BS ISO 10143:2019,Carbonaceous materials for the production of aluminium – Calcined coke for electrodes. Determination of the electrical resistivity of granules.BS ISO 10143:2019 pdf free download.
BS ISO 10143:2019 specifies a method for the determination of the electrical resistivity of granular carbon (calcined or graphitized) used in the manufacture of carbon electrodes for the production of aluminium.
The measurement of electrical resistivity assists in assessing the extent of coke calcination. The electrical resistivity of the coke aggregate will influence the electrical resistivity of the coke electrodes made from it.
In general, a more highly calcined coke will have a lower electrical resistivity if other factors, such as grain size, are similar.
A test portion of the granular carbon is placed in a cylindrical holder which has electrical contacts at the top and bottom A fixed pressure is applied to the test portion to ensure good electrical contact and a fixed, constant direct current is applied. The voltage drop and the height of the column of granules are measured and the electrical resistivity is calculated.
7.3 Determination
Pour the test portion into the sample holder, insert the plunger and place the assembly in the test machine.
Apply a pressure of 3 MPa to the test portion and after 30 s record the voltage drop and the height of the column of granules.
Reproducibility
The difference between the values of the average of duplicate determinations obtained by two laboratories using this method for the analysis of the same laboratory sample is not expected to exceed the reproducibility limit R=5%.
The difference between the values of duplicate determinations, carried out in rapid succession by the same operator using the same apparatus on granules taken from the same test sample, shall not exceed the repeatability limitr= 3%.

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