BS ISO 7764-2006 Iron ores - Preparation of predried test samples for chemical analysis《铁矿石 化学分析用预干燥试样的制备》.pdf

1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58chemical analysisICS 73.060.10Iron ores Preparation of predried test samples for BRITISH STANDARDBS

2、 ISO 7764:2006BS ISO 7764:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2006 BSI 2006ISBN 0 580 48388 6Cross-referencesThe British Standards which implement international publications referred to in this document may be found in

3、the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible

4、 for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 and 2, an inside back cover and a back

5、cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can be obtained on request to its secretary. present to the responsible international/E

6、uropean committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard reproduces verbatim ISO 7764:2006 and implements it as the UK n

7、ational standard. It supersedes BS 7020-1:1988 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee ISE/58, Iron ores, which has the responsibility to: aid enquirers to understand the text;Reference numberISO 7764:2006(E)INTERNATIONAL STANDARD ISO7764Second

8、 edition2006-05-01Iron ores Preparation of predried test samples for chemical analysis BS ISO 7764:2006ii iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is

9、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

10、in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to pre

11、pare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that

12、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. ISO 7764 was prepared by Technical Committee ISO/TC 102, Iron ore and direct reduced iron, Subcommittee SC 2, Chemical analysis. This second edi

13、tion cancels and replaces the first edition (ISO 7764:1985), which has been technically revised. BS ISO 7764:2006blank1Iron ores Preparation of predried test samples for chemical analysis 1 Scope This International Standard specifies a method for the preparation of predried test samples of natural i

14、ron ores, and iron ore concentrates and agglomerates, including sinter products, which are to be used for the determination of analytical values of constituents on a dry basis. The method is not applicable to the following types of ores: a) processed ores containing metallic iron (direct-reduced iro

15、n); b) natural or processed ores in which the mass fraction of sulfur is higher than 0,2 %; c) natural or processed ores in which the content of combined water is higher than 2,5 % by mass. NOTE 1 Alternatively, the loss on ignition may be determined as an estimate of the combined water content. Whe

16、re this method is not applicable, ISO 2596:1994, Iron ores Determination of hygroscopic moisture in analytical samples Gravimetric and Karl Fischer methods is used. NOTE 2 A laboratory may elect to use ISO 2596 for all samples to determine the dry sample mass. 2 Normative references The following re

17、ferenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3082:2000, Iron ores Sampling and sample preparation procedur

18、es 3 Principle A test sample is dried to constant mass at 105 C. 4 Apparatus and materials Usual laboratory equipment and the following. 4.1 Balance, capable of reading the mass of the weighing container to 0,000 1 g. 4.2 Oven, capable of accommodating several weighing bottles (4.3) and maintaining

19、a temperature within the range 105 C 2 C. BS ISO 7764:20062 4.3 Weighing bottle, of volume 10 ml and mass not exceeding 6 g, having a diameter of not less than 50 mm. NOTE These dimensions are approximate and for guidance. Bottles may be of the conventional glass type having ground-glass lids, or su

20、itable plastic containers having tight-fitting lids. Plastic containers shall withstand 105 C 2 C. Polypropylene is suitable. 4.4 Silica gel desiccant, self indicating, dried at 105 C for 4 h. 4.5 Desiccator, made of borosilicate glass or an appropriate plastic, of internal diameter 150 mm to 250 mm

21、, having a vacuum stopcock that will allow the evacuation of air. The rim of the desiccator shall be lightly greased with silicon grease or petroleum jelly. 150 g to 200 g of dried silica gel (4.4) shall be replaced weekly. 5 Sampling and samples A laboratory sample having a particle size of less th

22、an 100 m, which has been taken and prepared in accordance with ISO 3082, shall be used. The sample shall be thoroughly mixed immediately before use. 6 Procedure Dry a weighing bottle (4.3) and a well-fitting lid at a temperature of 105 C 2 C and cool in a desiccator (4.5). Take, from the thoroughly

23、mixed laboratory sample, a test portion of not more than 10 g and transfer it to the dried weighing bottle (see third paragraph of this clause). Spread the test portion evenly in the weighing bottle. Dry the open weighing bottle with the test portion and the lid in a laboratory oven (4.2) for 2 h at

24、 105 C 2 C. Close the weighing bottle with the lid, transfer to a desiccator and cool to room temperature (20 min to 30 min). Slightly remove the lid and quickly replace it again, then weigh the bottle (with the lid on) to the nearest 0,000 1 g (m1). The test sample should be taken in multiple incre

25、ments, in such a way that it is representative of the whole contents of the container. Transfer the test portion quickly to the crucible and then weigh the weighing bottle with the lid on (m2). The mass of the test portion is the difference between the two weighings, m1and m2. BS ISO 7764:2006blankB

26、S ISO BSI389 Chiswick High RoadLondonW4 4AL7764:2006BSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter.RevisionsBritish S

27、tandards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions.It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while us

28、ing this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400.BSI offers members an individual updating service called PLUS which ensures that subscribers a

29、utomatically receive the latest editions of standards.Buying standardsOrders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-. Standards are also available from the BSI websit

30、e at http:/www.bsi-.In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested.Information on standardsBSI provides a wide range of information on national, European and inter

31、national standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Email: infobsi-.

32、Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: membershipbsi-.Inform

33、ation regarding online access to British Standards via British Standards Online can be found at http:/www.bsi- information about BSI is available on the BSI website at http:/www.bsi-.CopyrightCopyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of

34、the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from

35、 BSI.This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained.Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsi-.