BS-6043-1.7-1988.pdf
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1、BRITISH STANDARD BS 6043-1.7: 1988 Methods of sampling and test for Carbonaceous materials used in aluminium manufacture Part 1: Electrode pitch Section 1.7 Determination of apparent density (buoyancy method) UDC 665.775/.777:661.66:669.71:620.168.33 Licensed Copy: sheffieldun sheffieldun, na, Wed D
2、ec 06 14:27:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6043-1.7:1988 This British Standard, having been prepared under the direction of the Chemicals Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 August 1988 BSI 10-1999 The following BSI
3、 references relate to the work on this standard: Committee reference CIC/24 Draft for comment 87/51004 DC ISBN 0 580 16639 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Committee (CIC/-) to Technical Committee CIC
4、/24, upon which the following bodies were represented: Aluminium Federation British Ceramic Research Ltd. British Tar Industry Association Chemical Industries Association Institute of Petroleum Refractories Association of Great Britain Amendments issued since publication Amd. No.Date of issueComment
5、s Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:27:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6043-1.7:1988 BSI 10-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Principle1 3Reagents1 4Apparatus1 5Sampling1 6Procedure1 7Calculation and expression o
6、f results2 8Precision2 9Test report2 Figure 1 Typical brass mould2 Table 1 Density of water2 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:27:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6043-1.7:1988 ii BSI 10-1999 Foreword This British Stan
7、dard has been prepared under the direction of the Chemicals Standards Committee to provide methods of sampling and test for carbonaceous materials used in the production of aluminium. The standard is published in two Parts, each Part being divided into Sections. The two Parts are: Part 1: Electrode
8、pitch; Part 2: Electrode coke. Part 1 comprises the following Sections: By agreement with the Standardization of Tar Products Tests Committee (STPTC), part of this method of test and descriptions of apparatus have been reproduced with editorial modifications from the publication “Standard methods fo
9、r testing tar and its products” (seventh edition 1979). For some years, the UK has participated in the work of Subcommittee 7 of Technical Committee 47, Chemistry, of the International Organization for Standardization (ISO). As international agreement is reached on the methods, it is expected that t
10、hey will be implemented in the UK by the publication of identical British Standards. However, the UK did not approve the method given in ISO 6999:1983, as the buoyancy method is preferred in the UK. This standard describes methods of test only and should not be used or quoted as a specification defi
11、ning limits of purity. Reference to this Section should state that the method of test used is in accordance with BS 6043-1.7:1988. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Comp
12、liance with a British Standard does not of itself confer immunity from legal obligations. SectionSubjectIdentical with 1.1SamplingISO 6257 1.2Water content (Dean and Stark method)ISO 5939 1.3Softening point (ring and ball method)ISO 5940 1.4Content of toluene-insoluble materialISO 6376 1.5Content of
13、 quinoline-insoluble materialISO 6791 1.6Coking valueISO 6998 1.7Density 1.8Ash contentISO 8006 1.9Sulphur contentISO 9055a a In preparation. 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 and a back cover. This stan
14、dard 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. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:27:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6043-1.7:1988 BSI 10-19991 1 Sco
15、pe This Section of BS 6043 describes a method for the determination of the apparent density of pitch which is solid at the temperature of test. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Principle A test piece is weighed in air and water. T
16、he difference between the two masses is equivalent to the volume of water displaced, from which the apparent density is calculated. 3 Reagents 3.1 Silicone high temperature grease, stable at approximately 50 C above the expected softening point of the pitch. 3.2 Water, complying with grade 3 of BS 3
17、978, freshly boiled and cooled. 4 Apparatus 4.1 Ordinary laboratory apparatus and the apparatus described in 4.2 to 4.8. 4.2 Brass mould, with a hole 50 mm in depth, an upper diameter of 25 mm and tapering to approximately 12.5 mm diameter (see Figure 1). 4.3 Brass plate, smooth, on which to stand t
18、he mould. 4.4 Oven, capable of being maintained at about 50 C above the expected softening point of the sample. 4.5 Stainless steel dish, approximate dimensions 55 mm in diameter, 35 mm deep, with a close-fitting lid. WARNING. Ensure that the lid does not form a seal as the risk of an explosion will
19、 arise. 4.6 Analytical balance, sensitive to 0.0001 g. 4.7 Bridge support, capable of supporting a beaker above the balance pan without making contact with it. 4.8 Thermometer, solid stem, mercury type, range 10 C to + 55 C complying with BS 1365. 5 Sampling Prepare a coarsely ground laboratory samp
20、le according to the method described in clause 8 of BS 6043-1.1:1981. 6 Procedure 6.1 Conditioning the mould Apply a light coat of the silicone grease (3.1) to the mould (4.2) and the plate (4.3). Stand the mould on the plate, with the wider diameter of the hole uppermost, and place in the oven (4.4
21、), which has been pre-set to a temperature of about 50 C above the expected softening point of the pitch, for 2 h. 6.2 Melting the pitch Weigh approximately 50 g of the laboratory sample (clause 5) into the dish (4.5), cover and plate it in the oven (4.4) at the same time as the mould (4.2) and plat
22、e (4.3). If the surface of the molten pitch is covered with froth, suggesting the presence of water, discard it and prepare another melt using a further 50 g of the laboratory sample, which has been dried by allowing it to stand for 24 h in an evacuated desiccator in the presence of an activated des
23、iccant. NOTEAfter heating, the surface of the molten pitch should be smooth, shiny and without a skin. Slow and gentle stirring of the pitch after 1 h in the oven may help to remove froth and may thus prevent bubbles forming in the test piece. 6.3 Preparation of the test piece and test specimen 6.3.
24、1 Remove the mould (4.2), plate (4.3) and dish (4.5) from the oven after 2 h. Pour the molten pitch into the well formed by the mould and plate, and allow it to cool. When cold, push out and invert the pitch casting and wipe it free of any silicone grease. 6.3.2 Carefully break off from the larger d
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