BS-5688-13-1979 ISO-3118-1976.pdf
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1、BRITISH STANDARD BS 5688-13: 1979 ISO 3118:1976 Methods of test for Boric acid, boric oxide, disodium tetraborates, sodium perborates and crude sodium borates for industrial use Part 13: Determination of particle size distribution of sodium perborates by mechanical sieving ISO title: Sodium perborat
2、es for industrial use Determination of particle size distribution by mechanical sieving NOTEIt is recommended that this Part be read in conjunction with the information in the “General introduction”, published separately as BS 5688-0. UDC 661.65:546.33273-39:620.168.32 Licensed Copy: sheffieldun she
3、ffieldun, na, Mon Dec 04 15:51:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5688-13:1979 This British Standard, having been prepared under the direction of the Chemicals Standards Committee, was published under the authority of the Executive Board on 28 February 1979 BSI 11-1999 The following BS
4、I references relate to the work on this standard: Committee reference CIC/16 Draft for comment 74/53496 DC ISBN 0 580 10546 6 Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:51:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI B
5、S 5688-13:1979 BSI 11-1999i Contents Page National forewordii 1Scope and field of application1 2Reference1 3Principle1 4Apparatus1 5Procedure1 6Expression of results1 7Test report1 Figure Diagram of movements in the horizontal plane2 Publications referred toInside back cover Licensed Copy: sheffield
6、un sheffieldun, na, Mon Dec 04 15:51:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5688-13:1979 ii BSI 11-1999 National foreword This Part of BS 5688 is identical with ISO 3118 “Sodium perborates for industrial use Determination of particle size distribution by mechanical sieving” published by th
7、e International Organization for Standardization (ISO). Terminology and conventions. The text of the International Standard has been approved as suitable for publication, without deviation, as a British Standard. Some terminology and certain conventions are not identical with those used in British S
8、tandards; attention is drawn to the following. The comma has been used throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Where the words “International Standard” appear, referring to this standard, they should be in
9、terpreted as “British Standard”. Additional information. In order to clarify the text, the following information is given. With reference to 4.2, the automatic device specified is commonly called a “mechanical sieve shaker”. With reference to 5.1, the spinning cone device mentioned in the note is co
10、mmonly called a “rotational sample divider”. With reference to 5.2, the earthing of the sieves referred to in the third paragraph is an inherent design feature of commercially available automatic devices. If the total of the masses of the sieved fractions differs from the mass of the test portions b
11、y more than 0.1 g, the test should be repeated until acceptable agreement is attained. When ISO 3118 is reviewed it is intended to suggest that these clarifications be incorporated in its text. A British Standard does not purport to include all the necessary provisions of a contract. Users of Britis
12、h Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-reference International StandardCorresponding British Standard ISO 565:1972BS 410:1976 Specification for test sieves (Related) Summary of pag
13、es 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 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
14、. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:51:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5688-13:1979 BSI 11-19991 1 Scope and field of application This International Standard specifies a method for the determination of the particle size distribution by mechanical sieving of s
15、odium perborates for industrial use. 2 Reference ISO 565, Test sieves Woven wire cloth and perforated plate Nominal sizes of apertures. 3 Principle Mechanical sieving of a test portion under specified conditions. Weighing of each of the fractions. 4 Apparatus Ordinary laboratory apparatus and 4.1 Se
16、ries of circular sieves (see ISO 565), with metallic mountings, approximately 200 mm diameter, capable of being fitted tightly together and including a base and a cover. The sieves shall be chosen by agreement between the interested parties. 4.2 Automatic device, capable of applying to a set of four
17、 sieves, base and cover fitted, combined movements in the horizontal plane and impacts along the vertical axis. The movement of the horizontal plane is defined as follows (see Figure): the centre of the sieves shall follow the same movement as the mid-point C of a straight line AB of length 380 mm.
18、One extremity A of this line describes a circle, of radius r = 20 mm, in a horizontal plane. The other extremity B is constrained to describe a straight line, of length 2r = 40 mm, lying on the line passing through the centre O of the circle. The complete movement shall be repeated about 300 times p
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