ISO INTERNATIONAL STANDARD 10142 First edition 1996-09-15 Carbonaceous materials for use in the production of aluminium Calcined coke Determination of grain stability using a laboratory vibration mill Produits carbonés utilisés pour la production de I'aluminium Coke calcine -Determination de la stabilite du grain par broyeur abilles oscillant ISO Reference number ISO 10142:1996(E) IS0 10142:1996(E) Foreword ISO(theInternationalOrganizationforStandardization)isaworldwidefed- eration 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 subjcct 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 10142 was prepared by Technical Committee ISO/TC 47, Chemistry, Subcommittee SC 7, A/uminium oxide, cryolite, aluminium fluoride, sodium fluoride, carbonaceous products for the alumi- niumindustry. @ISO1996 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 photocopyingandmicrofilm,without permission in writing from thepublisher International OrganizationforStandardization Case Postale 56 . CH-1211 Geneve 20 . Switzerland Printed in Switzerland ii INTERNATIONALSTANDARD @ISO ISO10142:1996(E) Carbonaceous materials for use in the production of aluminium Calcined coke - Determination of grain stability using a laboratory vibration mill Scope 4 Apparatus Calcined coke with poor mechanical strength may be 4.1 Laboratory vibration mill, having two grinding come degraded during mixing. Poor grain stability will vessels, each filled with 1 kg of clean, hard steel balls, affect the grain size and may result in poor quality of diameter 10 mm ± 0,4 mm. The main features of the baked blocks. mill are shown in figures 1 to 5. This International Standard describes a laboratory vi- The mill (1) and drive motor (9) are mounted on a bration mill method for the determination of the grain common base plate (2). The grinding vessels (7, 8) are stability of calcined coke for the manufacture of car- installed in the body of the mill, which is supported by bon products used in the manufacture of aluminium. four soft, flat springs (4). The spring suspension sys- tem is designed to allow the machine to be operated without any fastenings or anchorage. The grinding 2 Normative references vesselsaresecuredbyadjustablestraps(5)which haveaquick-releasecatch(13).Theoscillatorissup- ported on a bearing (6), fitted to the body of the mill, The following standards contain provisions which. and is driven by the motor (9) via a special clutch (3) through reference in this text, constitute provisions of and a hollow flexible shaft (12). this International Standard. At the time of publication the editions indicatedwere valid.Allstandards are The peak-to-peak amplitude of the vibration shall be subject to revision, and parties to agreements based 4 mm ± 0,5 mm. A reference disc is fitted to the front onthis InternationalStandard areencouraged toin- of the machine to measure the amplitude of vibration. vestigate the possibility of applying the most recent editions of the standards indicated below. Members The motor shall be capable of 1 450 rpm to 1 470 rpm. of IEC and ISO maintain registers of currently valid The bearing housing (11) is rigidly connected to the International Standards