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1、International Standard 8723 INTERNATIONAL ORGANIZATION FOR STANDARDlZATIONWEYHAPOHAR OPTAHH3Allfl fl0 CTAHmH3AUHHRGANISATlON INTERNATIONALE DE NORMALISATION Carbonaceous materials for the production of aluminium - Calcined coke - Determination of oil content - Method by solvent extraction Produits c
2、arbonh utilishs pour Ia production de laluminium - Coke calctnh - D ml is the mass, in grams, of the crucible supported by the jar, containing the test portion before extraction; m2 is the mass, in grams, of the crucible supported by the jar, containing the test portion after extraction and drying.
3、Carry out at least two value. determinations and report the mean 8.2 Precision (sec ISO 5725, sub-clause 3.1) Nine laboratories from nine the inter-laboratory tests. different countries have out m (mean) :0,60% (mlm) r (repeatability) :0,023 % tmlml R (reproducibility) :0,050 % (mlml 9 Test report T
4、he test report shall include the following particulars: a) an identification of the Sample; b) the reference of the method used; c) the results and the method of expression used; d) any unusual features noted during the determination; e) any operations not included in this International Stan- dard o
5、r in the International Standards to which reference is made, or regarded as optional. -,-,- Approximate dimensions in millimetres I 0 -4 m l I lnternal vent Cylindrical glass funnel(5.2.1) Fritted disk Joints Glass extraction crucible (5.2.2) Fritted disk 2.3) w To the vacuum device (5.5) - Bchner flask (5.2.4) Figure - Extraction apparatus 3 This page intentionally left blank -,-,- This page intentionally left blank -,-,- This page intentionally left blank