ISO 11257:2007
(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 11257:2007 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 11257:2007 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
Second edition
2007-10-15
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 11257:2007(E)
©
ISO 2007
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ISO 11257:2007(E)
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ii © ISO 2007 – All rights reserved
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ISO 11257:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Principle. 2
5 Sampling, sample preparation and preparation of test portions. 2
6 Apparatus . 2
7 Test conditions . 3
8 Procedure . 4
9 Expression of results . 5
10 Test report . 6
11 Verification . 6
Annex A (normative) Flowsheet of the procedure for the acceptance of test results . 8
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ISO 11257:2007(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. 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.
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.
ISO 11257 was prepared by Technical Committee ISO/TC 102, Iron ore and direct reduced iron,
Subcommittee SC 3, Physical testing.
This second edition cancels and replaces the first edition (ISO 11257:1998), which has been revised to
homogenise with other physical test standards.
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ISO 11257:2007(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 should be considered in conjunction with other tests used to evaluate the quality of iron
ores as feedstocks for direct-reduction processes.
This International Standard may 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.
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INTERNATIONAL STANDARD ISO 11257:2007(E)
Iron ores for shaft direct-reduction feedstocks — Determination
of the low-temperature reduction-disintegration index and
degree of metallization
CAUTION — This International Standard may involve hazardous materials, 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 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 referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 2597-1:2006, Iron ores — Determination of total iron content — Part 1: Titrimetric method after tin (II)
chloride reduction
1)
ISO 3082:2000 , Iron ores — Sampling and sample preparation procedures
ISO 3310-1:2000, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
ISO 3310-2:1999, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated
metal plate
2)
ISO 4701:— , Iron ores and direct reduced iron — Determination of size distribution by sieving
ISO 5416:2006, Direct reduced iron — Determination of metallic iron — Bromine-methanol titrimetric method
ISO 9507:1990, Iron ores — Determination of total iron content — Titanium (III) chloride reduction methods
ISO 11323:2002, Iron ore and direct reduced iron — Vocabulary
1) Under revision to incorporate ISO 10836, Iron ores — Method of sampling and sample preparation for physical testing.
2) To be published. (Revision of ISO 4701:1999)
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ISO 11257:2007(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 11323 apply.
4 Principle
The test portion is isothermally reduced in a rotating tube bed, at 760 °C, using a reducing gas consisting of
H , CO, CO and CH , for 300 min. The reduced product is sieved with a sieve having square openings of
2 2 4
3,15 mm. Then it is analysed for total iron and metallic iron. The reduction-disintegration index is calculated as
the mass percentage of material less than 3,15 mm. The degree of metallization is calculated from the
chemical analysis results.
5 Sampling, sample preparation and preparation of test portions
5.1 Sampling and sample preparation
Sampling of a lot and preparation of a test sample shall be in accordance with ISO 3082.
The size ranges for pellets shall be 50 % −16,0 mm +12,5 mm, and 50 % −12,5 mm +10,0 mm.
The size ranges for lump ores shall be 50 % −20,0 mm +16,0 mm, and 50 % −16,0 mm +10,0 mm.
A test sample of at least 2,0 kg, on a dry basis, of the sized material shall be obtained.
O
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