ISO INTERNATIONAL STANDARD 9055 First edition 1988-12-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXKAYHAPOAHAA OPrAHW3AMA O CTAHAAPTW3ALMW ANSI Internar Doc Sect Carbonaceous materials for the production of aluminium -- Pitch for electrodes - Determination of sulfur content by the bomb method Produits carbones utilisés pour la production de I'aluminium -- Brai pour eélectrodes - Dosagedusoufreparlamethodealabombe Reference number ISO 9055 : 1988 (E) ed without license from IHS Not for Resale ISO 9055 : 1988 (E) Foreword iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing Internationai Standards is normally carried out through Iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 9055 was prepared by Technical Committee ISO/TC 47, Chemistry. Annex A of this International Standard is for information only. International Organization for Standardization, 1988 @ Printed in Switzerland Copyright International Organization for Standardization Not for Resale INTERNATIONAL STANDARD ISO 9055 : 1988 (E) Carbonaceous materials for the production of aluminium --- Pitch for electrodes Determination of sulfur content by the bomb method WARNiNG - Strict adherence to all of the provisions prescribed in this International Standard should ensure against ex- plosive rupture of the bomb, or a blow-out, provided that the bomb is of proper design and construction and in good mechanical condition. It is desirable that the bomb be enclosed in a shield of steel plate at least 13 mm thick, or that equivalent protection be provided against unforseeable contingencies. Scope 4.1 Hydrochloric acid, α approximately 1,19 g/ml, approxi- 1 mately 37 % (m/ m) solution. This International Standard specifies a method for determining the sulfur content of pitch used in the production of alu- 4.2 Bromine water, saturated. minium. The method is applicable to pitches of both coal tar and petroleum origin, provided that they contain at least Barium chloride, 85 g/l solution. 4.3 0,1 % (m/m) sulfur. Dissolve 100 g of barium chloride dihydrate (BaCl2.2H20) in 2 Normative reference water and dilute to 1 000 ml. The following standard contains provisions which, through Sodium carbonate, 50 g/l solution. 4.4 reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was Dissolve 135 g of sodium carbonate decahydrate valid. All standards are subject to revision, and parties to (Na2CO3.10H20) or its equivalent mass in water and dilute to agreements based on this International Standard are encour 1 000 ml. aged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and Oxygen, free of combustible material and sulfur com- 4.5 ISO maintain registers of currently valid International Standards. pounds, available at a pressure of 4,053 MPa*). Iso 6257 : 1980, Carbonaceous materials used in the pro s White oil: liquid paraffin B.P. or equivalent. duction of aluminium --. Pitch for electrodes - Sampling. 4.6 5 Apparatus Principle Oxidation of the sample by combustion in a bomb containing Ordinary laboratory apparatus