ISO INTERNATIONAL STANDARD 9276-4 First edition 2001-07-15 Representation of results of particle size analysis- Part 4: Characterization of a classification process Représentation de donnees obtenues par analyse granulometrique- Partie 4: Caracterisation d'un processus de triage Reference number ISO 9276-4:2001(E) ISO @ ISO 2001 HS unde Not for Resale ISO 9276-4:2001(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISo Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by isO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below @ISO2001 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 photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Casepostale56.CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.ch Printed in Switzerland IsO2001-All rightsreserved itted without license from IHS Not for Resale ISO 9276-4:2001(E) Contents Page Foreword. .iv Introduction 1 Scope 2 Symbols.. 2.1 Symbols for specific terms. 2.2 Subscripts .... 3 3 Characterization of a classification process based on error-free distribution curves and mass balances.. 3.1 Density distribution curves representing a classification process... 3.2 Massandnumberbalances...... 3.3 Definitions of cut size, Xe ... 5 3.4 Grade efficiency, T, the grade efficiency curve, T(x), (Tromp's curve).. .6 3.5 Measures of sharpness of cut.. 4 The influence of systematic errors on the determination of grade efficiency curve. 4.1 General... 4.2 Systematic error due to a splitting process in the classifier 10 4.3 Incomplete dispersion of the feed material .... 4.4 The influence of comminution of the feed in the classifier Annex A (informative) The influence of stochastic errors on the evaluation of grade efficiency curves.... 12 Bibliography 17 ili HS unde from IHS Not for Resa