|
International
Standard
ISO 17544
Second edition
Carbonaceous materials used in
2024-08
the production of aluminium —
Cold and tepid ramming pastes —
Determination of rammability of
unbaked pastes
Produits carbonés utilisés pour la production de l'aluminium —
Pâtes de brasquage froides et tièdes — Détermination de
l'aptitude au brasquage des pâtes non cuites
Reference number
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: [email protected]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 Principle . 2
6 Apparatus . 2
7 Sampling . 2
8 Procedure . 3
9 Expression of results . 3
9.1 Calculation of the density .3
9.2 Interpretation of the curve .3
9.3 Determination of N .3
9.3.1 Fitting the data to a Weibull function .3
9.3.2 Calculation of N .4
9.4 Determination of ρ(50)/ρ(100) .4
10 Precision . 4
11 Test report . 5
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 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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 226, Materials for the production of primary
aluminium.
This second edition cancels and replaces the first edition (ISO 17544:2004), which has been technically
revised.
The main changes are as follows:
— the mass of the falling weight and the ramming rate have been corrected.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
The bottom of aluminium electrolysis cells is lined with cathode blocks that are sealed with a ramming
paste to avoid any leakage. When lining a cell, the green paste is directly rammed between the cathode
blocks and baked in situ during the start-up of the pot by the process heat. The quality of the paste is of
primary importance as to ensure long operation without disturbance.
v
International Standard ISO 17544:2024(en)
Carbonaceous materials used in the production of
aluminium — Cold and tepid ramming pastes —
Determination of rammability of unbaked pastes
1 Scope
This document describes a method of producing a compaction curve indicating the rammability of
carbonaceous ramming pastes used to line cathodes utilized in the production of aluminium.
Determination of the rammability enables a ramming paste with the optimum density to be selected.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
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 14422, Carbonaceous materials used in
...