SIST ISO 4696-2:2000

Iron ores -- Static test for low-temperature reduction-disintegration -- Part 2: Reaction with CO

Minerais de fer -- Essai statique de désagrégation par réduction à basse température -- Partie 2: Réaction avec CO

Železove rude - Statični preskus za nizkotemperaturni redukcijski razpad - 2. del: Reakcija s CO

General Information

• Status: Withdrawn
• Publication Date: 31-May-2000
• Withdrawal Date: 11-May-2010
• ICS: 73.060.10 - Iron ores
• Technical Committee: I12 - Imaginarni 12 Imaginarni TC za ISO področje - vzdrževani privzeti ISO standardi
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 11-May-2010
• Due Date: 03-Jun-2010
• Completion Date: 12-May-2010
• Ref Project: ISO 4696-2:1998 - Iron ores — Static test for low-temperature reduction-disintegration — Part 2: Reaction with CO

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 4696-2
First edition
1998-08-01
Iron ores — Static test for low-temperature
reduction-disintegration —
Part 2:
Reaction with CO
Minerais de fer — Essai statique de désagrégation par réduction à basse
température —
Partie 2: Réaction avec CO
A
Reference number
ISO 4696-2:1998(E)

---------------------- Page: 1 ----------------------
ISO 4696-2:1998(E)
Contents
1 Scope .1
2 Normative references .1
3 Principle.1
4 Apparatus .2
5 Test conditions .4
5.1 Composition of reducing gas.4
5.2 Flow rate of reducing gas .4
5.3 Temperature of test .5
6 Sampling and sample preparation .5
7 Procedure .5
7.1 Number of determinations .5
7.2 Test portion .5
7.3 Reduction .5
7.4 Tumbling and sieving.6
8 Expression of results .6
9 Test report .6
10 Verification .7
(normative)
Annex A Repeatability and number of tests .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]
Printed in Switzerland
ii

---------------------- Page: 2 ----------------------
© ISO
ISO 4696-2:1998(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 4696-2 was prepared by Technical Committee ISO/TC 102, Iron ores, Subcommittee
SC 3, Physical testing.
Together with part 1, this part of ISO 4696 cancels and replaces ISO 4696:1984, which has been technically
revised.
ISO 4696 consists of the following parts, under the general title Iron ores — Static test for low-temperature
reduction-disintegration:
—  Part 1: Reaction with CO, CO and H
2 2
—  Part 2: Reaction with CO
Annex A forms an integral part of this part of ISO 4696.
iii

---------------------- Page: 3 ----------------------
© ISO
ISO 4696-2:1998(E)
Introduction
This part of ISO 4696 describes a test method for evaluating the disintegration behaviour of iron ores reduced in a
fixed bed under specific conditions. The specific features of this test are:
a) isothermal reduction in a fixed bed at 550 °C;
b) tumbling the reduced sample at room temperature;
c) measurement of the disintegration of a test portion by sieving after tumbling.
The results of this test should be considered in conjunction with the results of other tests, particularly those showing
the physical behaviour of materials during reduction.
ISO 4696-1 describes an alternative method adopting different test conditions.
iv

---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD  © ISO ISO 4696-2:1998(E)
Iron ores — Static test for low-temperature reduction-
disintegration —
Part 2:
Reaction with CO
WARNING — This part of ISO 4696 may involve hazardous materials, operations or equipment. It does not
purport to address all the safety problems, if any, associated with its use. It is the responsibility of the user
of this part of ISO 4696 to establish appropriate safety and health practices and to determine the
applicability of any regulatory limitations prior to use.
1 Scope
This part of ISO 4696 specifies a method for testing the disintegration of iron ores by tumbling, at room temperature,
a test portion that has been reduced in a fixed bed at a temperature of 550 °C.
The method is applicable to natural iron ores and to iron ore agglomerates such as pellets or sinter.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of
ISO 4696. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
parties to agreements based on this part of ISO 4696 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 3082:1998, Iron ores — Sampling and sample preparation procedures.
1)
ISO 3310-1:— , Test sieves — Requirements and tests — Part 1: Metal wire cloth sieves.
2)
ISO 3310-2:— , Test sieves — Requirements and tests — Part 2: Perforated metal plate sieves.
3 Principle
A test portion with a specified size range is subjected to static reduction at a temperature of 550 °C using reducing
gas consisting of carbon monoxide (CO) and nitrogen (N ).
2
After 30 min reduction time, the test portion is cooled to a temperature below 100 °C and tumbled by using a small
tumbler drum for 900 revolutions in total. It is then sieved with a test sieve having square mesh apertures of 2,8 mm.
______________
1) To be published. (Revision of ISO 3310-1:1990)
2) To be published. (Revision of ISO 3310-2:1990)
1

---------------------- Page: 5 ----------------------
© ISO
ISO 4696-2:1998(E)
The reduction-disintegration index (RDI-2 ) is calculated as a quantitative measure of the degree of disintegration
–2,8
of an iron ore that has been reduced and then tumbled: the percentage by mass of material less than 2,8 mm is
related to the total mass of the test portion after reduction and before tumbling.
4 Apparatus
The apparatus shall consist of the following:
• a system to supply and regulate the gases;
• a reduction tube;
• an electrically heated furnace to heat the sample to the specified temperature;
• a tumbler drum;
• test sieves;
• a weighing device.
4.1  Reduction tube, made of non-scaling, heat-resisting metal to withstand a temperature of greater than 600 °C.
The diameter of the sample bed shall be 75 mm ±1 mm.
Figure 1 shows an example of such a reduction tube.
The test portion may be placed on a perforated plate or, if desired, on balls of alumina on the perforated plate, in
order to ensure a uniform flow of gas through the test portion.
4.2  Furnace, having a heating capacity suffi
...

SLOVENSKI STANDARD
SIST ISO 4696-2:2000
01-junij-2000
äHOH]RYHUXGH6WDWLþQLSUHVNXV]DQL]NRWHPSHUDWXUQLUHGXNFLMVNLUD]SDGGHO
5HDNFLMDV&2
Iron ores -- Static test for low-temperature reduction-disintegration -- Part 2: Reaction
with CO
Minerais de fer -- Essai statique de désagrégation par réduction à basse température --
Partie 2: Réaction avec CO
Ta slovenski standard je istoveten z: ISO 4696-2:1998
ICS:
73.060.10 Železove rude Iron ores
SIST ISO 4696-2:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ISO 4696-2:2000

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

SIST ISO 4696-2:2000
INTERNATIONAL ISO
STANDARD 4696-2
First edition
1998-08-01
Iron ores — Static test for low-temperature
reduction-disintegration —
Part 2:
Reaction with CO
Minerais de fer — Essai statique de désagrégation par réduction à basse
température —
Partie 2: Réaction avec CO
A
Reference number
ISO 4696-2:1998(E)

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

SIST ISO 4696-2:2000
ISO 4696-2:1998(E)
Contents
1 Scope .1
2 Normative references .1
3 Principle.1
4 Apparatus .2
5 Test conditions .4
5.1 Composition of reducing gas.4
5.2 Flow rate of reducing gas .4
5.3 Temperature of test .5
6 Sampling and sample preparation .5
7 Procedure .5
7.1 Number of determinations .5
7.2 Test portion .5
7.3 Reduction .5
7.4 Tumbling and sieving.6
8 Expression of results .6
9 Test report .6
10 Verification .7
(normative)
Annex A Repeatability and number of tests .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]
Printed in Switzerland
ii

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

SIST ISO 4696-2:2000
© ISO
ISO 4696-2:1998(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 4696-2 was prepared by Technical Committee ISO/TC 102, Iron ores, Subcommittee
SC 3, Physical testing.
Together with part 1, this part of ISO 4696 cancels and replaces ISO 4696:1984, which has been technically
revised.
ISO 4696 consists of the following parts, under the general title Iron ores — Static test for low-temperature
reduction-disintegration:
—  Part 1: Reaction with CO, CO and H
2 2
—  Part 2: Reaction with CO
Annex A forms an integral part of this part of ISO 4696.
iii

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

SIST ISO 4696-2:2000
© ISO
ISO 4696-2:1998(E)
Introduction
This part of ISO 4696 describes a test method for evaluating the disintegration behaviour of iron ores reduced in a
fixed bed under specific conditions. The specific features of this test are:
a) isothermal reduction in a fixed bed at 550 °C;
b) tumbling the reduced sample at room temperature;
c) measurement of the disintegration of a test portion by sieving after tumbling.
The results of this test should be considered in conjunction with the results of other tests, particularly those showing
the physical behaviour of materials during reduction.
ISO 4696-1 describes an alternative method adopting different test conditions.
iv

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

SIST ISO 4696-2:2000
INTERNATIONAL STANDARD  © ISO ISO 4696-2:1998(E)
Iron ores — Static test for low-temperature reduction-
disintegration —
Part 2:
Reaction with CO
WARNING — This part of ISO 4696 may involve hazardous materials, operations or equipment. It does not
purport to address all the safety problems, if any, associated with its use. It is the responsibility of the user
of this part of ISO 4696 to establish appropriate safety and health practices and to determine the
applicability of any regulatory limitations prior to use.
1 Scope
This part of ISO 4696 specifies a method for testing the disintegration of iron ores by tumbling, at room temperature,
a test portion that has been reduced in a fixed bed at a temperature of 550 °C.
The method is applicable to natural iron ores and to iron ore agglomerates such as pellets or sinter.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of
ISO 4696. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
parties to agreements based on this part of ISO 4696 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 3082:1998, Iron ores — Sampling and sample preparation procedures.
1)
ISO 3310-1:— , Test sieves — Requirements and tests — Part 1: Metal wire cloth sieves.
2)
ISO 3310-2:— , Test sieves — Requirements and tests — Part 2: Perforated metal plate sieves.
3 Principle
A test portion with a specified size range is subjected to static reduction at a temperature of 550 °C using reducing
gas consisting of carbon monoxide (CO) and nitrogen (N ).
2
After 30 min reduction time, the test portion is cooled to a temperature below 100 °C and tumbled by using a small
tumbler drum for 900 revolutions in total. It is then sieved with a test sieve having square mesh apertures of 2,8 mm.
______________
1) To be published. (Revision of ISO 3310-1:1990)
2) To be published. (Revision of ISO 3310-2:1990)
1

---------------------- Page: 7 ----------------------

SIST ISO 4696-2:2000
© ISO
ISO 4696-2:1998(E)
The reduction-disintegration index (RDI-2 ) is calculated as a quantitative measure of the degree of disintegration
–2,8
of an iron ore that has been reduced and then tumbled: the percentage by mass of material less than 2,8 mm is
related to the total mass of the test portion after reduction and before tumbling.
4 Apparatus
The apparatus shall consist of the following:
• a system to supply and regulate the gases;
• a reduction tube;
• an electrically heated furnace to heat the sample to the specified temperature;
• a tumbler drum;
...