1、BRITISH STANDARD BS 6870-2.1: 1987 ISO 8558:1985 Analysis of aluminium ores Part 2: Chemical methods Section 2.1 Method of preparation of pre-dried test samples ISO title: Aluminium oresPreparation of pre-dried test samples UDC 553.492:543BS6870-2.1:1987 This British Standard, having been prepared u
2、nder the directionof the Non-ferrous Metals Standards Committee, waspublished under the authorityof the Board ofBSIandcomes into effect on 28August1987 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference NFM/31 Draft for comment 84/41558 DC ISBN 0 580 16
3、053 X National foreword This Section of BS6870 has been prepared under the direction of the Non-ferrous Metals Standards Committee. It is identical with ISO8558:1985 “Aluminium oresPreparation of pre-dried test samples”, published by the International Organization for Standardization (ISO). Terminol
4、ogy and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. Wherever
5、 the words “International Standard” appear, referring to this standard, they should be read as “Section of BS6870”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a B
6、ritish Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendmen
7、ts incorporated. This will be indicated in the amendment table on the inside front cover. Cross-reference International Standard Corresponding British Standard ISO 8557:1985 BS 6870 Analysis of aluminium ores Section 2.2:1987 Method for determination ofhygroscopic moisture in analytical samples:grav
8、imetric method (Identical) Amendments issued since publication Amd. No. Date of issue CommentsBS6870-2.1:1987 BSI 01-2000 i Contents Page National foreword Inside front cover 1 Scope and field of application 1 2 Reference 1 3 Principle 1 4 Apparatus 1 5 Sampling and samples 1 6 Procedure 1 Publicati
9、on referred to Inside back coverii blankBS6870-2.1:1987 BSI 01-2000 1 1 Scope and field of application This International Standard specifies a method for the preparation of pre-dried test samples which are to be used for the determination of analytical values of constituents in aluminium ores on a d
10、ry basis. When the analytical constituent to be calculated on a dry sample basis is aluminium or for determination of loss of mass at1075 C, ISO8557 shall be used. 2 Reference ISO 8557, Aluminium oresDetermination of hygroscopic moisture in analytical samples Gravimetric method. 3 Principle Drying o
11、f a test sample to constant mass at a temperature of105 C. 4 Apparatus Ordinary laboratory apparatus and 4.1 Weighing bottle, low form. 4.2 Laboratory oven, capable of being controlled at105 2 C. 4.3 Desiccator, containing either actived alumina, fresh magnesium perchlorate or diphosphorus pentoxide
12、 as desiccant. NOTEActivated alumina should be freshly activated by heating at300 10 C overnight. 5 Sampling and samples A laboratory sample with a particle size of less than1504m shall be used. The sample shall be thoroughly mixed, preferably by mechanical means, immediately before use. 6 Procedure
13、 Place a test sample of less than10g in the weighing bottle (4.1), previously dried in the laboratory oven(4.2), controlled at105 2 C. Dry the sample for16h in the oven, controlled at105 2 C. NOTEIn general, a weighing bottle of diameter not less than50mm should be used. However, a smaller bottle ma
14、y be used, on the condition that the layer density of the sample is not greater than5mg/mm 2 . Close the bottle with a well-fitting stopper and allow it to cool to room temperature (for30 to45min) in the desiccator (4.3). Slightly open the stopper and quickly close it again, then weigh the stoppered
15、 bottle and contents. Preserve the pre-dried test sample in the desiccator in the stoppered weighing bottle. Take and weigh the test portion quickly in order to minimize reabsorption of moisture. NOTEIf the analytical value is expected to be above10%, take and weigh a test portion on the day of pre-
16、drying.2 blankBS6870-2.1:1987 BSI 01-2000 Publication referred to See national foreword.BS 6870-2.1: 1987 ISO8558:1985 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on s
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