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Calculation of cathode current density (cross post from Corrosion Engineering)

Calculation of cathode current density (cross post from Corrosion Engineering)

Calculation of cathode current density (cross post from Corrosion Engineering)

(OP)
Dear All,

[Cross posting from Corrosion Engineering section as I didn't get any replies there]

I would like to verify my calculation of cathode current density in an electro-refining cell.
It is refining cast copper anodes from scrap copper in a CuSO4/H2SO4 bath.
Each tank has a set of impure anodes and copper cathodes forming cells in parallel.

The current passing into a cell is 134A, surface area of one side of cathode is 0.54m^2

My current density calculation is below:
*Each cathode receives copper from anodes on both sides, so according to my understanding the current passing through one side of cathode is I = 134A/2 = 67A
*As this current passes through a single side of cathode, the area,A = 0.54m^2
From this I get the current density, J=I/A = 67/0.54 = 124 A/m

This value I get is roughly half the typical industry values which are in the range of 250 - 280 A/m^2
Am I doing the calculation wrong, is there a industry specific calculation for "cathode current density"

Thank you all in advance!

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