1、BRITISH STANDARD BS 6043-4.3: 1991 Methods of sampling and test for Carbonaceous materials used in aluminium manufacture Part 4: Cold ramming pastes Section 4.3 Determination of aggregate size distribution after extraction by dichloromethane NOTEIt is recommended that this Section be read in conjunc
2、tion with the general information in BS6043-4.0, published separately.BS6043-4.3:1991 This British Standard, having been prepared under the directionof the Chemicals Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 30September 1991 BSI 10-199
3、9 The following BSI references relate to the work on this standard: Committee reference CIC/24 Draft for comment 90/54843 DC ISBN 0 580 19933 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Policy Committee (CIC/-)
4、to Technical Committee CIC/24, upon which the following bodies were represented: Aluminium Federation British Ceramic Research Ltd. Chemical Industries Association Institute of Petroleum Refractories Association of Great Britain Amendments issued since publication Amd. No. Date CommentsBS6043-4.3:19
5、91 BSI 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii 0 Introduction 1 1 Scope 1 2 Principle 1 3 Reagent 1 4 Apparatus 1 5 Sampling 1 6 Preparation of test sample 1 7 Procedure 1 8 Calculation and expression of results 2 9 Test report 2 Publication(s) referred to Insid
6、e back coverBS6043-4.3:1991 ii BSI 10-1999 Foreword This Section of BS6043 has been prepared under the direction of the Chemicals Standards Policy Committee to provide a method of test for cold ramming pastes used in the production of aluminium. There is no corresponding InternationalStandard; howev
7、er, it is intended, upon publication of this Section of BS6043, that it be offered to the InternationalOrganization for Standardization (ISO) for possible adoption as an InternationalStandard. It is essential that BS6043-4.1 be read in conjunction with this Section of BS6043. This standard describes
8、 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 is in accordance with BS6043-4.3:1991. A British Standard does not purport to include all the necessary provis
9、ions 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. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1and 2, an ins
10、ide back cover and a back cover. This standard 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.BS6043-4.3:1991 BSI 10-1999 1 0 Introduction This Section of BS6043 provides a routine method for det
11、ermining the particle-size distribution of the aggregate in cold ramming pastes where recourse to the more rigorous method using quinoline (seeBS6043-4.2) would not be justified,e.g. in quality control of production of cold ramming pastes. The selection of dichloromethane as the solvent is appropria
12、te for cold ramming pastes made with coal-tar or bituminous binders. For pastes made with other types of binder,e.g. resins, the principle still applies, but the use of an alternative solvent may be necessary. Therefore, these products are outside the scope of this Section of BS6043 (seeclause1). 1
13、Scope This Section of BS6043 describes a method for determining the particle-size distribution of the solid aggregate component of cold ramming pastes used in aluminium manufacture. The method is applicable to cold ramming pastes made with coal-tar or bituminous binders but not applicable for resin-
14、based binders. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Principle A test portion of the cold ramming paste is digested under reflux with dichloromethane to dissolve the binder. The digestion mixture is poured on to a fine-aperture sieve,
15、upon which the majority of the aggregate is retained, and is washed free of residual binder with further portions of dichloromethane and then dried. The particle-size distribution of the solids retained of the fine-aperture sieve is determined by test sieving. 3 Reagent WARNING. Refer to the reagent
16、 suppliers health and safety data sheets for the precautions which are to be observed for the safe use of dichloromethane. 3.1 Dichloromethane, (methylene dichloride), of purity at least98% (m/m). 4 Apparatus 4.1 Ordinary laboratory apparatus 4.2 Distillation flask, round-bottomed, of borosilicate g
17、lass, capacity2L, with a ground-glass socket. 4.3 Reflux condenser, water-jacketted, of effective length300mm, with a ground-glass cone matching the socket of the distillation flask (4.2). 4.4 Electric heating mantle, capable of maintaining gentle boiling of the contents of the distillation flask(4.
18、2) whilst under reflux. 4.5 Nest of test sieves, 200mm in diameter, complying with BS410, of stainless-steel wire cloth, with nominal apertures of between53m and5mm inclusive, with lid and receiver. NOTEOther nominal sizes recommended for inclusion are:2mm and1mm, 500m,250m,150m and75m. 4.6 Receiver
19、 test sieve, 200mm in diameter, complying with BS410, of stainless-steel wire cloth, of53m nominal aperture. Prepare by heating in the electric oven (4.8) for1h at a temperature of110 5 C then allow to cool to ambient temperature in a desiccator and store in the desiccator until required for use. 4.
20、7 Dish, of glass or porcelain, capable of fitting below the receiver test sieve (4.6) and collecting all the liquids which pass through. 4.8 Electric oven, of size sufficient to contain the receiver test sieve (4.6), capable of being controlled at110 5 C. 4.9 Mechanical sieve shaker, capable of acco
21、mmodating the nest of test sieves (4.5) with the lid and receiver, as described inBS1796-1. 5 Sampling Prepare a representative laboratory sample of cold ramming paste in accordance with BS6043-4.1. 6 Preparation of test sample Take 100 0.05g from the laboratory sample (seeclause5) of cold ramming p
22、aste in accordance with5.5.3 ofBS6043-4.1:1991. 7 Procedure 7.1 Transfer the test sample (seeclause6) quantitatively to the distillation flask (4.2). Add1L of the dichloromethane (3.1) and swirl the contents of the flask to mix the test sample with the solvent. Place the flask in the electric heatin
23、g mantle (4.4) and fit the reflux condenser (4.3) to the flask. Circulate cooling water through the condenser jacket. Bring the contents of the flask to a steady boil and continue boiling under reflux for1h. Switch off the electric heating mantle and allow the flask and its contents to cool to ambie
24、nt temperature. Weigh the dried receiver test sieve(4.6) to the nearest0.05g then place it over the dish (4.7). Carefully transfer the contents of the flask as completely as possible to the sieve.BS6043-4.3:1991 2 BSI 10-1999 Rinse the flask using successive20mL portions of the dichloromethane until
25、 all the visible solids have been transferred to the sieve. Wash the contents of the sieve with the dichloromethane until the washings passing through the sieve show no additional colour due to dissolved binder. After the final wash, leave the sieve and its contents for1h and discard the washings. P
26、lace the receiver test sieve with its contents in the oven (4.8) maintained at110 5 C for1h, taking care that no boiling of residual dichloromethane occurs, leading to loss of solids. Remove the receiver test sieve with its contents and allow to cool to ambient temperature in a desiccator. Weigh the
27、 receiver test sieve and its contents to the nearest0.01g. Repeat the operations of heating, cooling and weighing until the difference between two consecutive weighings does not exceed0.05g. 7.2 Recover the dried aggregate from the receiver test sieve (see7.1) by inverting the sieve over a suitably
28、sized piece of clean smooth-surfaced paper. Remove any particles trapped in the mesh by tapping and gently brushing the underside of the sieve cloth. 7.3 Sieve the recovered aggregate (see7.2) using the nest of sieves and the mechanical sieve shaker(4.9) in accordance with BS1796-1 for dry sieving.
29、8 Calculation and expression of results Calculation the percentage values, by mass, of material retained on each sieve (see7.3), on the basis of the mass of aggregate recovered in7.1. Express the results to one decimal place. Tabulate the results as the percentage values by mass of material retained
30、 on the individual sieves in descending order of nominal aperture. 9 Test report The test report shall include the following information: a) a complete identification of the test sample; b) a reference to this BritishStandard, i.e.BS6043-4.3:1991; c) the results for the aggregate size distribution,
31、expressed in accordance with clause8; d) any usual features noted during the determination; e) any operation not included in this BritishStandard or regarded as optional.BS6043-4.3:1991 BSI 10-1999 Publication(s) referred to BS 410, Specification for test sieves. BS 1796, Test sieving. BS 1796-1, Me
32、thods using test sieves of woven wire cloth and perforated metal plate. BS 6043, Methods of sampling and test for carbonaceous materials used in aluminium manufacture. BS 6043-4, Cold ramming pastes. BS 6043-4.0, General introduction 1) . BS 6043-4.1, Methods of sampling. BS 6043-4.2, Determination
33、of effective binder content and aggregate content by extraction with quinoline; determination of aggregate size distribution. 1) Referred to on the front cover only.BS 6043-4.3: 1991 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsi
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