BS ISO 18843-2015 Aluminium oxide primarily used for the production of aluminium Method for the determination of flow time《主要用于铝生产的氧化铝 流动时间的测定方法》.pdf
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1、BSI Standards PublicationBS ISO 18843:2015Aluminium oxide primarilyused for the production ofaluminium Method for thedetermination of flow timeBS ISO 18843:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 18843:2015.The UK participation in its preparation w
2、as 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 purport to include all the necessaryprovisions of a contract. Users are responsible for its c
3、orrectapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 84997 8ICS 71.100.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strat
4、egy Committee on 30 June 2015.Amendments issued since publicationDate Text affectedBS ISO 18843:2015 ISO 2015Aluminium oxide primarily used for the production of aluminium Method for the determination of flow timeOxyde daluminium principalement utilis pour la production daluminium Mthode de dtermina
5、tion du temps dcoulementINTERNATIONAL STANDARDISO18843First edition2015-06-01Reference numberISO 18843:2015(E)BS ISO 18843:2015ISO 18843:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of th
6、is 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 ISOs member body in t
7、he country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 18843:2015ISO 18843:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Principle 14 Apparatus . 1
8、5 Sample preparation . 16 Procedure. 26.1 General . 26.2 Number of determinations . 26.3 Determination . 27 Reporting of results . 28 Precision . 29 Test report . 3Annex A (informative) Results of planned trial . 5Bibliography 6 ISO 2015 All rights reserved iiiContents PageBS ISO 18843:2015ISO 18843
9、:2015(E)ForewordISO (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 wh
10、ich 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
11、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
12、 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
13、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
14、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 ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary
15、informationThe committee responsible for this document is ISO/TC 226, Materials for the production of primary aluminium.iv ISO 2015 All rights reservedBS ISO 18843:2015ISO 18843:2015(E)IntroductionThis International Standard is based on Australian Standard, AS 2879.9, AluminaDetermination of flow ti
16、me. ISO 2015 All rights reserved vBS ISO 18843:2015BS ISO 18843:2015Aluminium oxide primarily used for the production of aluminium Method for the determination of flow time1 ScopeThis International Standard sets out a method for determining the amount of time taken for a given quantity of smelter-gr
17、ade alumina to flow by gravity through a precisely constructed standard funnel.NOTE Variations in the apparatus and other test variables can create significant inter-laboratory differences in results. (See Table A.1.)2 Normative referencesThe following documents, in whole or in part, are normatively
18、 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.AS 4538.2, Guide to the sampling of alumina Part 2: Preparation of sa
19、mples3 PrincipleThe standard funnel is loaded with a specified mass of alumina. The time for the alumina to flow out of the funnel is determined.4 Apparatus4.1 GeneralThe test may be carried out using manual or automatic timing. An automatic device is shown in Figure 1.4.2 Funnel, precisely construc
20、ted of a corrosion resistant metal, e.g. brass or aluminium, as shown in Figure 2 with an abrasion resistant material, e.g. hardened stainless steel, insert with an outlet diameter of (3,95 to 4,00) mm; this diameter is critical.4.3 Stand, a suitable device for supporting the funnel.4.4 Timing devic
21、e, either a stop watch or automated device capable of an accuracy of 1 s.4.5 Top-loading balance, capable of weighing 100 g to the nearest 0,1 g.4.6 Sieve, with apertures within the range (300 to 400) m to remove abnormal oversize material.4.7 Container, suitable for containing the test sample.4.8 S
22、ealable container, suitable for containing and storing the funnel.5 Sample preparationThe analytical sample shall be conditioned by exposure to the laboratory atmosphere for a minimum of 2 h in a layer of 5 mm maximum thickness. The sample shall then be split as per AS 4538.2 into three INTERNATIONA
23、L STANDARD ISO 18843:2015(E) ISO 2015 All rights reserved 1BS ISO 18843:2015ISO 18843:2015(E)portions of approximately (105 to 120) g for testing. The sample shall then be screened through a sieve (4.6) and the oversize material discarded.6 Procedure6.1 GeneralThis procedure is for manually timed de
24、terminations.6.2 Number of determinationsThree determinations shall be carried out.6.3 DeterminationEach determination shall be carried out as follows.a) Ensure the funnel is clean with no surface oxides present and dry prior to use; otherwise flow times will not be reproducible. Frequent use has us
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