Abstract: An electrolytic process and apparatus for the production of copper cathodes from acid solutions of copper sulphate by a direct electro-deposition of said metal on lead bipolar electrodes arranged "in series" into electrolyzers consisting of lead electrodes (3) juxtaposed to special frames (1) adapted to define together with said electrode electrolytic cells, absolutely separated from each other and adapted to prevent any formation of shunt currents. The alternating succession of the frames (1) and electrodes (3) is carried by a support structure and is then compressed at the ends thereof by means of two heads and is hermetically sealed by means of packing means interposed between a frame and the adjacent ones. The process can be also applied to other metals other than the copper.