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1、INTERNATIONAL STANDARD 3118 INTiRNAT ON4L ORGANIZATION FOR STANDARDIZATION .MEX:LI HAPOIHAII OPrAHM3AUMR n0 CTAHDAPTM3AUACI.ORGANISATION INTERNATIONALE DE NoRMALSATON Sodium perborates for industrial use - Determination of particle size distribution by mechanical sieving Perborates de sodium ii usag
2、e industriel - Analyse granulomktrique par tamisage mkcanique First edition - 1976-04-01 g -Typrp,c I-$- s Price based on 3 pages FOREWORD IS0 (the International Organization for Standardization) is a worldwide federation of national standards institutes (IS0 Member Bodies). The work of developing I
3、nternational Standards is carried out through IS0 Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liaison with ISO, al
4、so take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the IS0 Council. International Standard IS0 3118 was drawn up by Technical Committee ISOITC 47, Chemistry
5、, and circulated to the Member Bodies in April 1973. It has been approved by the Member Bodies of the following countries : Australia Austria Belgium Bulgaria Czechoslovakia Egypt, Arab Rep. of France Germany Hungary India Ireland Israel Italy Netherlands New Zealand Poland No Member Body expressed
6、disapproval of the document. Romania South Africa, Rep. of Spain Switzerland Thailand Turkey United Kingdom U.S.S.R. 0 International Organization for Standardization, 1976 l Printed in Switzerland INTERNATIONAL STANDARD IS0 3118-1976 (El Sodium perborates for industrial use - Determinatio n of parti
7、cle size distribution by mechanical sieving 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies a method for the determination of the particle size distribution by mechan- ical sieving of sodium perborates for industrial use. 2 REFERENCE IS0 565, Test sieves - Woven wire cloth and
8、 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 Series of circular sieves (see IS0 565), with metallic mountings, approximately 200 mm dia
9、meter, 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 sieves, base and cover fitted, combined movements in the horizontal plane and impacts a
10、long 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. One extremity A of this line describes a circle, of radius r = 20 mm, in a horizontal p
11、lane. The other extremity B is constrained to describe a straight line, of length 2r = 40 mm, lying on the line passing through the centre 0 of the circle. The complete movement shall be repeated about 300 times per minute. The vertical impacts are produced by a weight of about I,2 kg failing from a
12、 height of 40 mm on a rubber pad fixed on a plate on the cover. The frequency of impacts shall be about 150 impacts per minute, and these shall not give rise to a vertical displacement of the sieves of greater than 0,5 mm. NOTE - A device conforming to these specifications is commercially available
13、and information on suppliers may be obtained from national standards organizations. 5 PROCEDURE 5.1 Test portion Weigh, to the nearest 0,Ol g, 45 to 55 g of the laboratory sample. NOTE - If the sample needs to be divided, this should be carried out by an appropriate device which will ensure a repres
14、entative sample, particularly with respect to particle size distribution, for example a spinning cone device. 5.2 Determination Fit the sieves (4.1), cleaned and dried, one within the other in decreasing order of aperture size, and add the base. Place the sieve with the smallest aperture at the bott
15、om, on the base. Place the sieve with the largest aperture at the top. Transfer quantitatively the test portion (5.1) to the topmost sieve and close the sieve with the cover. Fix the set of sieves on to the automatic device (4.2) and connect to earth by a conductor. Sieve for 5 min. or such a time a
16、s may be agreed between the interested parties, and then weigh the contents of each sieve to the nearest 0,Ol g. The total of the masses obtained should be equal, to within f 0,l g, to the mass of the test portion (5.1). 6 EXPRESSION OF RESULTS Calculate a) the percentage by mass of the test portion
17、 which is retained on each sieve; b) the percentage by mass of the test portion which passes through the sieve with the smallest aperture. 7 TEST 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)
18、 any unusual features noted during the determi- nation; d) any operation not included in this International Standard, or regarded as optional. -,-,- IS0 3118-1976 (E) Dimensions in millimetres A ,-. / ,o -_ -A- l FIGURE - Diagram of movements in the horizontal plane 2 -,-,- IS0 3118-1976 (E) ANNEX I
19、S0 PUBLICATIONS RELATING TO (A) BORIC ACID, (B) BORIC OXIDE, (C) D/SODIUM TETRABORATES, (D) SODIUM PERBORATES, AND (E) CRUDE SODIUM BORATES, FOR INDUSTRIAL USE Applicability A B C D ABC E ABC ABC E E E E E D ABC C E ABC ABCDE D E E D IS0 1914 - Determination of boric acid content - Volumetric method
20、. IS0 1915 - Determination of boric oxide content - Volumetric method. IS0 1916 - Determination of sodium oxide and boric oxide contents and loss on ignition. IS0 1917 - Determination of sodium oxide, boric oxide and available oxygen contents - Volumetric methods. IS0 1918 - Determination of sulphur
21、 compounds - Volumetric method. IS0 2214 - Determination of manganese content - Formaldehyde oxime photometric method. IS0 2215 - Determination of copper content - Zinc dibenzyldithiocarbamate photometric method. IS0 2216 - Determination of sodium oxide and boric oxide contents - Volumetric method.
22、IS0 2217 - Determination of matter insoluble in alkaline medium and preparation of test solutions. IS0 2218 - Determination of loss in mass after heating at 900 C. IS0 2760 - Determination of total aluminium content - Titrimetric method. IS0 2761 - Determination of total titanium content - Photometr
23、ic method. IS0 3118 - Determination of particle size distribution by mechanical sieving. IS0 3119 - Determination of chromium content - Diphenylcarbazide photometric method. IS0 3120 - Determination of water content - Gravimetric method. IS0 3121 - Determination of chloride content - Mercurimetric m
24、ethod. IS0 3122 - Determination of iron content - 2,2 -Bipyridyl photometric method. IS0 3123 - Determination of rate of solution - Conductivity method. IS0 3124 - Determination of iron soluble in alkaline medium - 2,2 -Bipyridyl photometric method. IS0 3125 - Determination of aluminium soluble in alkaline medium - EDTA titrimetric method. IS0 3424 - Determination of bulk density. 3