ISO INTERNATIONAL STANDARD 4701 Fifth edition 2019-04 Iron ores and direct reduced iron - Determination of size distribution by sieving Minerais de fer et minerais de fer préréduits - Détermination de la granulométrie partamisage Reference number IS0 4701:2019(E) [so @ IS0 2019 IS0 4701:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 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 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland i @ IS0 2019 - All rights reserved IS0 4701:2019(E) Contents Page Foreword ..V 1 Scope 2 Normative references ..1 3 Terms and definitions 4 Principles and planning. .2 4.1 General. .2 4.2 Purpose of the analysis. 4.3 Impact of ore and DRI properties 2 4.3.1 .2 Effectofmoisturecontent 4.3.2 Degradation of material. 3 4.3.3 Magnetic ores. .3 4.4 Nature of sample. 4 4.5 Choice of sieving method. .4 4.6 Maximum particle size permitted on a sieve .4 4.7 Specified loading of sieves. .5 4.7.1 General .5 4.7.2 Batch sieving with a single sieve or nest of sieves. .5 4.7.3 Loading of continuous sieving machines. ..6 4.8 Sieving time .6 4.8.1 General .. 6 4.8.2 End point ruling. 7 4.8.3 Retention time for continuous sieving machines .7 5 Apparatus ..7 5.1 Sieve media 7 5.1.1 Shape of aperture. ..7 5.1.2 Size of aperture .7 5.1.3 Construction of sieve media .7 5.1.4 Sieve frames for hand or mechanical nest sieving. 5.2 Sieving machines. ..8 5.3 Accessories for wet sieving 5.4 Drying equipment 9 5.5 Equipment for the determination of mass ..9 6 Samples .10 6.1 Derivation of size sample .10 6.2 Mass of test sample(s) for sieving ..10 6.2.1 General. ..10 6.2.2 Minimum mass. ..10 7 Procedures ..11 7.1 Drying. .11 7.2 Division .11 7.3 Preparation and maintenance of sieves for test or nest sieving ..11 7.4 Sieving ..12 7.4.1 General. ..12 7.4.2 Hand placing on individual sieves .12 7.4.3 Hand sieving in the -40 mm to +1 mm range. 7.4.4 Hand sieving in the -1 mm range ..13 7.4.5 Mechanical batch sieving. ..14 7.4.6 Wet sieving of coarse and fine samples. ..14 7.4.7 Continuous machine sieving... .. 15 7.5 Determination of mass ..15 7.5.1 General. .15 7.5.2 Wet sieving -] Determination of mass of solids-content in washings ..16 @ IS0 2019 - All rights reserved ii