Coke (nominal top size greater than 20 mm) -- Size analysis

Coke (dimension supérieure nominale supérieure à 20 mm) -- Analyse granulométrique

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ISO 728:1981 - Coke (nominal top size greater than 20 mm) -- Size analysis
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International Standard @ 728


Coke (nominal top size greater than 20 mm) -
Size analysis

Coke (dimension supérieure nominale supérieure à 20 mml - Analyse granulométrique

Second edition - 1981-11-01
UDC 662.749.2 : 620.168.32 Ref. No. ISO728-1981 (E)
Descriptors : coke, size determination, grain size analysis.
Price based on 3 pages
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IS0 (the International Organization for Standardization) is a worldwide federation of

national standards institutes (IS0 member bodies). The work of developing Inter-
national 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, also 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 728 was developed by Technical Committee ISO/TC 27,
Solid mineral fuels.

This second edition was submitted directly to the IS0 Council, in accordance with

clause 5.10.1 of part 1 of the Directives for the technical work of ISO. It cancels and

replaces the first edition (i.e. IS0 728-1974), which had been approved by the member

bodies of the following countries :
Egypt, Arab Rep. of Romania
Austria Germany, F.R. South Africa, Rep. of
India Switzerland
Italy Turkey
Chile Korea, Rep. of United Kingdom
Colombia Netherlands USA
Czechoslovakia New Zealand USSR
Denmark Poland
The member body of the following country had expressed disapproval of the docu-
ment on technical grounds :
O International Organization for Standardization, 1981 0
Printed in Switzerland
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Coke (nominal top size greater than 20 mm) -
Size analysis
Scope and field of application 6 Procedure

This International Standard specifies a method of determining Select a set of sieves suitable for the purpose (see 9.1 and 9.2)

and, if possible, such that no size fraction will exceed
the particle size distribution of a sample of coke of nominal top

size greater than 20 mm. about 25 YO of the mass of the sample; arrange the sieves in a

stack in order of size aperture with the smallest at the bottom.
'- 2 References
Weigh the sample of coke, in several batches if necessary.
IS0 565, Test sieves - Woven metal wire cloth andperforated
plate - Nominal sizes of aperture.
Place on the top sieve a quantity of the sample small enough to
prevent choking and shake to allow most of the undersize to
IS0 2309. Coke - Sampling.
pass. Hand-place the coke remaining on the sieve (see 9.3) and
transfer the oversize to a suitable container. Remove the top
sieve and repeat these operations for sieves of aperture down
3 Principle
to 40 mm.
The sample is subjected to a process of size analysis by a

specified procedure and the result expressed in terms of the Continue this procedure for sieves of aperture less than 40 mm,

cumulative percentages by mass of coke remaining on sieves of but using hand-shaking only (see 9.4). until the oversize on

different sized apertures. each sieve has been placed in a separate container. Mechanical

sieving equipment may be used if it is proved to be free from
bias (see 9.5).
4 Apparatus
If necessary, re-stack the sieves and repeat the procedure for
4.1 Suitable series of sieves, of suitable woven metal wire
successive quantities until the entire sample has been sized. At
cloth, or perforated plate with round or square apertures, con-
the end of each sieving operation, the oversize remaining on
IS0 565.
forming to the requirements of
the sieve shall not cover more than 75 % of the sieving area.
4.2 Weighing machine, preferably of the platform type, of
Either weigh separately each container with its size fraction and
suitable capacity and such that the weighing error does not ex-
subtract the tare masses, or, after weighing the fraction of
ceed 0,l % of the maximum mass of sample taken, or 100 g,
largest size, add successively the other fractions and note the
whichever is the smaller.
cumulative mass after each addition. The second method is
preferable since it reduces the weighing error for the
cumulative fractions.
5 Sample
The sample shall be representative of the coke under considera-
tion. Its minimum mass will depend on its nominal upper size
and on the place from which it is sampled (see IS0 2309,
7 Expression of results
tables 2 and 3). The mass of the sample shall never be less than
40 kg and may be as much as 500 kg.
Record the mass of each size fraction. Calculate the cumulative
mass on each sieve starting with the sieve of largest aperture.
If the coke is excessively wet, the different size fractions will
have different moisture contents; this will lead to variable errors

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