1、BRITISH STANDARD BS 6043-2.16: 1998 ISO 11412: 1998 Methods of sampling and test for carbonaceous materials used in aluminium manufacture Part 2: Electrode coke Section 2.16 Determination of water content of calcined coke ICS 71.100.10; 75.160.10BS6043-2.16:1998 This British Standard, having been pr
2、epared under the directionof the Sector Board forMaterials and Chemicals, waspublished under the authorityof the Standards Boardand comes into effect on 15September 1998 BSI 04-1999 ISBN 0 580 30107 9 Amendments issued since publication Amd. No. Date CommentsBS6043-2.16:1998 BSI 04-1999 i Contents P
3、age National foreword ii Foreword iii Text of ISO 11412 1BS6043-2.16:1998 ii BSI 04-1999 National foreword This British Standard is the UK implementation of ISO 11412:1998. The UK participation in its preparation was entrusted to Technical Committee CII/24, Raw materials for the aluminium industry,
4、which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate
5、them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Part 2 of BS 6043 provides methods of test for electrode coke as follows: Cross-references The British Standards which implement international or European publications referred to in th
6、is document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. Section Subject 2.1 Sampling ISO 6375 2.2 Determination of ash content of green and calcined c
7、okes ISO 8005 2.3 Determination of trace elements in green and calcined coke by flame atomic absorbtion spectroscopy ISO 8658 2.4 Ash analysis by X-ray fluorescence spectroscopy(XRF) ISO 12980 2.5 Apparent density and porosity 2.6 Determination of the density in xylene of calcined cokes ISO 8004 2.7
8、 Determination of the apparent oil content of calcined cokes (gravimetric method) ISO 6997 2.8 Determination of the oil content by solvent extraction ofcalcined cokes ISO 8723 2.9 Sieve analysis 2.10 Determination of electrical resisivity of calcined coke granules ISO 10143 2.11 Determination of vol
9、atile matter content ISO 9406 2.12 Determination of particle size distribution of fine coke (laser diffraction method) 2.13 Determination of tapped bulk density of green and calcined coke ISO 10236 2.14 Determination of bulk density after vibration ISO 10480 2.15 Determination of grain stability of
10、calcined coke using alaboratory vibration mill ISO 10142 2.16 Determination of water content of calcined coke ISO 11412BS6043-2.16:1998 BSI 04-1999 iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their corr
11、ect 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 to iv, theISOtitle page, pages ii to iv, pages 1 and 2 and a back cover. This standard has been update
12、d (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankBS6043-2.16:1998 ii BSI 04-1999 Contents Page Foreword iii 1 Scope 1 2 Normative references 1 3 Principle 1 4 Apparatus 1 5 Sampling and sample preparation
13、 1 6 Procedure 1 7 Expression of results 1 8 Precision 1 9 Test report 2 Table 1 Repeatability and Reproducibility 1 Descriptors: Extractive metallurgy, aluminium, electrodes, carbonaceous materials, coke, tests, determination of content, water.BS6043-2.16:1998 BSI 04-1999 iii Foreword ISO (the Inte
14、rnational 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 which a technical committee has
15、 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 matters of electrotechnical s
16、tandardization. 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. International Standard ISO 11412 was prepared by Technica
17、l Committee ISO/TC 47, Chemistry, Subcommittee SC 7, Aluminium oxide, cryolite, aluminium fluoride, sodium fluoride, carbonaceous products for the aluminium industry.iv blankBS6043-2.16:1998 BSI 04-1999 1 1 Scope This International Standard specifies a method for the determination of the water conte
18、nt of calcined coke as a percentage by mass of the fragmented, granular carbon and graphite material (solid matter). The method is based on that described in DIN51904:1981, Prfung von Kohlenstoffmaterialien Bestimmung des Wassergehaltes Feststoffe. 2 Normative references The following standards cont
19、ain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investiga
20、te the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 5725-1:1994, Accuracy (trueness and precision) of measurement methods and results Part1:General principles and definitio
21、ns. ISO 6375:1980, Carbonaceous materials for the production of aluminium Coke for electrodes Sampling. 3 Principle A test portion is heated at (110 5) C. The percentage water content is then calculated from the difference between the masses before and after heating. 4 Apparatus 4.1 Drying oven, cap
22、able of being maintained at(110 5) C. 4.2 Analytical balance, capable of weighing to an accuracy of 0,1 g. 4.3 Drying tray, made of aluminium sheet, measuring approximately 300 mm by 500 mm, with a raised edge of approximately 30 mm. 5 Sampling and sample preparation Take the sample in accordance wi
23、th ISO 6375, but ensure that the sample passes completely through a sieve of aperture 30 mm. Store the sample in an airtight container such as a tin. 6 Procedure Carry out the determination in duplicate. Heat the drying tray (4.3) in the oven (4.1), set at(110 5) C, for 1h 5 min. Allow to cool to am
24、bient temperature in a desiccator and weigh to the nearest 0,1 g. Weigh 500 g to 1 000 g of the sample into the drying tray to the nearest 0,1 g, and dry in the oven at(110 5) C. Weigh at hourly intervals until consecutive weighings show a difference of less than0,1g. Before each weighing, let the t
25、est portion cool for approximately 30 min at a temperature of18C to 28 C. 7 Expression of results Calculate the water content w, expressed as percentage by mass, to the nearest 0,1 %, using the following equation: where Express the result as the arithmetic mean of the two determinations. 8 Precision
26、 The following data shall be used to determine the reliability of the results (see ISO 5725-1): 8.1 Repeatability The results of duplicate determinations, carried out in the same laboratory by the same operator with the same apparatus but at different times on representative test portions taken from
27、 the test sample, shall not differ by more than the values indicated in Table 1. 8.2 Reproducibility The means of the results of duplicate determinations, carried out in each of two laboratories on representative test portions taken from the same sample after the last stage of sample preparation, sh
28、all not differ by more than the values indicated in Table 1. Table 1 Repeatability and Reproducibility m 0 is the mass, in grams, of the test portion; m 1 is the mass, in grams, of the drying tray plus test portion before drying; m 2 is the mass, in grams, of the drying tray plus test portion after
29、drying. Water content Repeatability Reproducibility % % absolute % absolute10 0,6 1,3 w m 1 m 2 m 0 - 100 =BS6043-2.16:1998 2 BSI 04-1999 9 Test report The test report shall include the following information: a) all details necessary for the complete identification of the sample; b) a reference to t
30、his International Standard; c) the results, expressed in accordance with clause 7; d) the date of the test; e) details of any unusual features noted during the determination; f) details of any operation not included in this International Standard or in the International Standards to which reference
31、is made, as well as any operation regarded as optional.blankBS 6043-2.16: 1998 ISO 11412: 1998 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 standards in Europe and a
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