Abstract: To permit continuous roll-off or stripping of metal in form of a ribbon, tape or foil from a rotating cathode roller or drum (3, 43) within a metal ion containing solution, the cathode roller or drum is cooled during operation and the solution of the processing liquid contains a halogen compound or a sulfur compound, for example zinc chloride, to obtain zinc in form of a ribbon, tape or foil. The cathode roller or drum is at least partly, and for example entirely submerged in the ion containing processing solution, rotatable about a horizontal or vertical axis, and the anodes (4, 44) are separated from the ion containing solution by a separating diaphragm or ion exchange membrane.

Abstract: An electrolytic cell, for demetallization of a solution containing metal ions, has a hydrogen sensor connected to a control and monitoring unit which controls the intensity of current applied across the cell's electrodes. Whenever the hydrogen concentration above the solution surface in the cell reaches a predetermined undesirably high level, the control unit makes a stepwise reduction in the applied current. This stepwise reduction continues until the ions in the solution are depleted to a predetermined level, at which point the solution is replaced.

Abstract: An electrochemical cell for electrolytic treatment of aqueous solutions, particularly for cyanide detoxification or oxidation, has a solution container with a cell housing mounted on it, in which an electrode stack is located. Solution is delivered to the cell housing in the region of its housing bottom by a circulation device, and after passing through the electrode stack by an overflow over the side walls of the cell housing, is delivered to a cascadelike drain container with its own overflow for the sake of degassing; after passing through the second overflow, the now largely degassed solution is returned to the solution container and recirculated. The invention provides a compact structural form with a pressure-free recirculation system and simple maintenance of the electrode stack or individual electrodes.

Abstract: An electro-chemical cell suitable for chromic acid regeneration or the electro-chemical treatment of methane sulphonic acid has several plate shaped bipolar electrodes which are spaced by means of frames to form an electrolyte space between every two adjacent electrodes. The electrolyte spaces are closed at the sides and at the bottom so they are impermeable to liquids and adjacent bipolar electrodes are electrically insulated against each other. The electrodes are tightly secured against the frame by means of hose-shaped sealing elements that can expand if internal pressure is applied, these sealing elements each being located in a fixed position in a U-shaped groove inside the frames. The cell is not sealed at the liquid surface of the electrolyte, however, it can be equipped with a cover, depending on the application. In order to remove an electrode, the sealing pressure is decreased by means of a pressure reduction in the interior of the sealing elements.

Abstract: An electrode arrangement for electrolytic purposes has a plurality of cathodes and one or a few anodes, so that an advantageous surface ratio between cathodes and anodes results. The cathodes, provided with openings, are embodied as plates and are arranged parallel at distances from each other, the cathodes being supported in a support device with an electrically insulating surface.

Abstract: In order to prevent mechanical damage to electrode surfaces and to facilitate easy swapping out of immersible electrodes for inspection or replacement, an electrode element for an electrolysis cell for electrolytic precipitation of metals from a liquid containing metal ions has a frame (1) provided with parallel side sections (2, 3) of electrically insulating plastic. Each element includes at least one conduit (13) for supplying a liquid ion conductor and at least one conduit (16) for the removal of this liquid ion conductor. There is at least one planar active part is disposed between the conduits to serve as an electrode (7), along which the ion conductor flows. The active surface of the electrode (7) is covered by an ion exchange diaphragm (20). The electrode element is adapted for partial dipping, up to a predetermined immersion line (17), in the liquid. The electrode (7) is removably supported in the side sections (2, 3) of the frame (1).

Abstract: Cathode includes a drum at least partly immersed in a metal ion solution and a flexible metallic band passing around the drum and driven by a drive roller outside the solution, both the cathode drum and the drive roller having axes which form an angle with a surface normal of the solution ranging between 20 and 70 degrees.