|
UDC 661.862.2 : 531.753
IS0
FOR STA N DA RDl ZATlO N
I NTERN AT ION A L O RG A N IZATl ON
IS0 RECOMMENDATION
R 901
ALUMlNlUlVl OXIDE PRIMARILY USED
FOR THE PRODUCTION OF ALUMINIUM
DETERMINATION OF ABSOLUTE DENSITY
PYKNOMETER METHOD
1st EDITION
December 1968
COPYRlGHT 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.
---------------------- Page: 1 ----------------------
BRIEF HISTORY
The IS0 Recommendation R 901, Aluminium oxide primarily used for the production of
aluminium - Determination of absolute density - Pyknometer method, was drawn up by Technical
Committee lSO/TC 47, Chemistry, the Secretariat of which is held by the Ente Nazionale Italiano
di Unificazione (UNI).
Work on this question by the Technical Committee began in 1962 and led, in 1966, to the
adoption of a Draft IS0 Recommendation.
-/
In May 1967, this Draft IS0 Recommendation (No. 1171) 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 :
Austria Israel South Africa, Rep. of
Belgium Italy Spain
Bulgaria Japan Sweden
Canada Korea, Dem. P. Rep. of Switzerland
Czechoslovakia Korea, Rep. of Thailand
France Netherlands Turkey
Germany New Zealand U.A.R.
Hungary Norway United Kingdom
India Poland U.S.A.
Iran Portugal U.S.S.R.
Ireland Romania Yugoslavia
No Member Body opposed the approval of the Draft.
The Draft 1SO Recommendation was then submitted by correspondence to the IS0 Council.
which decided, in December 1968, to accept it as an IS0 RECOMMENDATION.
- 2-
---------------------- Page: 2 ----------------------
E
ISO/R 901 -1968 (E)
IS0 Recommendation R 901 Decem ber 1 968
ALUMINIUM OXIDE PRIMARILY USED
FOR THE PRODUCTION OF ALUMINIUM
DETERMINATION OF ABSOLUTE DENSITY
PYKNOMETER METHOD
1. SCOPE
This IS0 Recommendation describes a method for the determination of the absolute density of aluminium
oxide primarily used for the production of aluminium.
2. PRINCIPLE
Determination by a pyknometer method of the absolute density of aluminium oxide after complete degasification.
3. REAGENTS
3.1 Xylene, d = 0.860 to 0.865, distilling between 138 and 144 "C (see clause 7.1).
3.2 Ethanol, 95 (V/V) solution, d = 0.81 approximately.
3.3 Diethyl ether, d = 0.715 approximately.
4. APPARATUS
Ordinary laboratory apparatus and
Pyknometer (see Fig. 1) consisting of
4.1
flask (A), approximately 25 ml capacity, fitted with a side arm with a ground-glass cover (F);
(a)
thermometer (B), covering the range 15 to 25 "C graduated in intervals of 0.1 "C, which can be
(b)
fitted to the flask by a ground-glass joint.
4.2 Degassingandfillingapparaîus, (see Fig. 2), consisting of a tap funnel (C) of about 50 ml capacity,
fitted with a side arm, with a tap (D) forconnecting to a vacuum pump. This can be fitted to the
pyknometer flask (A) by means of a conical ground-glass joint (E).
4.3 Water bath, controlled at a temperature of 20 f 0.1 OC.
4.4 Vacuum pump, capable of giving a vacuum below 10 mmHg.
4.5 Mercury manometer.
3-
---------------------- Page: 3 ----------------------
ISO/R 901-1968 (I
5. PROCEDURE
General Instructions
Always weigh the pyknometer with the thermometer and the side tube cover in position.
(1)
Always weigh to the nearest 0.1 mg.
(2)
When the pyknometer contains liquid, stabilize its temperature at 20 k 0.1 "C
(3)
5.1 Determination
5.1.1 Determination of the mass of the pyknometer. Wash the pyknometer (4.1) including its accessories,
with a lukewarm mixture of sulphuric acid and chromium trioxide. Thoroughly rinse, first with tap
water, then with distilled water and ethanol (3.2) and finally with diethyl ether (3.3). Thoroughly
dry the apparatus and weigh.
Let Mo be the mass, in grammes, of the dry pyknometer.
5.1.2 Determination of the volume of the pyknometer. Fill the pyknometer (4.1) with distilled water
and connect via the degassing apparatus (4.2) to the vacuum pump, the mercury manometer (4.5)
being inserted to control the vacuum. Close the side tube of the pyknometer with its cover (F)
and slowly open tap (D) and apply the vacuum for approximately 15 minutes. Occasionally tap
the walls of the pyknometer to facilitate the release of any air bubbles. Restore atmospheric
pressure in the pyknometer, disconnect it from the degassing apparatus (4.2) and put the therm@
meter (B) in position.
9 ml approximatel,
To vacuum
FIG. 1 - Pyknometer FIG. 2 ~ Degassing apparatus
---------------------- Page: 4 ----------------------
ISO/R 901-1968 (I
Stabilize the temperature of the
...