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 It supersedes BS 7020-1:1988 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee ISE/58, Iron ores, which has the responsibility to: aid enquirers to understand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
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