ISO 4696-2:2015

INTERNATIONAL ISO
STANDARD 4696-2
Third edition
2015-09-01
Iron ores for blast furnace
feedstocks — Determination of low-
temperature reduction-disintegration
indices by static method —
Part 2:
Reduction with CO and N2
Minerais de fer pour charges de hauts fourneaux — Détermination
des indices de désagrégation par réduction à basse température par
méthode statique —
Partie 2: Réduction avec CO et N2
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

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 portions . 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 . 4
7.3 Heating and cooling gas . 4
7.4 Temperature of the test portion . 4
8 Procedure. 4
8.1 Number of determinations for the test . 4
8.2 Reduction . 4
8.3 Tumbling . 4
8.4 Sieving . 5
9 Expression of results . 5
9.1 Calculation of the reduction-disintegration index (RDI−2 ) . 5
−2,8
9.2 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 .10
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
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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
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Any trade name used in this document is information given for the convenience of users and does not
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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 4696-2:2007), which has been technically
revised to address the care needed during hand sieving, to introduce the mechanical sieving and to
exclude the reference to ISO 4701.
ISO 4696 consists of the following parts, under the general title Iron ores for blast furnace feedstocks —
Determination of low-temperature reduction-disintegration indices by static method:
— Part 1: Reduction with CO, CO , H and N
2 2 2
— Part 2: Reduction with CO and N
iv © ISO 2015 – All rights reserved

Introduction
This part of ISO 4696 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 part of ISO 4696 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.
INTERNATIONAL STANDARD ISO 4696-2:2015(E)
Iron ores for blast furnace feedstocks — Determination of
low-temperature reduction-disintegration indices by static
method —
Part 2:
Reduction with CO and N2
CAUTION — This International Standard can 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 part of ISO 4696 specifies a method to provide a relative measure for evaluating the degree of
size degradation of iron ores when reduced with carbon monoxide and nitrogen, under conditions
resembling those prevailing in the low-temperature reduction zone of a blast furnace.
This part of ISO 4696 is applicable to lump ores, sinters 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 3082, Iron ores — Sampling and sample preparation procedures
ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
ISO 3310-2, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal
plate
ISO 11323, Iron ore and direct reduced iron — Vocabulary
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 isothermal
...