ISO 12981-1:2000

INTERNATIONAL ISO
STANDARD 12981-1
First edition
2000-11-01
Carbonaceous materials used in the
production of aluminium — Calcined
coke — Determination of the reactivity
to carbon dioxide —
Part 1:
Loss in mass method
Produits carbonés utilisés pour la production de l'aluminium —
Coke calciné — Détermination de la réactivité au dioxyde de carbone —
Partie 1: Méthode par perte de masse
Reference number
©
ISO 2000
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ii © ISO 2000 – All rights reserved

Contents Page
Foreword.iv
Introduction.v
1 Scope .1
2 Normative references .1
3 Principle.1
4 Reagent.1
5 Apparatus .2
6 Sampling.5
7 Preparation of test sample.6
8 Procedure .6
9 Expression of results .7
10 Precision.7
11 Test report .7
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 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 12981 may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 12981-1 was prepared by Technical Committee ISO/TC 47, Chemistry, Subcommittee
SC 7, Aluminium oxide, cryolite, aluminium fluoride, sodium fluoride, carbonaceous products for the aluminium
industry.
ISO 12981 consists of the following parts, under the general title Carbonaceous materials used in the production of
aluminium — Calcined coke — Determination of the reactivity to carbon dioxide:
� Part 1: Loss in mass method
� Part 2: Thermogravimetric method
iv © ISO 2000 – All rights reserved

Introduction
The reactivity of a calcined coke to carbon dioxide is assessed by determining the loss in mass of a sample
exposed in accordance with the following chemical reaction:
C� CO �2CO
This determination allows an assessment of the later anode reactivity to carbon dioxide in the electrolysis cell.
INTERNATIONAL STANDARD ISO 12981-1:2000(E)
Carbonaceous materials used in the production of aluminium —
Calcined coke — Determination of the reactivity to carbon
dioxide —
Part 1:
Loss in mass method
1 Scope
This part of ISO 12981 specifies a method for the determination, by a loss in mass method, of the reactivity of
calcined petroleum coke, used in the manufacture of anodes for the production of aluminium, to carbon dioxide.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 12981. 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 12981 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 currently valid International Standards.
ISO 383, Laboratory glassware — Interchangeable conical ground joints.
ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method for
the determination of repeatability and reproducibility of a standard measurement method.
ISO 6375, Carbonaceous materials for the production of aluminium — Coke for electrodes — Sampling.
ISO 8723, Carbonaceous materials for the production of a
...