8531 (iso International Standard Manganese and chromium ores - Experimental methods for checking the precision of moisture determination Minerais de manganese et de chrome - Methodes experimentales de controle de la fidelite de la determination de I'humidité First edition - 1986-11-15 UDC 553.32 + 553.461 : 543.712 Ref. No. ISO 8531-1986 (E) 0 8531-1986 (E) Descriptors : minerals and ores, manganese ores, chromate minerals, tosts, determination, humidity, fidelity. Price based on 5 pages without license from IHS Not for Resale 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, govern- mental 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. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 8531 was prepared by Technical Committee iSO/TC 65, Manganese and chromium ores. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. International Organization for Standardization, 1986 ? Printed in Switzerland Not for Resale INTERNATIONAL STANDARD ISO 8531-1986 (E) Manganese and chromium ores -- Experimental methods for checking the precision of moisture determination Scope and field of application Experimental method This International Standard specifies experimental methods to Sampling procedure 4.1 be applied for checking the precision of moisture determination of manganese and chromium ores, whether natural or pro- A pair of gross samples, or subsamples each of which consists cessed, being carried out in accordance with the methods of the number of increments of a specified mass as determined specified in the relevant International Standards. according to the requirements specified in Iso 4296/1, for manganese ores, and in a future International Standard, for NOTE -- An outline of the method for determination of permissible chromium ores, shall be constituted for a consignment. tolerance for duplicate moisture determinations on gross samples is given in the annex. 4.2 Preparation of experimental samples A pair of final moisture samples shall be prepared from each of References 2 the respective gross samples. The preparation of these two sets of samples shall be carried out separately. ISO 4296/1, Manganese ores - Sampling Part 1: Increment sampling. 4.3 Preparation of final moisture samples ISO 4296/2, Sampling Part 2: Manganeseores Preparation of samples. 4.3.1 The particle size and mass of the final moisture sample for coarse ores shall be minus 22,4 mm and 5 kg or minus IsO4299,.Manganese ores Determination of .moisture 10,0 mm and 1 kg. content. NOTE - Any reduction in sample size or mass of a moisture sample should be carried out with extreme caution to prevent loss of moisture. 3 General conditions 4.3.2 The particle size and mass of the final moisture sample for fine ores shall be minus 10,0 mm and 1 kg. See the figure 3.1 The sampling, preparation of moisture samples and for processes of moisture experiment, as an example. moisture determination shall be carried out in accordance with the methods specified in the relevant International Standards. 4.4 Apparatus and procedure of moisture testing 3.2 The mass and number of increments of a sample for the purposes of experiment shall be determined by applying the The re