Abstract
	As in other metallurgical processes, a better yield per space and time unit at lower specific energy consumption is desirable in precipitation and refining electrolysis. In this context, the conditions of mass transfer in the electrolyte and at the phase boundaries electrodes-electrolyte are of primary importance. They are controlled by the current density and working temperature but also the flow conditions in the electrolyte.
	Today, Laser-Doppler anemometry allows their measurement free of influences caused by induced probes even in partially coloured electrolyte solutions. This article reports first results of the measurement of flow conditions in copper electrorefining cells and their dependence on current density.