ISO INTERNATIONAL STANDARD 3271 Fifth edition 2015-08-01 Iron ores for blast furnace and direct reduction feedstocks - Determination of the tumble and abrasion indices Minerais de fer pour charges de hauts fourneaux et pour procedes par réduction directe - Détermination des indices de cohésion et d'abrasion Reference number IS0 3271:2015(E) ISO International Organization for Standardization see=Zhejang Institute of Standardization 5956617 @IS02015 vided by IHS under I No reproduction or networking permitted without license from IHS IS0 3271:2015(E) COPYRIGHT PROTECTED DOCUMENT IS0 2015, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form 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 copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Not for Resale, 2015/11/11 08:31:26 etworking permitted without license from IHS IS0 3271:2015(E) Contents Page Foreword .iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Principle ..1 5 Sampling, sample preparation, and preparation of test portions ..1 5.1 Sampling and sample preparation. ..1 5.2 Preparation of test portions. 6 Apparatus .2 6.1 General .2 7 Procedure .3 7.1 Number of determinations for the test 3 7.2 Tumbling 3 7.3 Sieving. 3 8 Expression of results .3 8.1 Calculation of the tumble index (TI) and abrasion index (Al) ..3 8.2 Repeatability and acceptance of test results. .4 9 Test report. ..4 10 Verification ..4 Annex A (normative) Flowsheet of the procedure for the acceptance of test results 6 iii icensee=Zhejiang Institute of Standardization 5956617 thout license from IHS