ISO 10143:2019 pdf download

ISO 10143:2019 pdf download.Carbonaceous materials for the production of aluminium – Calcined coke for Determination of the electrical resistivity of granules
1 Scope
This document specifies a method for the determination of the el ectrical resistivity of gra nul ar carbon (calcined or grap hiti zed) used in the manufacture of ca rbo n electrodes for the production of alum inium. The measurement of electrical resistivity assists in assessing the extent of coke calcination. The electr ical resistivity of the coke aggregate will influence the el ectrical resistivity of the coke electrodes made from it. In a more highly calcined coke will have a lower el ectrical resistivity if other factors, such as grain size, are sim ilar.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest ed iti on of the referenced document (including any am endments ] applies.
ISO 6375, Carbonaceous materials for the production of aluminium – Coke for electrodes – Sampling
ISO 6997, Carbonaceous materials for the production of aluminium – Calcined coke – Determination of apparent oil content – Heating method
ISO 8723, Carbonaceous materials for the production of aluminium – Calcined coke – Determination of oil content – Method by solvent extraction
ISO 11412, Carbonaceous materials for the production of aluminium – Calcined of water content
3 Terms and definitions
No terms and definitions are list ed in this document.
ISO and IEC maintain terminological databases for use in standardizat i on at the following addresses :
ISO Online browsing platform: available at
IEC Electropedia: available at http;J.Lwww.electropedia.org,L
4 Principle
A test portion of the granular carbon is placed in a cyl ind rical holder which has electrica l contacts at the top and bottom. A fi xed pressure is applied to the test portion to ensure good elect rical contact and a fixed, constant direct current is applied. Th e voltage drop and the height of the column of granules are measured and the elect rical r esistivity is calculated.
5 Apparatus
Ordinary laboratory apparatus, plus the following:
5.1 Sampl e hold er and plunger , with removable base for cleaning as shown in
5.2 Length – measuring device , capable of movement of the compression plunger to± 0,1 mm.
5.3 Pl a stic re fer e nc e cylind er, wi th a height of 22 mm ± 0,01 mm an d a diameter of 25 mm, used for calibrating the length-measuring device
5.4 Test machine , capable of applying a constant pressure of 3 % to the plunger (. S .. l ), giving a ve locity to the plunger of not more than 10 mm/s, and with a centering device for the sample holder
5.5 Power supply , capable of providing a const ant direct current of 1 A± 0,002 A.
5.6 Voltmeter . capable of measuring to the nearest± 0,01 mV.
5.7 Oven, capable of being maintained at fo r 12 h.