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UDC 664.741 1.742:620.1
IS0
I NTERNATI O NAL OR GAN I ZATl O N FOR STAN DARD IZATl O N
IS0 RECOM MEN DATION
R 586
DETERMINATION OF ASH OF COKE
1st EDITION
July 1967
COPYRIGHT RESERVED
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 586, Determination of Ash 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 (BSI).
Work on this question by the Technical Committee began in 1958 and led, in 1961, to the
adoption of a Draft IS0 Recommendation.
In March 1964, this Draft IS0 Recommendation (No.680) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature,
by the following Member Bodies:
Australia France Republic of South Africa
Austria Germany Romania
Belgium India Switzerland
Canada
Italy Turkey
Chile Korea, Rep. of U.A.R.
Colombia Netherlands United Kingdom
Czechoslovakia New Zealand U.S.A.
Denmark Poland U.S.S.R.
One Member Body opposed the approval of the Draft:
Japan
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in July 1967, to accept it as an IS0 RECOMMENDATION.
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ISO/R 586 - 1967 (E)
IS0 Recommendation R 586 July 1967
DETERMINATION OF ASH OF COKE
1. SCOPE
This IS0 Recommendation describes the method of determining the ash of coke.
2. PRINCIPLE
The coke is heated in air at 815 f 10 OC and maintained at this temperature until constant in
mass. The percentage of ash is calculated from the mass of residue after incineration.
Provided that steps are taken to prevent mechanical loss, the (precautionary) slow rate of heating
necessary for determining the ash of coal is unnecessary for coke, as that part of the sulphur in
coke which is combined with iron is present as ferrous sulphide which, unlike the iron pyrites in
coal, does not liberate sulphur on heating to 500 OC. The alkaline earths and all forms of sulphur
L
are usually present in only small amount in the hard coals used for coke-making, so that sulphation
of the ash is less likely with coke than with coal. Because coke is less reactive than coal, a thinner
layer is used to ensure that the test portion shall be burnt completely in a reasonable period of
time. The temperature of incineration is conventional and for convenience the same temperature
as that recommended for coal has been selected.
3. REAGENT
Desiccant. Either fresh or freshly regenerated, self-indicating, activated alumina, silica gel,
anhydrous calcium sulphate or phosphorus pentoxide, or freshly dried magnesium perchlorate.
NOTE. - Regeneration of magnesium perchlorate should not be attempted, owing to the risk of explosion; when
exhausted, the magnesium perchlorate should be washed down the sink with a current of water.
4. APPARATUS
4.1 Balance, sensitive to 0.1 mg.
'L
4.2 Muffle furnace, capable of providing a substantially uniform temperature zone at
815 f 10 OC, with a ventilation rate of at least four air changes per minute (see Note I).
4.3 Dish or crucible, of silica, porcelain or platinum, with lid (see Note 2), and of such a size
that the coke layer does not exceed 0.1 g/cm2.
4.4 Insulating plate. A flat plate 6 mm thick, of silica or other suitable insulating material,
which fits easily in the muffle.
4.5 Des
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