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Ref. No.: IS0 / R 550 - 1966 (E)
IS0
STA N DARD I Z AT1 O N
I NT ERN AT I ON AL O RG A N IZATl ON FOR
IS0 R E CO M M EN DATl O N
R 550
METHODS OF CHEMICAL ANALYSIS OF MANGANESE ORES
DETERMINATION OF TITANIUM CONTENT
1 st 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 550, Methods of Chemical Analysis of Manganese Ores
-Determination of Titanium Content, was drawn up by Technical Committee ISO/TC 65,
Manganese 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. 539) 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 :
Romania
Australia HwwY
Austria India Spain
Burma Iran U.A.R.
United Kingdom
Chile Ireland
Czechoslovakia Italy U.S.S.R.
France Japan Yugoslavia
Germany Poland
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 December 1966, to accept it as an IS0 RECOMMENDATION.
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IS0 Recommendation R 550 Decem ber 1966
METHODS OF CHEMICAL ANALYSIS OF MANGANESE ORES
DETERMINATION OF TITANIUM CONTENT
(Atomic mass Ti: 47.90; molecular mass Ti02: 79.90)
1. GENERAL INSTRUCTIONS
1.1 In the following analysis, use a sample for chemical analysis of air-dried manganese ore,
which has been crushed to a size not exceeding 0.10 mm and checked on a sieve of appro-
priate size.
Simultaneously with the collection of samples for the determination of titanium, take three
more test samples for the determination of hygroscopic moisture.
Calculate the content of titanium in ore which is absolutely dry by multiplying the numerical
K, as found from the
results of the determination of titanium by the conversion factor
following formula :
100
where A = hygroscopic moisture content, per cent.
1.2 The determination of titanium 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
sample of manganese ore, for titanium content.
The arithmetical mean of the three results is accepted as the final result.
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ISO/ R 550 - 1966 (E)
The foliowing 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
corresponding interval of titanium content), shown in the table under clause 5.2, " Accuracy
".
of method
The average result of the simultaneous check analysis of the standard sample of manganese
ore for titanium content should not differ from the result shown in the certificate by more
than the f value of the permissible tolerance (for the corresponding interval of titanium
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 should be weighed to an accuracy of f 0.0002 g.
1.4 Distilled water should be used in the determination 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 OC;
warm water (or solution) implies a temperature of the liquid of 40 to 50 OC;
diluted (1 : 1), (I : 2), (I : 9, etc. means that:
the first figure gives the number of parts by volume of concen-
trated 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 quantity 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
nm nanometer
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IS0 / R 550 - 1966 (E)
2. PRINCIPLE OF METHOD
The test sample of ore is dissolved in the hydrochloric acid. After the separation of the silicic
acid, titanium is precipitated with cupferron. Vanadium is separated by fusing the residue with
sodium carbonate and extracting it in water. By fusing titanium dioxide with potassium pyro-
sulphate, titanium is transformed into solution, its content being determined by the photometric
method with hydrogen peroxide.
3. REAGENTS REQUIRED
3.1 Sodium carbonate, anhydrous, CP.
3.2 Potassium pyrosulphate (K,S,O,), CP.
3.3 Ammonium sulphate ((NH4),SO&, CP, solution (50 g/l).
3.4 Hydrochloric acid, CP (d 1.19).
3.5 Sulphuric acid, CP (d 1.84).
L
3.6 Sulphuric acid, CP, diluted (1 : 1).
3.7 Sulphuric acid, CP, diluted (I : 10).
3.8 Sulphuric acid, CP, diluted (1 : 20).
3.9 Sulphuric acid, CP, diluted (1 : 50).
3.10 Phosphoric acid, CP (d 1.70).
3.11 Hydro8uoric acid, CP, 40 %.
3.12 Ammonia, CP (d 0.91).
3.13 Cupferron, CP, solution (30 g/l), freshly prepared.
3.14 Cupferron, CP, washing solution (20 ml of cupferron solution (30 g/l) and 40 ml of sulphuric
acid (d 1.84) per 1 litre of water).
3.15 Sodium carbonate, CP, solution (10 di).
L
3.16 Hydrogen peroxide, CP, solution 3 %.
3.17 Standard solution of titanium sulph
...