ISO INTERNATIONAL STANDARD 2598-1 Firstedition 1992-12-15 Iron ores Determination of silicon content -- Part 1: Gravimetric methods Mineraisdefer--Dosagedusilicium Partie 1:Methodes gravimetriques Reference number ISO2598-1:1992(E) ternational Organization for Standardizatior e with ISO No reproduction or networking permited without license from IHS Not for Resale ISO 2598-1:1992(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, aiso take part in the work.Io collaborates closely with the International Electrotechnical Commission (IEC) on ail matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard Iso 2598-1 was prepared by Technical Committee IsO/Tc 102, Iron ores, Sub-Committee $c 2, Chemical analysis. This part of IsO 2598 cancels and replaces isO 2598:1980, of which it constitutes atechnical revision. Iso 2598 consists of the following parts, under the general title Iron ores --- Determination of silicon content: Part1:Gravimetricmethods - Part 2:Reduced molybdosilicate spectrophotometric method Annex A forms an integral part of this part of IsO 2598. Annexes B and C are for information only. ISO 1992 All rights reserved. No part of thls publicatlon may be reproduced or utlized In any form or by any means, electronic or mechanical, including photocopying and microfim, without permission in writing from the publisher. International Organization for Standardization CasePostale56·CH-1211Geneve20·Switzerland Printed InSwitzeriand Internatic No reproduction or networking permited without icense from IHS Not fr Resale ISO2598-1:1992(E) INTERNATIONAL STANDARD ron ores -- Determination of silicon content Part 1: Gravimetric methods 1 Scope iso 648:1977, Laboratory glassware One-mark pipettes. This part of Iso 2598 specifies two gravimetric methods for the determination of the silicon content iso1042:1983,Laboratory glassware - One-mark volumetric flasks. of iron ores. These methods are applicable, with certain limita- ISO 2596:1984, Ironores Determination of tions, to silicon contents between 1 % (m/m) and hygroscopic moisture in analytical samples 15 % (m/m) in natural iron ores, iron ore concen- Gravimetric and Karl Fischer methods. tratesand agglomerates,including sinterproducts. iso 3081:1986, Iron ores -- Increment sampling Method 1 is not applicable to iron ores having a Manual method. content of reducing agents greater than 2 % (m/m). for instance pyrite, or to ores having a fluorine con- Iso 3082:1987, Iron ores - Increment sampling and tent greater than o,1 % (m/m). It is recommended sample preparation - Mechanical method. for lower grade ores having a high content of am- photeric elements. Iso 3083:1986,Iron ores - Preparation of samples --- Manual method. Method 2 can be used for ores having a fluorine content greater than 0,1 % (m/m). t isrec- Iso7764:1985,Iron ores--- Preparation ofpredried ommended for high grade ores having a low content test samples for chemical analysis. of gangue. NOTE1 For ores having a silicon content less than 5 % (m/m), the method specified in Iso 2598-2: -1), Iron ores - Determination of silicon content - Part 2: Reduced 3 Principle molybdosilicate spectrophotometric method, is preferable. Decomposition of the test portion, by either method 1 or method 2. 2 Normative references Method 1: Decomposition by sintering with sodium The f