# BS ISO 13543-2016

BS ISO 13543:2016 Copper, lead, zinc and nickel sulfide concentrates — Determination of mass of contained metal in a lot BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 13543:2016 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 13543:2016. The UK participation in its preparation was entrusted to Technical Committee NFE/36, Copper lead and zinc ores and concentrates. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. © The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 81812 7 ICS 73.060.99 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2016. Amendments/corrigenda issued since publication Date T e x t a f f e c t e dBS ISO 13543:2016 © ISO 2016 Copper, lead, zinc and nickel sulfide concentrates — Determination of mass of contained metal in a lot Concentrés sulfurés de cuivre, de plomb, de zinc et de nickel — Détermination de la masse de métal contenu dans un lot INTERNATIONAL STANDARD ISO 13543 Second edition 2016-06-01 Reference number ISO 13543:2016(E)BS ISO 13543:2016ISO 13543:2016(E)ii © ISO 2016 – All rights reserved COPYRIGHT PROTECTED DOCUMENT © ISO 2016, 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 copyright@iso.org www.iso.orgBS ISO 13543:2016ISO 13543:2016(E)Foreword iv 1 Scope . 1 2 Normative references 1 3 Terms and definitions . 1 4 Determination of mass of contained metal . 2 4.1 General . 2 4.2 Wet mass of the lot 2 4.3 Metal content of the lot 2 4.4 Dry mass of the lot . 2 4.5 Mass of contained metal . 2 4.5.1 Major elements 2 4.5.2 Precious metals . 3 5 Determination of variance of mass of contained metal . 3 6 Examples of calculation of contained metal and its variance 4 6.1 Static scale . 4 6.1.1 General 4 6.1.2 Mass of contained copper 4 6.1.3 Mass of contained gold . 5 6.2 Draft survey . 6 Bibliography 8 © ISO 2016 – All rights reserved iii Contents PageBS ISO 13543:2016ISO 13543:2016(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information. The committee responsible for this document is ISO/TC 183, Copper, lead, zinc and nickel ores and concentrates. This second edition cancels and replaces the first edition (ISO 13543:1996), which has been technically revised.iv © ISO 2016 – All rights reservedBS ISO 13543:2016INTERNATIONAL ST ANDARD ISO 13543:2016(E) Copper, lead, zinc and nickel sulfide concentrates — Determination of mass of contained metal in a lot WARNING — This International Standard may involve hazardous materials, operations and equipment. It is responsibility of the user of this International Standard to establish appropriate health and safety practices and determine the applicability of regulatory limitations prior to use. 1 Scope This International Standard specifies the method for determining the mass of contained metal in a lot, based on the wet mass, moisture content and dry basis metal content of the lot. The procedure for estimating the variance and confidence intervals for the mass of contained metal is also specified. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 10251, Copper, lead, zinc and nickel concentrates — Determination of mass loss of bulk material on drying ISO 12743, Copper, lead, zinc and nickel concentrates — Sampling procedures for determination of metal and moisture content ISO 12744, Copper, lead, zinc and nickel concentrates — Experimental methods for checking the precision of sampling ISO 12745, Copper, lead and zinc ores and concentrates — Precision and bias of mass measurement techniques 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 lot quantity of concentrate to be sampled 3.2 wet mass of the lot combined mass of concentrate and moisture of the lot at the time of weighing and sampling 3.3 moisture determination quantitative measurement of the mass loss of the moisture test portion under the conditions of drying specified in ISO 10251 3.4 chemical analysis quantitative determination of the required chemical constituents of the analysis test portion 3.5 precision measure of the random variations within a set of measurements © ISO 2016 – All rights reserved 1BS ISO 13543:2016ISO 13543:2016(E) 3.6 dry mass of the lot mass of concentrate in the lot after correcting for the mass of moisture in the lot 4 Determination of mass of contained metal 4.1 General The mass of contained metal in a lot is determined from measurements of the wet mass, moisture content and dry basis metal content. 4.2 Wet mass of the lot The wet mass of the lot shall be determined using static scales, belt scales or draft surveys. However, due to their superior precision, static scales are recommended. 4.3 Metal content of the lot Samples for chemical analysis shall be collected in accordance with ISO 12743 and analysed in accordance with the relevant ISO chemical analysis standards. 4.4 Dry mass of the lot Calculate the dry mass of the lot using Formula (1): (1) wherem D is the dry mass of the lot, in tonnes;m W is the wet mass of the lot, in tonnes;M is the moisture content of the lot, in percent of the wet mass (mass fraction). 4.5 Mass of contained metal 4.5.1 Major elements For the major elements copper, lead, zinc, and nickel, the mass of contained metal in the lot is given by Formula (2): = (2) wherem M is the mass of contained metal in the lot, in tonnes;m D is the dry mass of the lot, in tonnes;a L is the metal content of the lot on a dry basis, in percent (mass fraction).2 © ISO 2016 – All rights reservedBS ISO 13543:2016ISO 13543:2016(E) Alternatively, Formula (2) may be rewritten as Formula (3): = (3) where F is the moisture factor given by Formula (4): (4) 4.5.2 Precious metals For the precious metals silver and gold, the mass of contained metal in the lot is given by Formula (5): = (5) wherem M is the mass of contained metal in the lot, in kilograms;m W is the wet mass of the lot, in tonnes;F is the moisture factor;a L is the precious metal content of the lot on a dry basis, in grams per tonne (mass fraction). 5 Determination of variance of mass of contained metal The variance of the mass of contained metal in the lot may be determined from Formula (3) by taking the partial derivatives with respect to the wet mass, the moisture factor and the metal content of the lot as given in Formula (6): (6) wheres is the estimated variance of the mass of contained metal in the lot;s is the estimated variance of the wet mass of the lot;s is the estimated total variance of the moisture factor = (s H /100) 2with s Hbeing the total precision (one standard deviation) of moisture determination;s is the estimated total variance of the metal content of the lot. NOTE The estimated total variances of the moisture factor and the metal content include the contributions from primary sampling, sample processing and analysis.© ISO 2016 – All rights reserved 3BS ISO 13543:2016ISO 13543:2016(E) Determining the partial derivatives and substituting them into Formula (6) gives Formula (7): (7) Formula (7) may be simplified as Formula (8): (8) Formula (8) is applicable to both the major elements and the precious metals. The variance of the wet mass of the lot shall be determined in accordance with the procedures specified in ISO 12745 for estimating the precision of mass measurement techniques. The variances of the moisture factor and the metal content of the lot shall be determined according to the procedures specified in ISO 12744. The analyses shall be carried out according to the methods prescribed in relevant International Standards. 6 Examples of calculation of contained metal and its variance 6.1 Static scale 6.1.1 General Assume a 500 t lot containing a mass fraction of 30 % copper, a mass fraction of 10 g of gold/t and a mass fraction of 8 % moisture is weighed using a static hopper scale with a capacity of 25 t, i.e. 20 hopper loads. The precision (one standard deviation) of the hopper scale is 0,1 % relative. The lot is divided into 10 sub-lots and a single moisture determination is carried out on each subsample. A single lot sample is constituted for chemical analysis. The total precisions of the copper, gold and moisture determinations (one standard deviation) are mass fractions of 0,05 % copper, 0,5 g of gold/t and 0,1 % moisture absolute, respectively. 6.1.2 Mass of contained copper m W= 500 t s , , F , s , , a L= 30 % copper4 © ISO 2016 – All rights reservedBS ISO 13543:2016ISO 13543:2016(E) s = (0,05) 2= 0,002 5 Formulae (3) and (8) give m , s ,, , , ,,, ,, , , Calculation of the standard deviation s Mgives s M= 0,24 t copper Hence, at the 95 % confidence level (i.e. two standard deviations), the mass of contained copper metal is m M= 138 ± 0,5 t copper (i.e. ±0,4 % relative) The 95 % confidence range is 137,5 t of copper to 138,5 t of copper. The precision of the measured copper content of the lot is the major contributor to the uncertainty in the mass of contained metal. The uncertainty can be reduced by carrying out additional analyses on the lot sample, or, in future, by analysing each sub-lot separately. 6.1.3 Mass of contained gold m W= 500 t s , , F , s , , a L= 10 g of gold/t s ,, Formulae (5) and (8) give m , ,© ISO 2016 – All rights reserved 5BS ISO 13543:2016ISO 13543:2016(E) s , ,, , , ,, ,, ,,, , , Calculation of the standard deviation s Mgives s M= 0,23 kg gold Hence, at the 95 % confidence level, the mass of contained gold is m M= 4,6 ± 0,5 kg gold (i.e. ±11 % relative) The 95 % confidence range is 4,1 kg of gold to 5,1 kg of gold. The precision of the measured gold content of the lot is the major contributor to the uncertainty in the mass of contained metal. Once again, the uncertainty can be reduced by carrying out additional analyses on the lot sample, or, in future, by analysing each sub-lot separately. 6.2 Draft survey Assume a lot containing a mass fraction of 30 % copper and 8 % moisture has a wet mass of 25 000 t. If the wet mass is determined by draft survey with a relative precision (one standard deviation) of 1 % and the copper and moisture content of the lot have been determined with total precisions (one standard deviation) of mass fractions of 0,05 % copper and 0,1 % moisture absolute respectively, then m W= 25 000 t s F , s , , a L= 30 % copper s ,, Hence, Formulae (3) and (8) give m ,6 © ISO 2016 – All rights reservedBS ISO 13543:2016ISO 13543:2016(E) s , , , ,, , Calculation of the standard deviation s Mgives s M= 70 t copper Hence, at the 95 % confidence level, the mass of contained copper metal is m M= 6 900 ± 140 t copper (i.e. ±2,0 % relative) The 95 % confidence range is 6 760 t of copper to 7 040 t of copper. Clearly, the precision of mass determination is the major contributor to the uncertainty in the mass of