BS-6870-2.2-1987 ISO-8557-1985.pdf
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1、BRITISH STANDARD BS 6870-2.2: 1987 ISO 8557:1985 Analysis of aluminium ores Part 2: Chemical methods Section 2.2 Method for determination of hygroscopic moisture in analytical samples: gravimetric method ISO title: Aluminium ores Determination of hygroscopic moisture in analytical samples Gravimetri
2、c method UDC 553.492:543 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:48:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6870-2.2:1987 This British Standard, having been prepared under the direction of the Non-ferrous Metals Standards Committee, was published under the authority of the
3、 Board of BSI and comes into effect on 28 August 1987 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference NFM/31 Draft for comment 84/41557 DC ISBN 0 580 16054 8 National foreword This Section of BS 6870 has been prepared under the direction of the Non-f
4、errous Metals Standards Committee. It is identical with ISO 8557:1985 “Aluminium ores Determination of hygroscopic moisture in analytical samples Gravimetric method”, published by the International Organization for Standardization (ISO). Terminology and conventions. The text of the International Sta
5、ndard 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. The comma has been used as a decimal marker. In British Standa
6、rds it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “Section of BS 6870”. A British Standard does not purport to include all the necessary provisions of a contract
7、. Users of British Standards are responsible for their correct application. Compliance with a British 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, pages 1 and 2, an inside back cover
8、 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Cross-reference International StandardCorresponding British Standard ISO 8558:1985BS 6870 Analysis of aluminium or
9、es Section 2.1:1987 Method of preparation of pre-dried test samples (Identical) Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:48:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6870-2.2:1987 BSI 11-1999i Contents Page Nat
10、ional forewordInside front cover 1Scope and field of application1 2Reference1 3Principle1 4Material1 5Apparatus1 6Sampling and samples1 7Procedure1 8Expression of results2 9Test report2 Publication referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:48:44 GMT+00:00
11、 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:48:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6870-2.2:1987 BSI 11-19991 1 Scope and field of application This International Standard specifies a gravimetric loss of mass method for the determi
12、nation of hygroscopic moisture in analytical samples of aluminium ores. The method is applicable to products having hygroscopic moisture contents, expressed as water (H2O), in the range 0,1 to 5 % (m/m), and shall be used to correct the results obtained for aluminium and loss of mass at 1 075 C to a
13、 dry basis. NOTEThe hygroscopic moisture can be taken into account for other determinations by using a pre-dried sample prepared in accordance with ISO 8558. 2 Reference ISO 8558, Aluminium ores Preparation of pre-dried test samples. 3 Principle Drying of the test portion in air at approximately 105
14、 C and recording of the loss of mass. 4 Material 4.1 Desiccant: activated alumina, magnesium perchlorate or diphosphorus pentoxide. NOTEActivated alumina should be freshly activated by heating overnight at 300 10 C. 5 Apparatus Ordinary laboratory apparatus and 5.1 Weighing bottles, of glass or meta
15、l, of diameter approximately 50 mm. 5.2 Dishes, flat bottom, for equilibration of samples with the laboratory atmosphere. The bottom of the dishes shall be about 20 cm2 in area. 5.3 Laboratory oven, capable of being controlled at 105 2 C. 5.4 Desiccator 6 Sampling and samples 6.1 Sample Use an air-d
16、ried sample with a particle size of less than 150 4m. 6.2 Preparation of the test sample Take approximately 10 g of the laboratory sample and transfer to a dish (5.2). Spread the sample evenly and allow to equilibrate with the laboratory atmosphere for a minimum of 2 h. 7 Procedure 7.1 Number of det
17、erminations Carry out the determination in duplicate on each aluminium ore. 7.2 Preparation of the weighing bottle Dry a weighing bottle and lid (5.1) by heating for 1 h in the laboratory oven (5.3), controlled at 105 2 C. Transfer bottle and lid to the desiccator (5.4), containing a suitable fresh
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