distribution by sieving.
ISO 5416:1997, Direct reduced iron — Determination of metallic iron content — Bromine-methanol titrimetric
method.
ISO 9507:1990, Iron ores — Determination of total iron content — Titanium(III) chloride reduction methods.
ISO 9508:1990, Iron ores — Determination of total iron content — Silver reduction titrimetric method.
ISO 10836:1994, Iron ores — Method of sampling and sample preparation for physical testing.
ISO 11323:1996, Iron ores — Vocabulary.
3 Definitions
For the purposes of this International Standard the definitions given in ISO 11323 and the following apply:
3.1  reduction-disintegration: Size degradation of lump ores or agglomerates resulting under reduction test
conditions that resemble the ones prevailing in the direct reduction processes.
___________
1)  Midrex is a trade-name used by Midrex International B.V. This information is given for the convenience of users of this
International Standard and does not constitute an endorsement by ISO of the method named. Equivalent methods may be
used if they can be shown to lead to the same results.
2)  To be published. (Revision of ISO 3310-1:1990)
3)  To be published. (Revision of ISO 4701:1985)
1

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©
ISO
ISO 11257:1998(E)
4 Principle
Isothermal reduction of the test portion in a rotation tube by reducing gas consisting of H , CO, CO and CH at
2 2 4
temperatu
...

SLOVENSKI STANDARD
SIST ISO 11257:2001
01-junij-2001
Železove rude – Ugotavljanje razpada in metalizacije vhodne surovine za direktno
redukcijo s procesi transformacije plinov
Iron ores -- Determination of disintegration and metallization of feedstock for direct
reduction by gas reforming processes
Minerais de fer -- Détermination de la dégradation et de la métallisation des charges
utilisées dans les procédés de reforming par réduction directe
Ta slovenski standard je istoveten z: ISO 11257:1998
ICS:
73.060.10 Železove rude Iron ores
SIST ISO 11257:2001 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 11257:2001

---------------------- Page: 2 ----------------------

SIST ISO 11257:2001
INTERNATIONAL ISO
STANDARD 11257
First edition
1998-07-01
Iron ores — Determination of disintegration
and metallization of feedstock for direct
reduction by gas reforming processes
Minerais de fer — Détermination de la dégradation et de la métallisation des
charges utilisées dans les procédés de reforming par réduction directe
A
Reference number
ISO 11257:1998(E)

---------------------- Page: 3 ----------------------

SIST ISO 11257:2001
ISO 11257:1998(E)
Contents Page
1 Scope .1
2 Normative references .1
3 Definitions .1
4 Principle.2
5 Apparatus .2
6 Test conditions .3
6.1 General.3
6.2 Composition of reducing gas.3
6.3 Purity of reducing gas.3
6.4 Flow rate of reducing gas .3
6.5 Purity of heating and cooling gas.3
6.6 Temperature of test .3
7 Sampling and sample preparation .3
8 Procedure .4
8.1 Number of determinations .4
8.2 Test portion .4
8.3 Reduction .4
9 Expression of results .5
9.1 Reduction-disintegration index (RDI ).5
DR
9.2 Degree of metallization (M) .5
9.3 Number of tests and permissible tolerance.5
10 Test report .6
11 Verification .6
Annex A (normative) Flowsheet of the procedure for the acceptance of test results .7
Annex B (informative) Bibliography .8
©  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 [e-mail]
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii

---------------------- Page: 4 ----------------------

SIST ISO 11257:2001
©
ISO ISO 11257:1998(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 11257 was prepared by Technical Committee ISO/TC 102, Iron ores, Subcommittee
SC 5, Physical testing for direct reduction.
Annex A forms an integral part of this International Standard. Annex B is for information only.
iii

---------------------- Page: 5 ----------------------

SIST ISO 11257:2001
©
ISO 11257:1998(E) ISO
Introduction
Direct reduction processes are intended to reduce iron ores partially, or almost completely by thermal processes to
form high grade feedstocks for iron- and steelmaking. Several kinds of direct reduction processes are in operation
worldwide and others are still under development. The behaviour of the iron ores, as feedstock, may vary from
process to process. ISO 11257 was prepared addressing specificaly the direct reduction by gas reforming
processes.
The obtained proportion of generated fines is a relative measure of the disintegration behaviour and the degree of
metallization is a measure of the metallization behaviour of the iron ore.
The results of this test should be considered in conjunction with the results of other tests used to evaluate the
quality of iron ores for direct reduction processes.
iv

---------------------- Page: 6 ----------------------

SIST ISO 11257:2001
INTERNATIONAL STANDARD  © ISO ISO 11257:1998(E)
Iron ores — Determination of disintegration and metallization of
feedstock for direct reduction by gas reforming processes
WARNING — This International Standard may involve hazardous materials, operations and equipment.
This International Standard does not purport to address all of the safety problems 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 Scope
This International Standard specifies a test method for evaluating the disintegration and metallization behaviour of
iron ore pellets and lumps under conditions that resemble the ones prevailing in direct reduction by gas reforming
1)
processes, such as the Midrex-type process.
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 2597-1:1994, Iron ores — Determination of total iron content — Part 1: Titrimetric methods after tin(II) chloride
reduction.
 2)
ISO 3310-1:— , Test sieves — Requirements and tests — Part 1: Metal wire cloth sieves.
 3)
ISO 4701:— , Iron ores — Determination of size distribution by sieving.
ISO 5416:1997, Direct reduced iron — Determination of metallic iron content — Bromine-methanol titrimetric
method.
ISO 9507:1990, Iron ores — Determination of total iron content — Titanium(III) chloride reduction methods.
ISO 9508:1990, Iron ores — Determination of total iron content — Silver reduction titrimetric method.
ISO 10836:1994, Iron ores — Method of sampling and sample preparation for physical testing.
ISO 11323:1996, Iron ores — Vocabulary.
3 Definitions
For the purposes of this International Standard the definitions given in ISO 11323 and the following apply:
3.1  reduction-disintegration: Size degradation of lump ores or agglomerates resulting under reduction test
conditions that resemble the ones prevailing in the direct reduction processes.
___________
1)  Midrex is a trade-name used by Midrex International B.V. This information is given for
...