1、BRITISH STANDARD BS 4140-9: 1986 ISO 902:1976 Methods of test for Aluminium oxide Part 9: Measurement of the angle of repose ISO title: Aluminium oxide primarily used for the production of aluminium Measurement of the angle of repose NOTEIt is recommended that this Part be read in conjunction with t
2、he general information given in BS 4140-0 “General introduction” which is issued separately. UDC 546.62331:620.1BS4140-9:1986 This British Standard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffect
3、 on 31 January 1986 BSI 10-1999 The committees responsible for this British Standard are shown inPart 0 The following BSI references relate to the work on this standard: Committee reference CIC/24 Draft for comment 85/52364 DC ISBN 0 580 14921 8 Amendments issued since publication Amd. No. Date of i
4、ssue CommentsBS4140-9:1986 BSI 10-1999 i Contents Page National foreword ii 1 Scope and field of application 1 2 References 1 3 Principle 1 4 Apparatus 1 5 Procedure 1 6 Expression of results 1 7 Test report 1 Annex ISO publications relating to aluminium oxide primarily used for the production of al
5、uminium 3 Figure Apparatus for the measurement of the angle of repose 2 Publications referred to Inside back coverBS4140-9:1986 ii BSI 10-1999 National foreword This Part of BS 4140 is identical with ISO 902:1976 “Aluminium oxide primarily used for the production of aluminium Measurement of the angl
6、e of repose” published by the International Organization for Standardization (ISO). This method supersedes clause 9 of Addendum No.1(1970) to BS4140:1967. Parts8 to10 of this standard collectively supersede Addendum No.1(1970) to BS4140:1967, which is withdrawn. Terminology and conventions. The text
7、 of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal
8、marker. In British Standards, it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. NOTEThe other International Standards listed in the Annex are for
9、 information only. Their correspondence with British Standards is summarized in BS 4140-0 “General information”. This standard prescribes methods of test only, and should not be used or quoted as a specification defining limits of purity. Reference to this Part should indicate that the method of tes
10、t used complies with BS 4140-9:1986. 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. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cros
11、s-reference International Standard Corresponding British Standard BS 4140 Methods of test for aluminium oxide ISO 802:1976 Part 1:1986 Preparation and storage of test samples (Identical) ISO 2927:1973 Part 20:1980 Sampling (Identical) Summary of pages This document comprises a front cover, an inside
12、 front cover, pagesi andii, pages1 to4, an inside 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.BS4140-9:1986 BSI 10-1999 1 1 Scope and field of applic
13、ation This International Standard specifies a conventional method for the measurement of the angle of repose of aluminium oxide primarily used for the production of aluminium. 2 References ISO 802, Aluminium oxide primarily used for the production of aluminium Preparation and storage of test samples
14、. ISO 2927, Aluminium oxide primarily used for the production of aluminium Sampling. 3 Principle Measurement of the angle at the base of the cone of aluminium oxide obtained by allowing a sample to fall through a fixed distance from a defined funnel onto a horizontal base plate. 4 Apparatus Only the
15、 dimensions given in the text are mandatory. The apparatus (see the Figure) consists of the following items: 4.1 Funnel, of stainless steel, having a nozzle of internal diameter6 mm, fitted with a sieve of1mm mesh aperture held in position between two retaining plates. The funnel is screwed into its
16、 support (4.3). 4.2 Base-plate, of minimum length270mm and minimum width200mm. It shall be perfectly rigid and made of marble, stainless steel or other corrosion-resistant metal. On the polished surface of the base-plate, four straight lines are engraved at angles of 45 to each other; at their inter
17、section is a locating pin to which the height block (4.4) can be fixed. It is provided with three adjustable levelling feet. 4.3 Funnel support, made in stainless steel and of substantial construction. It is designed so that the axis of the funnel is vertically over the central locating pin. 4.4 Hei
18、ght block, consisting of a metal cylinder with polished faces of height40,0min. The base has a recess to engage the central locating pin of the base-plate. 5 Procedure 5.1 Sample Use the crude sample (see3.2 of ISO802), at a temperature of22 4 C. 5.2 Determination 5.2.1 Level the base-plate (4.2) by
19、 means of the adjustable feet. 5.2.2 Put the height block (4.4) in position and adjust the funnel (4.1) until the nozzle is just in contact with the block. Secure the funnel in position and remove the height block. 5.2.3 Feed the aluminium oxide to the centre of the funnel from a height of about40mm
20、, taking care not to vibrate the apparatus. Adjust the powder flow to between20 and60g/min. If the sieve is clogged, use a brush to clear it, taking care not to vibrate the apparatus. When the top of the cone reaches the nozzle of the funnel, cease feeding the aluminium oxide. Using a pencil, mark t
21、he circumference of the base of the cone on the eight radii engraved on the base-plate. Remove the aluminium oxide and measure the four marked diameters. 6 Expression of results The angle of repose, expressed in degrees, is given by the formula where h is the height of the cone, i.e. the distance be
22、tween the base-plate and the nozzle of the funnel; is the arithmetic mean of the four diameters measured as specified in5.2.3; d iis the internal diameter of the nozzle of the funnel. When the apparatus described in clause 4 is used, the formula for the calculation of the angle of repose becomes 7 T
23、est report The test report shall include the following particulars: a) the reference of the method used; b) the results and the method of expression used; c) any unusual features noted during the determination; d) any operation not included in this International Standard or in the International Stan
24、dards to which reference is made, or regarded as optional. arctg 2 h dd i - d arctg 80 d 6 -BS4140-9:1986 2 BSI 10-1999 Figure Apparatus for the measurement of the angle of reposeBS4140-9:1986 BSI 10-1999 3 Annex ISO publications relating to aluminium oxide primarily used for the production of alumi
25、nium ISO 802, Preparation and storage of test samples. ISO 803, Determination of loss of mass at 300 C (conventional moisture). ISO 804, Preparation of solution for analysis Method by alkaline fusion. ISO 805, Determination of iron content 1,10-Phenanthroline photometric method. ISO 806, Determinati
26、on of loss of mass at1000 and1200 C. ISO 900, Determination of titanium contentDiantipyrylmethane photometric method. ISO 901, Determination of absolute density Pyknometer method. ISO 902, Measurement of the angle of repose. ISO 903, Determination of untamped density. ISO 1232, Determination of sili
27、ca content Reduced molybdosilicate spectrophotometric method. ISO 1617, Determination of sodium content Flame emission spectrophotometric method. ISO 1618, Determination of vanadium content N-Benzoyl-N-phenylhydroxylamine photometric method. ISO 2069, Determination of calcium contentFlame atomic abs
28、orption method. ISO/R 2070, Determination of calcium contentSpectrophotometric method using naphthalhydroxamic acid. ISO 2071, Determination of zinc content Flame atomic absorption method. ISO/R 2072, Determination of zinc content PAN photometric method. ISO 2073, Preparation of solution for analysi
29、sMethod by hydrochloric acid attack under pressure. ISO 2828, Determination of fluorine contentAlizarin complexone and lanthanum chloride spectrophotometric method. ISO 2829, Determination of phosphorus content Reduced phosphomolybdate spectrophotometric method. ISO 2865, Determination of boron cont
30、entCurcumin spectrophotometric method. ISO 2926, Particle size analysis Sieving method. ISO 2927, Sampling. ISO 2961, Determination of an adsorption index. ISO 3390, Determination of manganese content Flame atomic absorption method.4 blankBS4140-9:1986 BSI 10-1999 Publications referred to See nation
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