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UDC 689.74
IS0
FOR STAND AR D I2 AT I O N
I NT ERN AT1 O N AL O RG A N IZATI O N
I SO R E CO M M EN DATI O N
R 551
METHODS OF CHEMICAL ANALYSIS OF MANGANESE ORES
DETERMINATION OF ZINC CONTENT
1st EDITION
December 1966
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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 551, Methods of Chemical Analysis of Manganese Ores-
of Zinc Content, was drawn up by Technical Committee ISO/TC 65, Man-
Determination
ganese Ores, the Secretariat of which is held by the Komitet standartov, Mer i Izmeritel’nyh
Priborov pri Sovete Ministrov SSSR (GOST).
Work on this question by the Technical Committee began in 1957 and led, in 1959, to
the adoption of a Draft IS0 Recommendation.
In November 1962, this Draft IS0 Recommendation (No. 540) 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 :
Spain
Australia India
Austria Iran U.A.R.
Burma Ir e 1 and United Kingdom
Chile Italy U.S.S.R.
Yugoslavia
Czechoslovakia Japan
France Poland
Hungary Romania
One Member Body opposed the approval of the Draft:
Germany.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council which decided, in December 1966, to accept it as an IS0 RECOMMENDATION.
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IS0 / R 551 - 1966 (E)
IS0 Recommendation R 551 Decem ber 1966
METHODS OF CHEMICAL ANALYSIS OF MANGANESE ORES
DETERMINATION OF ZINC CONTENT
(Atomic mass Zn: 65.38; molecular mass ZnO: 81.38)
1. GENERAL INSTRUCTIONS
1.1 In the following analysis, use a sample for chemical analysis of air-dried manganese
L
of
ore, which has been crushed to a size not exceeding 0.10 mm and checked on a sieve
appropriate size.
Simultaneously with the collection of samples for the determination of zinc, take three more
test samples for the determination of hygroscopic moisture.
Calculate the content of zinc in ore which is absolutely dry by inultiplying the numerical
results of the determination of zinc by the conversion factor K, as found from the following
formula :
-_ 1 O0
K=
100 - A
where A = hygroscopic moisture content, per cent.
1.2 The determination of zinc in manganese ore is carried out by simultaneously analysing three
samples of ore with two blank determinations to enable a corresponding correction in the
result of the determination to be made.
Simultaneously and under the same conditions, carry out a check analysis of a standard
L
sample of manganese ore, for zinc content.
The arithmetical mean of the three results is accepted as the final result.
The following conditions should be observed:
The maximum difference between the highest and the lowest results should not exceed double
the absolute value of the permissible tolerance on the result of the analysis (for the corre-
sponding interval of zinc content), shown in the table under clause 5.2, “Accuracy of
method ”.
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ISO/ R 551 - 1966 (E)
The average result of the simultaneous check analysis of the standard sample of manganese
ore for zinc content should not differ from the result shown in the certificate by more than
the & value of the ''permissible tolerance (for the corresponding interval of zinc content),
shown in the table under clause 5.2, " Accuracy of method ".
For the analysis take a standard sample of the type of ore to which the sample being analysed
belongs.
1.3 The test samples and the residues should be weighed to an accuracy of 5 0.0002 g.
1.4 Distilled water should be used during the procedure and for the preparation of solutions.
1.5 Meanings of the following expressions :
hot water (or solution) implies a temperature of the liquid of 60 to 70 "C
warm water (or solution) implies a temperature of the liquid of 40 to 50 "C
diluted (1 : 1), (1 : 2), (I : 5), etc. means that
the first figure gives the number of parts by volume of con-
centrated acid or some other solution, and
the second figure gives the number of parts by volume of water.
1.6 Indications as to the concentration of solutions show the mass of solute (in grammes) in
the corresponding volume of the solvent.
1.7 The following symbols and abbreviations are used:
CP chemically pure
d relative density
g gramme
g/1 grammes per litre
1 litre
ml millilitre
P micron
PFA pure for analysis
2. PRINCIPLE OF METHOD
The method consists of the separation of zinc from the accompanying elements in the form of
sulphide in formic medium and its precipitation in the form of complex salt
...