BS 6043-2 15-1997 Methods of sampling and test for carbonaceous materials used in aluminium manufacture - Electrode coke - Determination of grain stability of calcined coke using a.pdf

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1、BRITISH STANDARD BS 6043-2.15: 1997 ISO 10142:1996 Methods of sampling and test for Carbonaceous materials for use in aluminium manufacture Part 2: Electrode coke Section 2.15 Determination of grain stability of calcined coke using a laboratory vibration mill ICS 71.100.10BS 6043-2.15:1997 This Brit

2、ish Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 February 1997 BSI 12-1998 The following BSI references relate to the work on this standard: Committee reference

3、 CII/24 Draft for comment 91/54685 DC ISBN 0 580 26919 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee CII/24, Raw materials for the aluminium industry, upon which the following bodies were represented: Aluminium Federa

4、tion British Ceramic Research Ltd. Chemical Industries Association Institute of Petroleum Refractories Association of Great Britain Amendments issued since publication Amd. No. Date CommentsBS 6043-2.15:1997 BSI 12-1998 i Contents Page Committees responsible Inside front cover National foreword ii 1

5、 Scope 1 2 Normative references 1 3 Principle 1 4 Apparatus 1 5 Sampling and preparation of the test sample 5 6 Procedure 5 7 Expression of results 5 8 Precision 5 9 Test report 5 Figure 1 Laboratory vibration mill Front view 2 Figure 2 Laboratory vibration mill Side view 2 Figure 3 Laboratory vibra

6、tion mill Ground plan 3 Figure 4 Imbalance discs 4 Figure 5 Grinding vessel 4 List of references Inside back coverBS 6043-2.15:1997 ii BSI 12-1998 National foreword This British Standard has been prepared by Technical Committee CII/24 and is identical with ISO10142:1996 Carbonaceous materials for us

7、e in the production of aluminium Calcined coke Determination of grain stability using a laboratory vibration mill, published by the International Organization for Standardization (ISO). Part 2 of BS6043 provides methods of test for electrode coke as follows: A related British Standard to ISO 3310-1:

8、1990 is BS 410:1986 Specification for test sieves. 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 is in accordance with BS 6043-2.13:1995 A

9、 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 British Standard does not of itself confer immunity from legal obligations. Section Subject 2.1 Sampling ISO 6375 2.2

10、Ash content of green and calcined cokes ISO 8005 2.3 Ash analysis (AAS) a 2.4 Ash analysis (XRF) a 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 a 2.10 Electrical re

11、sistivity of calcined coke granules ISO 10143 2.11 Volatile matter content ISO 9406 2.12 Particle size distribution of fine coke (laser diffraction method) No equivalent international standard 2.13 Determination of tapped bulk density of green and calcined coke ISO 10236 2.14 Determination of bulk d

12、ensity after vibration a 2.15 Determination of grain stability of calcined coke using a laboratory vibration mill ISO 10142 a In preparation. Cross-reference Publication referred to Corresponding British Standard ISO 6375:1980 BS 6043 Methods of sampling and test for carbonaceous materials used in a

13、luminium manufacture Section2.1 Sampling (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This w

14、ill be indicated in the amendment table on the inside front cover.BS6043-2.15:1997 BSI 12-1998 1 1 Scope Calcined coke with poor mechanical strength may become degraded during mixing. Poor grain stability will affect the grain size and may result in poor quality of baked blocks. This International S

15、tandard describes a laboratory vibration mill method for the determination of the grain stability of calcined coke for the manufacture of carbon products used in the manufacture of aluminium. 2 Normative references The following standards contain provisions which, through reference in this text, con

16、stitute 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 investigate the possibility of applying the most recent editions o

17、f the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 3310-1:1990, Test sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth. ISO 6375:1980, Carbonaceous materials for the production of aluminium Coke f

18、or electrodes Sampling. 3 Principle The 4 mm to 8 mm fraction of a sample of calcined coke is subjected to the grinding action of a laboratory vibration mill and the percentage residue retained on a specified sieve screen is measured. 4 Apparatus 4.1 Laboratory vibration mill, having two grinding ve

19、ssels, each filled with 1 kg of clean, hard steel balls, diameter 10 mm 0,4 mm. The main features of the mill are shown in Figure 1 to Figure 5. The mill (1) and drive motor (9) are mounted on a common base plate (2). The grinding vessels (7,8) are installed in the body of the mill, which is support

20、ed by four soft, flat springs (4). The spring suspension system is designed to allow the machine to be operated without any fastenings or anchorage. The grinding vessels are secured by adjustable straps (5) which have a quick-release catch (13). The oscillator is supported on a bearing (6), fitted t

21、o the body of the mill, and is driven by the motor (9) via a special clutch (3) and a hollow flexible shaft (12). The peak-to-peak amplitude of the vibration shall be 4 mm 0,5 mm. A reference disc is fitted to the front of the machine to measure the amplitude of vibration. The motor shall be capable

22、 of 1450rpm to1470rpm. The bearing housing (11) is rigidly connected to the bearings (6). The shaft (12) rotates inside the bearings with two steel imbalance discs(10) attached and is connected to the motor via the clutch (3). The imbalance discs are shown inFigure 4. The imbalance discs rotate ecce

23、ntrically and the entire oscillating mass follows with a phase lag of180, supported by the springs. Each grinding vessel (see Figure 5) has a total volume of 1litre and an effective volume of0,3litres. It is closed by a lid (15) with a rubber sealing ring (16). The lid is held in place by a clamp(17

24、) fitted with a wing nut (18). The electric motor is linked to a timer switch having a precision of 2s. 4.2 Sieves, mesh size 4 mm and 8 mm, conforming to the requirements of ISO 3310-1.BS 6043-2.15:1997 2 BSI 12-1998 Figure 1 Laboratory vibration mill Front view Figure 2 Laboratory vibration mill S

25、ide viewBS6043-2.15:1997 BSI 12-1998 3 Figure 3 Laboratory vibration mill Ground planBS 6043-2.15:1997 4 BSI 12-1998 Figure 4 Imbalance discs Figure 5 Grinding vesselBS6043-2.15:1997 BSI 12-1998 5 5 Sampling and preparation of the test sample Sample in accordance with ISO 6375. Do not precrush the s

26、ample. Sieve the sample to collect200g of coke of grain size between 4mm and8mm. 6 Procedure Carefully place 1kg of the steel balls and100g 0,01g of the 4mm to 8mm fraction of the sieved test sample in each grinding vessel and close the lid. Attach the vessels to the vibration mill. Turn the mill on

27、 and grind the sample for 3,5min as measured by the timer switch. Carefully empty the contents of one vessel on to an8mm sieve, placed on top of a 4mm sieve. Screen by hand, using approximately 60 horizontal movements in about half a minute. The steel balls will remain on the 8mm sieve, and part of

28、the granular material will remain on the 4mm sieve. Weigh the portion of granular material which remains on the 4mm sieve to the nearest 0,01g. Repeat with the contents of the other vessel. 7 Expression of results The grain stability GS of the calcined coke, expressed in per cent, is given by the eq

29、uation where If GS 1and GS 2differ by less thanthe repeatability of the method, report the result, GS, as the mean of the simultaneous duplicate determinations GS 1and GS 2 , to the nearest 0,01 %. If GS 1and GS 2differ by more than the repeatability of the method, repeat the procedure detailed in c

30、lause 6. If the difference between the mean result of each pair of simultaneous duplicate tests is less than the repeatability of the method, report the result as the mean of the means. Otherwise reject all the results and repeat the determination. 8 Precision 8.1 Repeatability The results of duplic

31、ate determinations, carried out at different times in the same laboratory by the same operator with the same apparatus, on representative portions taken from the same test sample, should not differ by more than 2 % absolute. 8.2 Reproducibility The means of the results of duplicate determinations, c

32、arried out in each of two different laboratories, on representative portions taken from the same sample after the last stage of sample preparation, should not differ by more than 3 % absolute. 9 Test report The test report shall include the following particulars: a) a reference to this International

33、 Standard; b) all details necessary for identification of the sample; c) the result of the test; 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 regarded as optional. GS 1 is the gr

34、ain stability for vessel 1; GS 2 is the grain stability for vessel 2; m 1 is the mass, in grams, of test sample placed in vessel 1; m 2 is the mass, in grams, of test sample placed in vessel 2; m 3 is the mass, in grams, of test sample from vessel 1 retained on the 4 mm sieve; m 4 is the mass, in gr

35、ams, of test sample from vessel 2 retained on the 4 mm sieve.GSGS 1GS 2 + 2 - 1 2 - m 3 m 1 -100 m 4 m 2 -100 + = 2 2 6 blankBS 6043-2.15:1997 BSI 12-1998 List of references See national foreword.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

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