ISO 11257:2015
(Main)Iron ores for shaft direct-reduction feedstocks — Determination of the low-temperature reduction-disintegration index and degree of metallization
Iron ores for shaft direct-reduction feedstocks — Determination of the low-temperature reduction-disintegration index and degree of metallization
ISO 11257:2015 specifies a method to provide a relative measure for evaluating the degree of size degradation and degree of metallization of iron ores, when reduced under conditions resembling those prevailing in shaft direct-reduction processes. ISO 11257:2015 is applicable to lump ores and hot-bonded pellets.
Minerais de fer pour charges utilisées dans les procédés par réduction directe — Détermination de l'indice de désintégration par réduction à basse température et du degré de métallisation
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INTERNATIONAL ISO
STANDARD 11257
Third edition
2015-08-15
Iron ores for shaft direct-reduction
feedstocks — Determination of
the low-temperature reduction-
disintegration index and degree of
metallization
Minerais de fer pour charges utilisées dans les procédés par réduction
directe — Détermination de l’indice de désintégration par réduction à
basse température et du degré de métallisation
Reference number
ISO 11257:2015(E)
©
ISO 2015
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ISO 11257:2015(E)
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ii © ISO 2015 – All rights reserved
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ISO 11257:2015(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Sampling, sample preparation, and preparation of test portions . 2
5.1 Sampling and sample preparation . 2
5.2 Preparation of test portion . 2
6 Apparatus . 2
6.1 General . 2
7 Test conditions . 3
7.1 General . 3
7.2 Reducing gas . 3
7.2.1 Composition . 3
7.2.2 Purity . 3
7.2.3 Flow rate . 3
7.3 Heating and cooling gas . 3
7.4 Temperature of the test portion . 3
8 Procedure. 4
8.1 Number of determinations for the test . 4
8.2 Reduction . 4
8.3 Sieving . 4
8.4 Chemical analysis . 4
9 Expression of results . 5
9.1 Calculation of the reduction-disintegration index (RDI ) . 5
DR
9.2 Calculation of the degree of metallization (M) . 5
9.3 Repeatability and acceptance of test results . 5
10 Test report . 6
11 Verification . 6
Annex A (normative) Flowsheet of the procedure for the acceptance of test results .8
Bibliography . 9
© ISO 2015 – All rights reserved iii
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ISO 11257:2015(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.
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 drafted 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 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 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
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT), see the following URL: Foreword — Supplementary information
The committee 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 11257:2007), of which it constitutes
a minor revision to contemplate the care needed during hand sieving, to introduce the mechanical
sieving and to exclude the reference to ISO 4701.
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ISO 11257:2015(E)
Introduction
This International Standard concerns one of a number 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 collaborative 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 direct reduction 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 project.
© ISO 2015 – All rights reserved v
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INTERNATIONAL STANDARD ISO 11257:2015(E)
Iron ores for shaft direct-reduction feedstocks —
Determination of the low-temperature reduction-
disintegration index and degree of metallization
CAUTION — This International Standard can involve hazardous operations and equipment.
International 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 appropriate safety
and health practices and determine the applicability of regulatory limitations prior to its use.
1 Scope
This International Standard specifies a method to provide a relative measure for evaluating the degree
of size degradation and degree of metallization of iron ores, when reduced under conditions resembling
those prevailing in shaft direct-reduction processes.
This International Standard is applicable to lump ores and hot-bonded pellets.
2 Normative references
The 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 (including any amendments) applies.
ISO 2597-1, Iron ores — Determination of total iron content — Part 1: Titrimetric method after tin(II)
chloride reduction
ISO 2597-2, Iron ores — Determination of total iron content – Part 2:
...
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