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UDC 662.7411.742: 620.1
IS0
I NT ERN AT I O NA L O RG A N IZAT I O N FO R STA ND AR D I2 AT I O N
I S O R E CO M M E N DATI O N
R 556
DETERMINATION OF THE MICUM INDICES OF COKE
1 st EDITION
February 1967
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The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 556, Deterniination of the Micum Indices of Coke, was
drawn up by Technical Committee ISO/TC 27, Solid Mineral Fuels, the Secretariat of
which is held by the British Standards Institution (BSJ).
Work on this question by the Technical Committee began in 1955 and led, in 1963,
to the adoption of a Draft IS0 Recommendation.
In June 1963, this Draft IS0 Recommendation (No. 571) was circulated to all the IS0
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Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial
nature, by the following Member Bodies :
Argentina Germany Romania
Australia
India Spain
Austria Iran Switzerland
Belgium Italy Turkey
Canada
Netherlands United Kingdom
Chile
New Zealand U.S.S.R.
Czechoslovakia Poland Yugoslavia
Denmark Portugal
France Republic of South Africa
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by Correspondence to the IS0
Council, which decided, in February 1967, to accept it as an IS0 RECOMMENDATION.
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iSO/ R 558 - 1S7 (E)
February 1967
IS0 Recommendation R 556
DETERMINATION OF THE MICUM INDICES OF COKE
1. SCOPE
This IS0 Recommendation describes the method of determining the strength of coke by the
Micum * test.
2. PRINCIPLE
Coke, sieved to retain pieces over a specified size, is subjected to treatment under standardized
conditions in a rotating drum. ïhe results of size analysis of the treated coke are used as indices
of its resistance to breakage on impact and by abrasion.
3. APPARATUS
Test drum (see Figure below) ; cylindrical drum, 1OOOL-5 mm in internal length and
3.1
1000f5 mm in internal diameter, of steel plate of minimum thickness 5 mm (as used, i.e.
even after wear) and preferably of welded construction.
Detail of cover and frame
Plate not less than
100 cm infernal
, 5mm thick
-(no
////////////'////////////rf//////////////s: II I I
' i00cm
i
Side elevation half in section on B B End elevation half in Sectton on A A
Four steel angles, each 100 mm (see Note, p. 6) x 50 mm, 10 mm thick, and of the full
length of the drum, are fixed to the internal cylindrical surface, parallel to the axis of the
drum and spaced at 90" intervals so as to divide the periphery into four equal sectors. They
are fixed so that the legs which are 100 mm long point towards the axis, the other legs being
of rotation
attached to the surface and orientated in a direction opposite to the direction
of the drum.
* Micum: Abbreviation of " Mission interalliée de contrôle des usines et des mines " (Interallied Control Mission Of
Works and Mines).
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!SO/ R 556 - 1967 (E)
The drum has ~?II opening in the cylindrical wall, for charging and discharging. This should
be as large as possible to facilitate emptying and cleaning of the drum. It is recommended
that the size of this opening should be a minimum of 600 mm x 500 mm, the length being
parallel to the axis of the drum. The charging hole is closed by a curved cover of suitable
thickness which can be fixed in such a way that, when it is in place, the inside face is level
with the internal surface of the drum. A rubber gasket may with advantage be used on the
cover to minimize loss of dust.
The drum is mounted in bearings by means of a stub axle attached to each end (i.e. the axle
should not pass through the drum), to allow it to be rotated on its horizontal axis. The
bearings are mounted on supports of a height which will enable the drum to be emptied and
cleaned conveniently after the test. A sloping plate is fitted underneath and close to the drum
to facilitate collection of the coke when it is discharged. It is desirable that the test apparatus
should be fitted with
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