ISO INTERNATIONAL STANDARD 3082 Fifth edition 2017-07 Iron ores Sampling and sample preparation procedures Minerais de fer - Procédures d'échantillonnage et de préparation des échantillons Reference number IS0 3082:2017(E) International Organization for Standardization @ IS0 2017 Not for Resale, 2017/9/2705:19:54 see=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under I No reproduction or networking permitted without license from IHS IS0 3082:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland 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 +41 22 749 09 47 [email protected] www.iso.org Licensee-ZHEJIANG INST OF STANDARDIZAISQ 017 - All rights reserVed Not for Resale, 2017/9/27 05:19:54 networking permited without license from IHS IS0 3082:2017(E) Contents Page Foreword ..vi 1 Scope .1 2 Normative references 3 Terms and definitions .. 4 General considerations for sampling and sample preparation ..4 4.1 Basic requirements. ..4 4.2 Establishing a sampling scheme 4.3 System verification. ..5 5 Fundamentals of sampling and sample preparation. ..6 5.1 Minimization of bias.. 5.1.1 General .6 5.1.2 Minimization of particle size degradation ..6 5.1.3 Extraction of increments. ..6 5.1.4 Increment mass. ..7 5.2 Overall precision ..8 5.3 Quality variation .10 5.4 Sampling precision and number of primary increments ..11 5.4.1 Mass-basis sampling. .11 5.4.2 Time-basis sampling. ..1 5.5 Precision of sample preparation and overall precision .12 5.5.1 General .12 5.5.2 Preparation and measurement of gross sample .13 5.5.3 Preparation and measurement of partial samples. ..13 5.5.4 Preparation and measurement of each increment. ..13 6 Methods of sampling. ..14 6.1 Mass-basis sampling ..14 6.1.1 Mass of increment ..14 6.1.2 Quality variation. .14 6.1.3 Number of primary increments .15 6.1.4 Sampling interval .15 6.1.5 Methods of taking increments. ..15 6.2 Time-basis sampling .15 6.2.1 Mass of increment. ..15 6.2.2 Quality variation. .15 6.2.3 Number of increments ..16 6.2.4 Sampling interval ..16 6.2.5 Methods of taking increments. .16 6.3 Stratified random sampling within fixed mass or time intervals ..16 6.3.1 General. .16 6.3.2 Fixed mass intervals ..17 6.3.3 Fixed time intervals. .17 7 Sampling from moving streams .17 7.1 General ..17 7.2 Safety of operations. ..17 7.3 Robustness of sampling installation ..18 7.4 Versatility of sampling system ..18 7.5 Primary samplers .18 7.5.1 Location ..18 7.5.2 Types of primary sampler ..18 7.5.3 General design criteria for primary cutters .19 7.5.4 Cutter aperture of primary sampler .23 7.5.5 Cutter speed of primary sampler. .23 ii icensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 ted without license from IHS Not for Resale, 2017/9/27 05:19:54 No reproduction or networking permi IS0 3082:2017(E) 7.6 Secondary and subsequent samplers. 24 7.7 Online sample preparation. 24 7.7.1 Arrangement for sample preparation 24 7.7.2 Crushers 24 7.7.3 Dividers. 24 7.7.4 Dryers. .25 7.8 Checking precision and bias 25 7.9 Cleaning and maintenance. .25 7.10 Example of a flowsheet. 28 8 Sampling from stationary situations. 30 8.1 General. 30 8.2 Sampling from trucks and wagons 30 8.2.1 General 30 8.2.2 Sampling devices 30 8.2.3 Number of primary increments. .31 8.2.4 Method of sampling. .31 8.3 Sampling from ships, stockpiles and bunkers .31 9 Stopped-belt reference sampling .31 10 Sample preparation 32 10.1 Fundamentals .32 10.1.1 General .32 10.1.2 Drying. 33 10.1.3 Crushing and grinding. 33 10.1.4 Mixing 33 10.1.5 Division 34 10.1.6 Ma