(ISO NTERNATIONAL STANDARD 2961 Aluminium oxide primarily used for the production of aluminium - Determination of an adsorption index Oxyde d'aluminium principalementutilise pourla production de I'aluminium-Determination d'un indice d'adsorption First edition - 1974-02-15 ANsl Internct Doc Sect UDC 661.862.22 : 541.183.5 Ref.No.ISO2961-1974 (E) Descriptors : aluminium oxides,adsorption,tests. Price based on 4 pages Copyright International Organizationfor Standardization FOREWORD Iso (the International Organization for Standardization) is a worldwide federation of national standards institutes (Iso Member Bodies). The work of developing International Standards is carried out through IsO Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. Internationat organizations, governmental and non-governmental, in liaison with iso, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the ISo Council. International Standard ISO2961 was drawn up by Technical Committee ISO/TC 47, Chemistry, and circutated to the Member Bodies in October 1972. It has been approved by the Member Bodies of the following countries : Austria India Romania Beigium Israel South Africa, Rep. of Czechosiovakia Italy Sweden Egypt, Arab Rep. of Netherlands Thailand France New Zealand Turkey Germany Poland U.S.S.R. Hungary Portugal This International Standard has also been approved by the International Union of Pure and Applied Chemistry (IUPAC). The Member Body of the following country expressed disapproval of the document on technical grounds : Switzerland International Organization for Standardization, 1974 · Printed in Switzerland Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS Not for Resale ISO2961-1974 (E) INTERNATIONALSTANDARD Aluminium oxide primarily used for the production of aluminium -- Determination of an adsorption index OINTRODUCTION 4 FIRST METHOD,FOR ALUMINIUM OXIDE OF DENSITYHIGHERTHAN3,75g/ml Any industrial calcined aluminium oxide possesses, depending on its texture, a greater or lesser power of 4.1 Reagent adsorption of certain reagents,vapours or gases. The adsorption of a vapour or of a gas on a sample of 4.1.1 Carbon tetrachloride, p 1,594 g/ml, boiling point aluminium oxide follows the general laws of adsorption on 76,7 °℃. powdered solids. 4.2 Apparatus Ordinary laboratory apparatus and : 1SCOPEANDFIELDOFAPPLICATION This International Standard specifies two methods for the 4.2.1 Weighing bottle, squat form, of borosilicate glass, determination of an adsorption index for industrial calcined with ground giass cover, diameter 45 mm and height 28 mm aluminium oxide. (30mm with cover). The first method, using carbon tetrachloride vapour, is 4.2.2 Electric oven, with natural draught, capable of being applicable if the density is higher than 3,75 g/ml. The controlled at 300 ± 10 °c. second, using water vapour, is applicable if the density is lowerthan3.75g/ml. 4.2.3 Desiccator, preferably with freshly activated alumina or phosphorus pentoxide, but not calcium chloride. 2 REFERENCE 4.2.4 Glass vessel, for use as a desiccator, the dimensions ISO/R 802, Aluminium oxide primarily used for the ofwhichareshowninthefigure,fittedwithastainlesssteel production of aluminium - Preparation and storage of test support plate,perforated by 10 circular apertures evenly samples. distributed as shown in the figure, containing about 200 ml of the carbon tetrachloride (4.1.1), and placed inside an enclosureat25±0.5°c. 3PRINCIPLE 4.3 Procedure Evaluation of the adsorptive power by exposure of a previously.dried sample of aluminium oxidetoan 4.3.1 Test portion atmosphere saturatedwithcarbon tetrachloridevapouror water vapour conventional temperatureand Dry the weigh