1、BSI Standards PublicationBS ISO 10143:2014Carbonaceous materials for theproduction of aluminium Calcined coke for electrodes Determination of the electricalresistivity of granulesBS ISO 10143:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 10143:2014. Itsu
2、persedes BS 6043-2.10:1996 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/24, Raw materials for the aluminium industry.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purpor
3、t to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 81218 7ICS 71.100.10Compliance with a British Standard cannot confer immunity fromlegal obligations.T
4、his British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2014.Amendments issued since publicationDate Text affectedBS ISO 10143:2014 ISO 2014Carbonaceous materials for the production of aluminium Calcined coke for electrodes Determination of the
5、 electrical resistivity of granulesProduits carbons utiliss pour la production de laluminium Coke calcin Dtermination de la rsistivit lectrique granulaireINTERNATIONAL STANDARDISO10143Second edition2014-06-15Reference numberISO 10143:2014(E)BS ISO 10143:2014ISO 10143:2014(E)ii ISO 2014 All rights re
6、servedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All 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 writ
7、ten permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 10
8、143:2014ISO 10143:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Principle 14 Apparatus . 15 Sampling and sample preparation 35.1 Sampling . 35.2 Sample preparation calcined petroleum coke . 35.3 Sample preparation all samples . 36 Procedure. 36.
9、1 Test portion 36.2 Setting up the test machine 36.3 Determination . 46.4 Number of determinations . 47 Expression of results 48 Precision . 48.1 Repeatability . 48.2 Reproducibility . 49 Test report . 4BS ISO 10143:2014ISO 10143:2014(E)ForewordISO (the International Organization for Standardization
10、) 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 repr
11、esented 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 deve
12、lop 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
13、/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
14、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 meanin
15、g of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 226, M
16、aterials for the production of primary aluminium.This second edition cancels and replaces the first edition (ISO 10143:1995), which has been technically revised.iv ISO 2014 All rights reservedBS ISO 10143:2014INTERNATIONAL STANDARD ISO 10143:2014(E)Carbonaceous materials for the production of alumin
17、ium Calcined coke for electrodes Determination of the electrical resistivity of granules1 ScopeThis International Standard specifies a method for the determination of the electrical resistivity of granular carbon (calcined or graphitized) used in the manufacture of carbon electrodes for the producti
18、on of aluminium.The measurement of electrical resistivity assists in assessing the extent of coke calcination. The electrical resistivity of the coke aggregate will influence that of the coke electrodes made from it.In general, a more highly calcined coke will have a lower electrical resistivity if
19、other factors, such as grain size, are similar.2 Normative referencesThe 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 o
20、f the referenced document (including any amendments) applies.ISO 6375, Carbonaceous materials for the production of aluminium Coke for electrodes SamplingISO 6997, Carbonaceous materials for the production of aluminium Calcined coke Determination of apparent oil content Heating methodISO 8723, Carbo
21、naceous materials for the production of aluminium Calcined coke Determination of oil content Method by solvent extractionISO 11412, Carbonaceous materials for the production of aluminium Calcined coke Determination of water content3 PrincipleA test portion of the granular carbon is placed in a cylin
22、drical holder which has electrical contacts at the top and bottom. A fixed pressure is applied to the test portion to ensure good electrical contact and a fixed, constant direct current is applied. The voltage drop and the height of the column of granules are measured and the electrical resistivity
23、is calculated.4 ApparatusOrdinary laboratory apparatus, plus the following:4.1 Sample holder and plunger, with removable base for cleaning as shown in Figure 1.4.2 Length-measuring device, capable of measuring the movement of the compression plunger to 0,02 mm.4.3 Brass reference cylinder, having a
24、height of 20 mm 0,01 mm and a diameter of 29 mm, used for calibrating the length-measuring device (4.2). ISO 2014 All rights reserved 1BS ISO 10143:2014ISO 10143:2014(E)4.4 Test machine, capable of applying a constant pressure of 3 MPa 1 % to the plunger (4.1). Giving a velocity to the plunger of no
25、t more than 50 mm/s and having a centering device for the sample holder (4.1).4.5 Power supply, capable of providing a constant direct current of 1 A 0,002 A.4.6 Voltmeter, capable of measuring to the nearest 0,01 mV.4.7 Oven, capable of being maintained at 120 C 2 C.Dimensions in millimetresKey1 po
26、wer supply2 PTFE3 brass4 agate5 hard-chromed surfaces6 stainless steel7 plunger8 mouldFigure 1 Sample holder and plunger, showing electrical connections2 ISO 2014 All rights reservedBS ISO 10143:2014ISO 10143:2014(E)5 Sampling and sample preparation5.1 SamplingSample the coke in accordance with ISO
27、6375.5.2 Sample preparation calcined petroleum cokeHeat the sample to 110 C 5 C during 12 h, using the oven (4.7) in compliance with ISO 11412.De-oil the sample by washing with dichloromethane in accordance with ISO 8723 or by heating in accordance with ISO 6997.Crush all the sample material 1,4 mm
28、in a jaw crusher with a minimum aperture of 1,5 mm so that all the sample material passes the 1,4 mm sieve.Sieve the fraction 1,4 mm to 1,0 mm for the analysis.5.3 Sample preparation all samplesDivide the sample, by sieving, into three fractions (I, lla, and Ill) as follows: fraction l 1,0 mm; fract
29、ion lla 0,5 mm to 1,0 mm; fraction Ill 0,5 mm.Crush fraction l so that it is predominantly 0,5 mm to 1,0 mm and sieve to form fraction llb.Mix fractions lla and llb thoroughly.Wash the sample with dichloromethane in accordance with ISO 8723.Heat the sample to 120 C 2 C for 30 min using the oven (4.7
30、), allow to cool in a desiccator and weigh to the nearest 1 g or better. Repeat the operations of heating, cooling, and weighing until the difference between two successive weightings does not exceed 1 % of the original sample mass.6 Procedure6.1 Test portionWeigh out 15 g 0,1 g of the mixture of fr
31、action 1,4 mm to 1,0 mm or of lla and llb (5.3).6.2 Setting up the test machinePlace the brass reference cylinder (4.3) in the sample holder (4.1).Place the sample holder with plunger (4.1) in the test machine (4.4) and apply a pressure of 3 MPa. Set the length-measuring device (4.2) to the referenc
32、e level of 20 mm. Connect up the electrical wires and switch on the power supply (4.5).Place the sample holder with plunger (4.1) in the test machine (4.4) and apply a pressure of 3 MPa. Set the length-measuring device (4.2) to the reference level of 20 mm. Connect up the electrical wires and switch
33、 on the power supply (4.5). ISO 2014 All rights reserved 3BS ISO 10143:2014ISO 10143:2014(E)6.3 DeterminationPour the test portion into the sample holder, insert the plunger and place the assembly in the test machine.Apply a pressure of 3 MPa to the test portion and after 30 s record the voltage dro
34、p and the height of the column of granules.6.4 Number of determinationsCarry out two determinations using a fresh test portion for each determination.Clean the base and the plunger surfaces carefully after each determination.7 Expression of resultsCalculate the electrical resistivity, , expressed in
35、 microohm metres, of the calcined coke using Formula (1): =SUIh(1)whereS is the surface area, in square millimetres, of the sample holder (707 mm2for the sample holder shown in Figure 1);U is the voltage drop, in millivolts;I is the current applied, in amps (1 A 0,002 A);h is the height, in millimet
36、res, of the column of granules.Express the result as the arithmetic mean of two determinations.8 Precision1)8.1 RepeatabilityThe difference between the values of duplicate determinations, carried out in rapid succession by the same operator using the same apparatus on granules taken from the same te
37、st sample, shall not exceed the repeatability limit r = 3 %.8.2 ReproducibilityThe difference between the values of the average of duplicate determinations obtained by two laboratories using this method for the analysis of the same laboratory sample is not expected to exceed the reproducibility limi
38、t R = 5 %.9 Test reportThe test report shall include the following information:a) all details necessary for complete identification of the sample;1) ISO 5725:1986, Precision of test methods Determination of repeatability and reproducibility for a standard test method by inter-laboratory tests (now w
39、ithdrawn), was used to obtain the precision data.4 ISO 2014 All rights reservedBS ISO 10143:2014ISO 10143:2014(E)b) a reference to this International Standard (i.e. ISO 10143);c) the size distribution of the grain fraction used;d) the results, expressed in accordance with Clause 7;e) the details of
40、any unusual features noted during the determination;f) the details of any operation not included in this International Standard or in the International Standards to which reference is made, as well as any operation regarded as optional. ISO 2014 All rights reserved 5BS ISO 10143:2014ISO 10143:2014(E
41、) ISO 2014 All rights reservedICS 71.100.10Price based on 5 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter. British Standards and other
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