BS 6043-2 12-1994 Methods of sampling and test for carbonaceous materials used in aluminium manufacture - Electrode coke - Determination of particle size distribution of fine coke《.pdf

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1、BRITISH STANDARD BS 6043-2.12: 1994 Methods of sampling and test for Carbonaceous materials used in aluminium manufacture Part 2: Electrode coke Section 2.12 Determination of particle size distribution of fine coke UDC 669.713.7:665.777:620.168.3BS6043-2.12:1994 This British Standard, having been pr

2、epared under the directionof the Chemicals Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15May1994 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference CIC/24 Draft for comment 93/505982 DC ISBN

3、 0 580 22856 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Policy Committee (CIC/-) to Technical Committee CIC/24, upon which the following bodies were represented: Aluminium Federation British Ceramic Research Lt

4、d. Chemical Industries Association Institute of Petroleum Refractories Association of Great Britain Amendments issued since publication Amd. No. Date CommentsBS6043-2.12:1994 BSI 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Normative references 1 3 Princi

5、ple 1 4 Reagent 1 5 Apparatus 1 6 Sampling and preparation of test sample 1 7 Procedure 1 8 Test report 2 List of references Inside back coverBS6043-2.12:1994 ii BSI 10-1999 Foreword This Section of BS6043 has been prepared under the direction of the Chemicals Standards Policy Committee. BS6043 prov

6、ides methods of sampling and test for carbonaceous materials used in aluminium manufacture. The standard is published in four Parts, each Part being divided into Sections. Part 2 comprises a series of methods of test for electrode coke as follows: It is essential to use BS3406-1:1986 in conjunction

7、with this Section of BS6043. This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at an

8、y stage. This standard describes a method of test only, and should not be used or quoted as a specification defining the characteristics of a product. Reference to this Section should indicate that the method of test used in accordance with BS6043-2.12:1994. A British Standard does not purport to in

9、clude all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Section Subject Identical with 2.1 Sampling ISO 6375 2.2 Ash content of green and

10、calcined cokes ISO 8005 2.3 Ash analysis (AAS) 2.4 Ash analysis (XRF) 2.5 Apparent density and porosity 2.6 Density (xylene method) ISO 8004 2.7 Oil content (gravimetric method) ISO 6997 2.8 Oil content (extraction method) ISO 8723 2.9 Sieve analysis 2.10 Electrical resistivity 2.11 Volatile matter

11、content 2.12 Particle-size distribution of fine coke (laserdiffractionmethod) 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 amend

12、ments incorporated. This will be indicated in the amendment table on the inside front cover.BS6043-2.12:1994 BSI 10-1999 1 1 Scope This Section of BS6043 describes a method for the determination of the particle size distribution of fine calcined petroleum coke powders by a laser diffraction procedur

13、e. The method is applicable to particle size analysers capable of measuring particle size distributions in the approximate range1m to500m. 2 Normative references This Section of BS6043 incorporates, by dated or undated reference, provisions from other publications. These normative references are mad

14、e at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this Section of BS6043 only when incorporated in the reference by

15、amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 3 Principle A representative sample of the petroleum coke powder is sieved to remove any oversize particles which would fall outside the measurement range of the laser di

16、ffraction equipment, and the amounts of material passing through and retained on the sieve are weighed and recorded. A representative subsample of the material which passes through the sieve is dispersed at a suitable concentration in methanol and is passed through the beam of a monochromatic laser

17、light source. The light scattered by the particles in the near-forward direction is recorded by a multi-element detector and the numerical values relating to the scattering pattern are passed to a computer memory. The stored data representing the scattering pattern are transformed, using an adequate

18、 optical model and mathematical procedure to yield the proportions of the total volume present in a discrete number of size classes to form a volumetric particle size distribution. 4 Reagent 4.1 Methanol, general purpose reagent grade. WARNING. Refer to the reagent suppliers Health and Safety data s

19、heets for the precautions which are to be taken for the safe use of methanol. NOTEIt is essential to use methanol for all reference purposes. However, for routine purposes dispersion media other than methanol may be used. 5 Apparatus 5.1 Ordinary laboratory apparatus 5.2 Laser-diffraction particle s

20、ize analyser, capable of measuring the particle size distribution of powder, having a measurement range which includes the range of the petroleum coke to be tested and having a sample dispersion unit, a sample cell, and data handling facilities. NOTEThe sample cell of the particle size analyser may

21、be of the static or flow-through types. 5.3 Test sieve, conforming to BS410:1986, having a nominal aperture size slightly smaller than the upper limit of the measurement range of the particle size analyser (5.2), typically500m, and having an appropriate lid and receiver. 5.4 Microscope, with associa

22、ted light source, suitable for examining dispersions by transmitted light at a nominal linear magnification of approximately 500. 5.5 Ultrasonic bath 6 Sampling and preparation of test sample Prepare a representative test sample of approximately10g of the coke in accordance with clause13 or clause14

23、 of BS3406-1:1986. Sieve the test sample using the test sieve (5.3) to separate any particles which are larger than the upper limit of the size range of the laser particle size analyser(5.2). Weigh the material retained on the sieve and set it aside. Record the mass. Carefully brush the sieve to rem

24、ove any fine particles which may be clinging to the mesh or elsewhere. Add this material to the coke which passed through the sieve, weigh the combined undersize material then mix it thoroughly and use this material for the particle size analysis. 7 Procedure 7.1 Setting up Follow the manufacturers

25、instructions for setting up the laser diffraction particle size analyser (5.2) for the expected range of particle sizes.BS6043-2.12:1994 2 BSI 10-1999 7.2 Sample dispersion Disperse an appropriate amount of the test sample (see clause6) in the methanol (4.1) in the test cell in accordance with the i

26、nstrument manufacturers instructions. In the first instance disperse the sample solely by stirring and after the recommended time has elapsed withdraw a small amount of the dispersion by pipette and examine it using the microscope (5.4) for the presence of agglomerates. If agglomerates are present s

27、ubject the dispersion in the instrument to ultrasonic treatment for1min then repeat the microscopic examination. Repeat the ultrasonic treatment until agglomeration is no longer detected under the microscope, but take care to use the minimum period of ultrasonic treatment which achieves this aim. 7.

28、3 Measurement Measure the particle size distribution of the coke in accordance with the instrument manufacturers instructions, producing the test result in the form of a table showing the cumulative percentage of undersize material at each of the size points in the range for which the instrument was

29、 set up. If the option exists, also produce the test result in graphical form as a curve showing the cumulative percentage of undersize material (as ordinate) against particle size (as abscissa). Perform a duplicate measurement using a new portion of the test sample (see clause6). Express the test r

30、esult as the average of the two sets of measurements. In the event that the test result shows that the particle size range for which the instrument was set up is inappropriate, select an appropriate size range and repeat the measurement. If the instrument does not have an appropriate range include a

31、 comment to this effect in the test report (seeclause8). 8 Test report The test report shall include the following information: a) a complete identification of the sample; b) a reference to this British Standard, i.e.BS6043-2.12:1994; c) the amount of oversize material, expressed as a percentage by

32、mass, removed by sieving prior to the determination; d) the manufacturers name and the model identification of the laser diffraction particle size analyser (5.2); e) the type of sample cell (5.2) used; f) the particle size distribution measurement result (see7.3) expressed as a table showing the cum

33、ulative percentage of undersize material at each of the particle-size points associated with the instrumental range used; g) a graphical representation of the particle size distribution if this is available as an instrumental output option; h) any unusual features noted during the determination; i)

34、any operation not included in this British Standard or regarded as optional.BS6043-2.12:1994 BSI 10-1999 List of references (see clause2) Normative references BSI publications BRITISH STANDARDS INSTITUTION, London BS 410:1986, Specification for test sieves. BS 3406, Methods for determination of part

35、icle size distribution. BS 3406-1:1986, Guide to powder sampling. BS 6043-2.12: 1994 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 at the inte

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