ISO INTERNATIONAL STANDARD 10237 Firstedition 1997-05-15 Carbonaceous materials for use in the production of aluminium - Calcined coke Determination of residual-hydrogen content Produits carbonés utilisés pour la production de Ialuminium - Coke calcine - Détermination de la teneur en hydrogene residuel TSO Reference number ISO10237:1997(E) y IHS under ted without license from IHS Not for Resale ISO 10237:1997(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International 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, governmental 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. circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO10237was prepared byTechnical Committee ISO/TC47， Chemistry, Subcommittee Sc 7, Aluminium oxide, cryolite, aluminium fluoride, sodium fluoride, carbonaceous products for the aluminium industry. @ISO1997 or utilized in any form or by any means, electronic ormechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Casepostale56.CH-1211Geneve20.Switzerland Internet: [email protected] X.400: C=ch; a=40Onet; p=iso; O=isocs; S=central Printed in Switzerland CopyhationarganizatifStandardizaio it license from IHS Not for Resale ISO 10237:1997(E) INTERNATIONALSTANDARD @ISO Carbonaceous materials for use in the production of aluminium - Calcined coke - Determination of residual-hydrogen content 1 Scope Green coke is calcined prior to being used for the fabrication of anodes for the electrolytic production of aluminium A criterion for the degree of calcination is the hydrogen residue. This International Standard specifies a method for determining the residual-hydrogen content of calcined coke used in the production of aluminium. The method is only applicable to products having a residual-hydrogen content of iess than 1 % (m/m). NOTE -- At concentrations of less than 1 % (m/m), hydrogen is mainly bound to condensed aromatic rings and less to side chains. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this possibility of applying the most recent editions of the standards indicated below. Members of IEC and Iso maintain registers of currently valid International Standards. Iso 4793:1980, Laboratory sintered (fritted) filters - Porosity grading, classification and designation. ISO 6375:1980, Carbonaceous materials for the production of aluminium - - Coke for electrodes - Sampling. 3Principle passed over copper() oxide and lead(ll) chromate. The water that has formed, in which the hydrogen of the sample is bound, is subsequently absorbed in a drying agent. The hydrogen content of the test portion is calculated from the increase in mass of the drying agent. 4 Reagents During the analysis, use only reagents of recognized analytical grade and only distlled water or water of equivalent purity. 4.1 Copper(I) oxide (CuO), in wire form 1 Noreproductionornetworkin ing permitted without lic Not for Resale