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The characteristics of mass transport and cathode deposit in a pilot‐plant size magnetoelectrolytic reactor employing an anisotropic inhomogencous magnetic field are analyzed. It is shown that the behaviour of the reactor, especially the deposition pattern, is strongly linked to the distribution of the magnetic flux density.

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The effect of the inclination angle between opposite electrodes, and between parallel electrodes and the vertical and the horizontal axis, on natural convectivc ionic mass transfer and deposition pattern at inclined vertical plate electrodes was studied in a pilot‐plant scale magneoelectrolytic reactor. The non‐uniform magnetic field with a maximum gradient at the centre of the reactor was generated by means of solenoid winding of water‐cooled copper pipes and high‐current cables. Copper was deposited from an aqueous solution of cupric sulfate and at ambient temperatures on a stainless steel cathode placed at various angles in the horizontal and vertical direction with respect to a stainless steel anode of identical size. Mass transfer rates, inclination angle and bubble pattern are strongly interrelated. The rate of gas generation at both electrodes as well as induced magnetohydrodynamic turbulence determine the extent of locally strong mixing in the cell. The extent and position of cathode oxide formation, due to anodically generated oxygen is influenced by the distribution of the magnetic and the electric field in the cell.