ISO 12982-1:2000

INTERNATIONAL ISO
STANDARD 12982-1
First edition
2000-12-15
Carbonaceous materials used in the
production of aluminium — Calcined
coke — Determination of the reactivity to
air —
Part 1:
Ignition temperature method
Produits carbonés utilisés pour la production de l'aluminium — Coke
calciné— Déterminationdelaréactivité àl'air —
Partie 1: Méthode de la température d’inflammabilité
Reference number
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ii ISO 2000 – All rights reserved

Contents Page
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Reagents . 1
5 Apparatus . 2
6 Sampling . 2
7 Preparation of test sample . 5
8 Procedure . 6
9 Calculation and expression of results . 6
10 Precision . 7
11 Test report . 7
Bibliography. 9
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ISO 2000 – All rights reserved iii

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 com-
mittees. 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 liai-
son 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 3.
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 part of ISO 12982 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 12982-1 was prepared by Technical Committee ISO/TC 47, Chemistry, Subcommittee
SC 7, Aluminium oxide, cryolite, aluminium fluoride, sodium fluoride, carbonaceous products for the aluminium in-
dustry.
ISO 12982 consists of the following parts, under the general title Carbonaceous materials used in the production of
aluminium — Calcined coke — Determination of the reactivity to air:
— Part 1: Ignition temperature method
A thermogravimetric method will be the subject of a future part 2 to ISO 12982.
©
iv ISO 2000 – All rights reserved

INTERNATIONAL STANDARD ISO 12982-1:2000(E)
Carbonaceous materials used in the production of aluminium —
Calcined coke — Determination of the reactivity to air —
Part 1:
Ignition temperature method
1 Scope
This part of ISO 12982 describes an ignition temperature method for the determination of the reactivity to air of cal-
�
5 C/min
cined petroleum coke used in the manufacture of anodes for the production of aluminium. A heating rate of
�
is used for petroleum coke specifications, whereas 10 C/min is used for statistical process control of calcination
kilns and for anode butt quality control.
NOTE ISO 12982-2 (in preparation) will give a thermobalance method for the determination of the reactivity to air of calcined
coke.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 12982. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 12982 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated references,
the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of cur-
rently valid International Standards.
ISO 6375, Carbonaceous materials for the production of aluminium — Coke for electrodes — Sampling.
ISO 8723, Carbonaceous materials for the production of aluminium — Calcined coke — Determination of oil
content — Method by solvent extraction.
ISO 12984, Carbonaceous materials used in the production of aluminium — Calcined coke — Determination of par-
ticlesizedistribution.
3 Principle
The reactivity to air of calcined coke is measured by calculation after determining the ignition temperature of a sam-
ple exposed to air, and thus oxygen.
5 g 1 mm 1,4 mm 50 l/h
A coke sample of having a grain size of to is exposed to an air stream of in a furnace heated
� �
at 10 C/min or 0,5 C/min, depending on the sample history and the intended application. Ignition is assumed to oc-
cur at the point where a sudden rise in the sample temperature occurs.
The reactivity to air is calculated using a correlation derived from thermogravimetric measurements made on coke
[1][2]
samples .
4Reagents
4.1 Air, bottled or compressed, containing less than 100 mg/kg free water.
©
ISO 2000 – All rights reserved 1

� �
4.2 Certified calibration standard, having an ignition temperature of about 620C1at a heating rate of0 C/min.
5 Apparatus
Ordinary laboratory apparatus and the following.
� �
5.1 Furnace, capable of heating from 20 C to 1 000C1in less thanh. A vertical, single-zone tube furnace that
ensures a good vertical temperature distribution shall be used. A furnace having suitable dimensions is shown in
Figure 1.
5.2 Tube reactor, consisting of two quartz tubes and a cap,
...