ISO INTERNATIONAL STANDARD 310 Third edition 1992-11-01 Manganese ores and concentrates - Determination of hygroscopic moisture content in analytical samples - Gravimetric method Minerais et concentres de manganese - Determination de I'humidite hygroscopique dans les échantillons pour analyse --- Methode gravimetrique Reference number ISO310:1992(E) Not for Resale orking permitted without license from IHS ISO 310:1992(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, governmental and non-govemmental, 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. circulated to the member bodies for voting. Publication as an International a vote. ISO/Tc 65, Manganese and chromium ores. This third edition cancelsandreplacesthe second edition (IsO 310:1981), of which it constitutes a technical revision. Annex A of this International Standard is for information only. ISO1992 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 per- mission in writing from the publisher. International Organization for Standardization Case Postale 56 : CH-1211 Genove 20 : Switzerland Printed in Switzerland ii Not for Resale ithout license from IHS ISO 310:1992(E) INTERNATIONAL STANDARD Manganese ores and concentrates Determination of hygroscopic moisture content in analytical samples ---- Gravimetric method Scope 3Principle This International Standard specifies a gravimetric Drying of an air-dried test portion to constant mass in method for the determination of the hygroscopic moisture content of manganese ores and concen- ment of the loss in mass. trates. The method is applicable to products having hygroscopic moisture contents from 0,1 % (m/m) and 10 % (m/m). Apparatus 4. The determination of the hygroscopic moisture con- Ordinary laboratory apparatus, and tent is intended to be carried out simultaneously with the determination of other constituents of the same analytical sample, so that the contents of the other Weighing bottle, with stopper. 4.1 constituents can be calculated on the basis of the absolutely dry ore. This International Standard should be read in con- 4.2 Laboratory oven, with a thermoregulator. junction with ISO 4297. Desiccator, filled with melted calcium chloride, 4.3 calcinated at 700 °C to 800 °C. Normative references 2 Sampling and samples The following standards contain provisions which, through reference in this text, constitute provisions For analysis, use a laboratory sample of minus of this International Standard. At the time of publica- 100 μm particle size, which has been taken in ac- tion, the editions indicated were valid. All standards cordance with ISO 4296-1 and prepared in accordance are subject to revision, and parties to agreements with iSO 4296-2. based on this International Standard are encouraged to investigate the possibility of applying the most re- The sample shall be air-dried under laboratory con- cent editions of 'the standards indicated below. ditions. Members of IEC and ISO maintain registers of cur- rently valid International Standards. IsO 4296-1:1984, Manganese ores — Sampling 6 Procedure Part 1: Increment sampling. Iso 4296-2:1983, Manganese ores — Sampling - 6.1 Test portion Part 2: Preparation of samples. Weigh, to the nearest 0,001 g, the test sample cho- 1sO 4297:1978, Manganese ores and concentrates sen from table 1, in accordance with the expected Methods of chemical analysis G