ISO 3271:2015

INTERNATIONAL ISO
STANDARD 3271
Fifth edition
2015-08-01
Iron ores for blast furnace and
direct reduction feedstocks —
Determination of the tumble and
abrasion indices
Minerais de fer pour charges de hauts fourneaux et pour procédés par
réduction directe — Détermination des indices de cohésion et d’abrasion
Reference number
ISO 3271:2015(E)
©
ISO 2015

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ISO 3271:2015(E)

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© ISO 2015, Published in Switzerland
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ISO 3271:2015(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 . 1
5.1 Sampling and sample preparation . 1
5.2 Preparation of test portions . 2
6 Apparatus . 2
6.1 General . 2
7 Procedure. 3
7.1 Number of determinations for the test . 3
7.2 Tumbling . 3
7.3 Sieving . 3
8 Expression of results . 3
8.1 Calculation of the tumble index (TI) and abrasion index (AI) . 3
8.2 Repeatability and acceptance of test results . 4
9 Test report . 4
10 Verification . 4
Annex A (normative) Flowsheet of the procedure for the acceptance of test results .6
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ISO 3271:2015(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 fifth edition cancels and replaces the fourth edition (ISO 3271:2007), 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 3271:2015(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 blast furnace and 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.
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INTERNATIONAL STANDARD ISO 3271:2015(E)
Iron ores for blast furnace and direct reduction feedstocks —
Determination of the tumble and abrasion indices
CAUTION — This International Standard may involve hazardous operations and equipment. This
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
resistance of iron ores to size degradation by impact and abrasion. It covers the determination of the
tumble and abrasion indices.
This International Standard is applicable to lump ores, sinters, and hot-bonded pellets.
2 Normative references
The follo
...