ISO INTERNATIONAL STANDARD 8833 First edition 1989-11-15 Magnetitefor use in coal preparation Test methods Magnetite a utiliser dans la preparation des charbons - Methodes d'essai Reference number ISO 8833 : 1989 (E) Copyright International Organization for Standardization No reproduction or networking permited without license from IHS Not for Resale ISO8833: 1989 (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, govern- mental and non-governmental, in liaison with ISo, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all mattersofeiectrotechnicalstandardization. the member bodies for approval before their acceptance as International Standards by least 75 % approval by the member bodies voting. International Standard iSO 8833 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels. ? ISO 1989 All rights reserved. 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 OrganizationforStandardization Case postale 56 . CH-1211 Geneve 20 : Switzerland Printed in Switzerland i CopyrightltematinalOrganizatin for Standardization No reproduction or networking permited without license from IHS Not for Resale ISO8833:1989 (E) Introduction Thebasic requirementsforamaterial to be used in dense mediumsuspensionarethat it should be inert, have a high relative density and be easy to recover. In coal prep- aration, the mineral magnetite (FeO, Fe2O3) has become the most commonly used material, not only because it fulfils all the above criteria, but also because of its worldwide occurrence eitheras an iron ore or as a by-product of mining operations for other minerals. Like any mineral, magnetite rarely occurs in the pure state and the presence of gangue minerals may lower the relative density and affect the fer- romagnetic properties. In addition, like other minerals in the spinet group, there may be substitution of either or both the divalent and/or trivalent ions by ions of other metals (e.g. Mg2+, Mn2+, A13+, Cr3+, Mn3+). These variations may seriously affect the effi- ciency of recovery operations and it is important when designing a coal preparation plant that the manufacturer of the magnetic separators be informed of the source of magnetite to be used and if possible be provided with a sample. The purpose of this International Standard is to provide a basis for the testing of magnetite for use in coal preparation. It is intended for use by contracting parties in the design and quality control fields The tests specified in this International Standard will assist the user in the selection of magnetite for use in dense medium suspension and provide a basis for quality control cations. The specified tests should ensure that the properties which make magnetite suitable for coal preparation purposes are simply and adequately tested. These properties are moisture content; b) particle size distribution; c) total magnetics content; d) relative density; (0 total iron content; f) iron(ll)content g) fundamental magnetic properties. All the above tests may be required for the assessment of magnetite from a new source, but for routine checking of regular supplies, moisture, particle size distribution, total magnetics content and relative density should be sufficient. Tests for fundamental magnetic properties are not described because the determi- probably best undertaken by a University or Research Institute whose staff are exper- ienced in making such me