ISO INTERNATIONAL STANDARD 7215 Fourth edition 2015-08-15 Iron ores for blast furnace feedstocks Determination of the reducibility by the final degree of reduction index Minerais deferpourcharges dehauts fourneaux-Détermination de la réductibilité relative par le degre final de I'indice de réduction Reference number ISO 7215:2015(E) SO International Organization for Standardization @ IS0 2015 Institute of Sta dardization 5956617 vided by IHS under itted without license from IHS IS0 7215:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS02015,PublishedinSwitzerland All rights reserved. Unless otherwise specified, 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 Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel.+41 22 749 01 11 Fax+412274909 47 copyright@iso.org www.iso.org Intenationai br PrganizationforStandardization I by IHS unde etworking permitted without license from IHS IS0 7215:2015(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 5.1 Sampling and sample preparation ..1 5.2 Preparation of test portions. ..2 6 Apparatus .2 6.1 General. .2 7 Test conditions .3 7.1 General. .3 7.2 Reducing gas. 3 7.2.1 .3 Composition 7.2.2 Purity 3 7.2.3 Flow rate .3 7.3 Heating and cooling gas .3 7.4 Temperature of the test portion .3 8 Procedure .3 8.1 Number of determinations for the test .3 8.2 Chemical analysis. ..4 8.3 Reduction. .4 9 Expression of results .5 9.1 Calculation of the degree of reduction (R180) ..5 9.2 Repeatability for R18o and acceptance of test results ..5 10 Test report 11 Verification .6 Annex A (normative) Flowsheet of the procedure for the acceptance of test results .9 Annex B (informative) Derivation of the formula for final degree of reduction ..10 iii vided by IHS under ithout license from IHS