BS ISO 5940-2-2007 en_8149 Carbonaceous materials used in the production of aluminium - Pitch for electrodes - Determination of the softening point (Mettler softening point method)《铝生产用碳.pdf
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1、BRITISH STANDARD BS ISO 5940-2:2007 Carbonaceous materials used in the production of aluminium Pitch for electrodes Part 2: Determination of the softening point (Mettler softening point method) ICS 71.100.10 BS ISO 5940-2:2007 This British Standard was published under the authority of the Standards
2、Policy and Strategy Committee on 29 June 2007 BSI 2007 ISBN 978 0 580 52906 1 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 5940-2:2007. The UK participation in its preparation was entrusted to Technical Committee CII/24, Raw materials for the alumi
3、nium industry. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot conf
4、er immunity from legal obligations. Amendments issued since publication Amd. No. Date Comments Reference number ISO 5940-2:2007(E)INTERNATIONAL STANDARD ISO 5940-2 First edition 2007-05-01 Carbonaceous materials used in the production of aluminium Pitch for electrodes Part 2: Determination of the so
5、ftening point (Mettler softening point method) Produits carbons utiliss pour la production de laluminium Brai pour lectrodes Partie 2: Dtermination du point de ramollissement (Point de ramollissement par la mthode Mettler) BS ISO 5940-2:2007ii iii Foreword ISO (the International Organization for Sta
6、ndardization) 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 been established has the righ
7、t 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 standardization. International
8、Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an
9、 International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 5
10、940-2 was prepared by Technical Committee ISO/TC 226, Materials for the production of primary aluminium. ISO 5940 consists of the following parts, under the general title Carbonaceous materials used in the production of aluminium Pitch for electrodes: Part 1: Determination of the softening point by
11、the ring-and-ball method (will replace ISO 5940:1981) Part 2: Determination of the softening point (Mettler softening point method) BS ISO 5940-2:2007iv Introduction This part of ISO 5940 is based on DIN 51920 Testing of carbonaceous materials Determination of the Mettler softening point Binding and
12、 impregnating materials, prepared by NMP 281 “Prfverfahren fr Kohlenstoff und Graphit“ and published by DIN, Deutsches Institut fr Normung e.V., Berlin. Coal-tar pitch is used as a binding and impregnating agent in the production of carbon anodes for primary aluminium metal production. When heated,
13、pitch transforms gradually from a solid to a liquid. The analytical determination of a softening point described in this method is useful for characterizing this thermal behaviour of the coal-tar pitch when used as binder. The softening point is expressed as a temperature, in degrees Celsius (C). An
14、nex A gives an approximate comparison with softening points determined by other methods. BS ISO 5940-2:2007 1 Carbonaceous materials used in the production of aluminium Pitch for electrodes Part 2: Determination of the softening point (Mettler softening point method) 1 Scope This part of ISO 5940 sp
15、ecifies a method to determine the softening point of pitches by the Mettler method, within the range of 50 C to 180 C. It can be used for other organic materials that are used as binder and impregnating agents, where they have a Mettler softening point within the range of 50 C to 150 C. 2 Normative
16、references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6257, Carbonaceous materials used
17、in the production of aluminium Pitch for electrodes Sampling DIN 1333, Presentation of numerical data DIN 51848-1, Testing of mineral oils Precision General introduction, definitions and application to specifications 3 Principle A test portion of pitch is placed within a cylindrical sample cup with
18、an outlet diameter of 6,35 mm. The temperature is increased under constant conditions in air, until softened material issues from the outlet and interrupts a light barrier 19 mm below. BS ISO 5940-2:20072 4 Apparatus and reagents 4.1 Test apparatus 1)(see Figure 1) consisting of the parts given in 4
19、.1.1 to 4.1.7. 4.1.1 Electrically heated furnace. 4.1.2 Sample cup (see Figure 2), made from chrome-plated yellow brass or chrome nickel-steel. 4.1.3 Resistance thermometer, capable of measuring temperatures from 50 C to 180 C. 4.1.4 Cup holder. 4.1.5 Light barrier, capable of sensing the material a
20、s it issues from the sample cup. 4.1.6 Control unit, with a temperature indicator for the thermometer (4.1.3), and an indicator to show the operational status of the machine. 4.1.7 Collector, for the softened material. 4.2 Bowl, made of porcelain, Teflon or metal with a volume of about 50 ml. 4.3 Pl
21、ate, with a smooth surface, e.g. made of metal or glass. 4.4 Knife or spatula. 4.5 Release agent for cup, e.g. a mixture of glycerine and dextrin, ratio 1:1. 4.6 Electro-hydraulic press, as described in ASTM D3104, or another suitable press for filling the sample cup with grindable binder. 4.7 Punch
22、, suitable for pressing grindable pitch. 4.8 Balance, capable of weighing grindable pitch to an accuracy of 0,1 g. 1) Available from Mettler Toledo Inc. http:/. Further information on sources of supply can be obtained from: DIN-Bezugsquellen fr normgerechte Erzeugnisse of DIN Deutsches Institut fr N
23、ormung e. V., Burggrafenstrae 6, D-1000 Berlin 30. This information is given for the convenience of users of this part of ISO 5940 and does not constitute an endorsement by ISO of this apparatus. BS ISO 5940-2:2007 3Key 1 electrically heated furnace 2 sample cup 3 resistance thermometer 4 cup holder
24、 5 light barrier 6 control unit with temperature indicator Figure 1 Schematic picture of the testing apparatus BS ISO 5940-2:20074 Dimensions in millimetres Figure 2 Sample cup 5 Sampling Take a sample of the material in accordance with ISO 6257. 6 Sample preparation 6.1 Types of material Pitch can
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