1、International Standard f& 8558 0 Q 4 4!& INTERNATIONAL ORGANATON FORSTANDARWATNOMEYHAPAHA OPTAHMBAWI no CTAHPTH3A#WORGANlSATlON INTERNATIONALE DE NRALISATION Aluminium ores - Preparation of pre-dried test samples Minerais alumineux - Pkparation d%chantillons .or&h& pour essai First edition - 1985-12
2、15 Gi UDC 553.492 : 543.05 Ref. No. IS0 8558-1985 (E) 3 ii Descriptors : minerals and ores, aluminium ores, samples, test specimens, specimen preparation. 8 E Price based on 1 page Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reprod
3、uction or networking permitted without license from IHS-,-,-Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical commit
4、tees. 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 adop
5、ted by the technical committees are circulated to the member bodies for approval before their acceptance.as International Standards by the IS0 Council, They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 8558 wa
6、s prepared by Technical Committee ISO/TC 129, Aluminium 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. 0 International Organization
7、 for Standardization, 1985 l Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-INTERNATIONAL STANDARD IS0 8558-1985 (El Aluminium ores - Preparation
8、of pre-dried test samples 1 Scope and field of application This International Standard specifies a method for the prepara- tion of pre-dried test samples which are to be used for the determination of analytical values of constituents in aluminium ores on a dry basis. When the analytical constituent
9、to be calculated on a drysam- ple basis is aluminium or for determination of loss of mass at 1 075 OC, IS0 8557 shall be used. 2 Reference IS0 8557, Aluminium ores - Determination of hygroscopic moisture in analytical samples - Gravimetric method. 3 Principle Drying of a test sample to constant mass
10、 at a temperature of 105 oc. 4 Apparatus Ordinary laboratory apparatus and 4.1 Weighing bottle, low form. 4.2 Laboratory oven, capable of being controlled at 105 + 2 OC. 4.3 Desiccator, containing either actived alumina, fresh magnesium perchlorate or diphosphorus pentoxide as desic- cant. NOTE - Ac
11、tivated alumina should be freshly activated by heating at 300 f 10 “C overnight. 5 Sampling and samples A laboratory sample with a particle size of less than 156 urn shall be used. The sample shall be thoroughly mixed, preferably by mechanical means, immediately before use. 6 Procedure Place a test
12、sample of less than 10 g in the weighing bottle (4.11, previously dried in the laboratory oven (4.21, controlled at 105 ): 2 OC. Dry the sample for 16 h in the oven, controlled at 105 * 2 oc. NOTE - In general, a weighing bottle of diameter not less than 50 mm should be used. However, a smaller bott
13、le may be used, on the con- dition that the layer density of the sample is not greater than 5 mg/mm*. Close the bottle with a well-fitting stopper and allow it to cool to room temperature (for 30 to 45 mini in the desiccator (4.3). Slightly open the stopper and quickly close it again, then weigh the
14、 stoppered bottle and contents. Preserve the pre-dried test sample in the desiccator in the stop- pered weighing bottle. Take and weigh the test portion quickly in order to minimize reabsorption of moisture. NOTE - If the analytical value is expected to be above 10 %, take and weigh a test portion on the day of pre-drying. Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
