1、BSH Bti*kQbs3: SECxiO.13 96 W Bb24bb9 0532734 BT4 BRITISH STANDARD Methods of sampling and test for Carbonaceous materials used in aluminium manufac ture Part 2. Electrode coke Section 2.13 Determination of tapped bulk density of green and calcined coke ICs 71.100.10 BS 6043 : Section 2.13 : 1996 IS
2、0 10236 : 1995 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI BS*b043: SEC*2.33 76 = 3624669 0532735 730 m BS 6043 : Section 2.13 : 1996 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee CIV24, R
3、aw materials for the aluminium industry, upon which the following bodies were represented Aluminium Federation British Ceramic Research Ud. Chemical Industries Association Institute of Petroleum Refractories Association of Great Britain This Briish Standard, having been prepared under the direction
4、of the Sector Board for Materiais and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 April 1996 O BSI 1996 Amendments issued since publication Amd.No. (Date I Text affected The following BSI references relate to the work on this standard: Committee re
5、ference CIN4 Draft for comment 91/54686 DC ISBN O 580 26615 8 BSI BS*b043: SEC*2-13 7b ltb2qbb9 0532736 677 BS 6043 : Section 2.13 : 1996 Contents page Committees responsible Inside fmnt cover National foreword ii Method 1 Scope 1 2 Normative references 3 Principle 4 APP- 5 Sampling and sample prepa
6、ration 6 Procedure 7 Expression of results 8 Precision 9 Test report 4 Figure 1 Bulk density measuring device 2 O BSI 1996 i BSI BS*bO43: SEC+2*13 96 m Lb24669 0532737 503 m BS 6043 : Section 2.13 : 1996 National foreword This British Standard has been prepared by CIE24 and is identical to IS0 10236
7、 Carbonaceous matemals for the production of aluminium - Green colce and calcined coke for electrodes - Detemzimtim of tupped bulk density of green and calcined cokes published by the Intemational Organization for Standardization (ISO), in the preparation of which the United Kingdom played a full pa
8、rt. Part 2 of BS 6043 provides methods of test for electrode coke as follows: Section Subject 2.2 2.3 Ashanalysis(AAS) 2.4 Ash amiysis (XRF) 2.5 Apparent density and porosityl) 2.6 Density (xylene method) 2.7 Oil content (gravimetzic method) 2.8 Oil content (extraction method) 2.9 Sieve analysis1) 2
9、.10 Electrical resistivity 2.11 Volatile matter content 2.12 2.13 2.1 sampling Ash content of green and calcined cokes Particle-size distribution of fine coke (laser difhction method) Determination of tapped bulk density of green and calcined cokes Identical with Is0 6375 IS0 8005 IS0 8004 IS0 6997
10、IS0 8723 IS0 10143 IS0 9406 no equivalent international standard IS0 10236 Cross-reference International standard Corresponding British Standard ES 6043 Methods of sampling and test fw carbonaceous materials used in aluminium manufacture Part 2: Electrode coke Section 2.1 : 1985 Sampling (Identical)
11、 IS0 6375 : 1990 Compliance with a British Standard does not of itself confer immunity from legal obligations. in preparation. u O BSI 1996 BSI BS*bO43: SEC*2=L3 96 I Lb24669 0532738 44T INTERNATIONAL STANDARD IS0 10236:1995(E) Carbonaceous materials for the production of aluminium - Green coke and
12、calcined coke for electrodes - Determination of bulk density (tapped) 1 Scope This International Standard specifies a method for the measurement of the bulk density of granular carbon and graphite materials used in the manufacture of carbon electrodes for the production of aluminium. Bulk density de
13、pends on the size, shape and porosity of the granules. For samples with similar grain size and shape, comparison of the real density with the bulk density (tapped) allows the porosity to be as- sessed. Coke porosity is an important quality par- ameter which can affect the quality and performance of
14、the carbon electrodes. 2 Normative references The following standards contain 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 a
15、greements based on this International Standard are encouraged to in- vestigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 3310-1 :1990, Test sieves - Technical requir
16、e- ments and testing - Part 1: Test sieves of metal wire cloth. IS0 6375: 1980, Carbonaceous materials for the pro- duction of aluminium - Coke for electrodes - Sam- pling. 3 Principle The volume of a known mass of material is deter- mined after tapping. The bulk density (tapped) is calcu- lated by
17、division of the known mass by the measured volume. 4 Apparatus Ordinary laboratory apparatus, plus the following: 4.1 Bulk density measuring device, as shown in figure 1, comprising the elements specified in 4.1.1 to 4.1.3. 4.1.1 Measuring cylinder, having a mass of 190 g k 15 g, with a scale readin
18、g from O to 250 MI, capable of measuring to I 1 ,O MI. 4.1.2 Cylinder holder, having a guided plunger with a mass of 450 g f 5 g. 4.1.3 Tapping device, capable of raising and drop- ping the plunger (see 4.1 2) 250 rt 15 times per minute from a height of 3 mm I 0,l mm, fitted with a counter to record
19、 the number of taps. 4.2 Test sieves, complying with the requirements of IS0 3310-1. 4.3 Oven, capable of being maintained at 120 “C I 5 “C. 4.4 Feeder, capable of filling the measuring cylinder in a controlled manner. 1 BSI BS*b043: SEC*?.-13 Yb I 1629bb% 8532739 386 IS0 10236:1995(E) I ml + 250J f
20、 230 210 190 * 150 Il 110 - t 70 t t t 30 1130 i_ 90 - 50 - - 10 I Dimensions in millimetres /- Cylinder holder with guided plunger Anvil Cam shaft Figure 1 - Bulk density measuring device 2 IS0 10236:1995(E) 5 Sampling and sample preparation 5.1 Sampling Sample the coke in accordance with IS0 6375.
21、 5.2 Sample preparation Heat the sample to 120 OC f 5 “C for 30 min using the oven (4.31, allow to cool in a desiccator and weigh. Repeat the operations of heating, cooling and weigh- ing until the difference between two successive weighings does not exceed 0,l % of the original sample mass. Divide
22、the sample, by screening through sieves (4.21, into fractions as follows: 4,O mm to 8,O mm 2,O mm to 4,O mm 1 ,O mm to 2,O mm 0,5 mm to 1,0 mm 0,25 mm to 0,5 mm The bulk density (tapped) may be determined using any of these fractions, provided that the fraction is detailed in the test report. The fr
23、action is normally decided by prior agreement. 6 Procedure 6.1 Test portion Weigh out 100 g k 5 g of the sample to the nearest 0,1 g. 6.2 Determination Assemble the bulk density measuring device (4.1 1, ensuring that the measuring cylinder (4.1.1) is vertical, and pour the test portion into the feed
24、er (4.4). Start the feeder and the tapping device (4.1.3) simul- taneously. Transfer the test portion evenly to the measuring cylinder in a time of 45 s f 15 s and con- tinue tapping for a total of 1 500 taps. Flatten the surface of the test portion in the measur- ing cylinder with a spatula and not
25、e the volume to the nearest 1 ml. 6.3 Number of determinations Carry out two determinations, tion for each determination. using a fresh test por- 6.4 Ambient temperature Measure and note the ambient temperature of the time of the test. 7 Expression of results Calculate the bulk density (tapped) pt,
26、expressed in grams per millilitre, of the material using the following equation: m Pt =v where m V is the mass, in grams, of the test portion; is the volume, in millilitres, of the test por- tion. Express the result as the arithmetic mean of two de- terminations to the nearest 0,Ol g/ml. 8 Precision
27、) 8.1 Repeatability The difference between the values of duplicate de- terminations, carried out in rapid succession by the same operator using the same apparatus on the same test sample, shall not exceed the repeatability r = 0,Ol g/ml. 8.2 Reproducibility The difference between the values of the a
28、verage of duplicate determinations obtained by two laboratories using this method for the analysis of the same labora- tory sample is not expected to exceed the reproduc- ibility limit R = 0,02 g/ml. 1) IS0 5725:1986, Precision of test methods - Determination of repeatability and reproducibility for
29、 a standard test method by inter-laboratory tests (now withdrawn), was used to obtain the precision data. 3 - BSI BSabO43: SEC*2-33 96 I Lb24bb9 0532743 T34 I IS0 10236:1995(E) 9 Testreport The test report shall include the following information: a) all details necessary for complete identification
30、of the sample; b) a reference to this International Standard; c) the size distribution of the grain fraction or frac- tions used; d) details of oil treatment of the coke during manu- facture (if known) and whether the oil had been removed prior to the test; e) the results, expressed in accordance wi
31、th clause 7; f) the ambient temperature; g) details of any unusual features noted during the determination; h) details of any operation not included in this Inter- national Standard or in the International Standards to which reference is made, as well as any oper- ation regarded as optional. 4 BSI B
32、S*b043: SEC*2.13 96 = Lb24669 0532742 970 BS 6043 : Section 2.13 : 1996 List of references See national foreword. O BSI 1996 BSI BS*bO43: SEC*2-L3 76 H 1624667 0532743 807 H BS 6043 : Section 2.13 : 1996 IS0 10236 : 1995 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BS
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