Patent EA-001476-B1 (EA)
Title: Electrode for electrolytic refining or electrowinning and method for producing the same
Inventor: MARTTILA TOM
IPC: C25C7/02
Filed: 1998-09-24
Abstract: 1. An electrode for electrolytic refining or electrowinning, said electrode (1, 21, 41) being provided with a hanger bar (3, 23, 43) attached to the edge of one plate-like mother plate, and the edges (4, 5, 6; 24, 30, 31; 44, 49, 50) of said electrode, apart from the edge to which the hanger bar is fastened, being protected with an edge strip (11, 12, 13; 29, 32, 33; 48, 51, 52) made of some insulating material, in which electrode at least part of the edge strips is at least partly placed in a groove (7, 25, 45) made in the electrode edge, characterized in that at least in one electrode edge (4, 5, 6; 24, 30, 31; 44, 49, 50), there is formed a groove (7, 25, 45) for the electrode edge strip (11, 12, 13; 29, 32, 33; 48, 51, 52) made of some insulating material, the front end of said groove, located at the electrode edge edge (4, 5, 6; 24, 30, 31; 44, 49, 50), being essentially equal in width with the rear end (10, 28, 53) of the groove placed inside the electrode. 2. An electrode according to claim 1, characterized in that at least the edge (5, 24, 44) opposite to the electrode hanger bar is provided with a groove (7, 25, 45) for the edge strip. 3. An electrode according to claim 1 or 2, characterized in that both the edge (5, 24, 44) opposite to the hanger bar and the edges (4, 6; 32, 33; 49, 50) adjacent to the electrode hanger bar are provided with a groove (7, 25, 45) meant for the edge strip. 4. An electrode according to any of the preceding claims 1 - 3, characterized in that the width of the groove (7, 25, 45) made in the electrode edge has equal walls in the part located in between the groove ends (4, 5, 6; 10), (24, 30, 31; 28) and (44, 49, 50; 53). 5. An electrode according to any of the preceding claims 1 - 3, characterized in that the groove (7, 25, 45) made in the electrode edge is wider in the area located in between the groove ends (4, 5, 6; 10), (24, 30, 31; 28) and (44, 49, 50; 53). 6. An electrode according to any of the preceding claims 1 - 3, characterized in that the groove (7, 25, 45) made in the electrode edge is narrower in the area located in between the groove ends (4, 5, 6; 10), (24, 30, 31; 28) and (44, 49, 50; 53). 7. A method for producing the electrode according to claim 1, characterized in that at least in the groove (7, 25, 45) made in the edge (5, 24, 44) opposite to the electrode hanger bar, there is formed by means of extrusion an edge strip (12, 29, 48) to be placed at least partly in said groove. 8. A method according to claim 7, characterized in that both in the edges (4, 6; 30, 31; 49, 50) adjacent to the electrode hanger bar and in the edge (5, 24, 44) opposite to the hanger bar, there is by extrusion formed an edge strip (11, 12, 13; 29, 32, 33; 48, 51, 52) made of some insulating material to be placed at least partly in the groove. 9. A method for producing an electrode according to claim 1, characterized in that at least in the groove (7, 25, 45) formed in the edge (5, 24, 44) opposite to the electrode hanger bar, there is formed an edge strip (12, 29, 48) made of some insulating material, to be placed at least partly in the groove, by installing an essentially wedge-like edge strip in the groove, and that the groove wails (8, 9; 26, 27; 46, 47) are compressed towards the edge strip in order to make the edge strip stay in place in the groove. 10. A method according to claim 9, characterized in that both in the edges (4, 6; 30, 31;49, 50) adjacent to the electrode hanger bar and in the edge (5, 24, 44) opposite to the hanger bar, there is formed an edge strip (11, 12, 13; 29 32, 33; 48, 51, 52) made of some insulating material to be placed at least partly in the groove (7, 25, 45) by installing an essentially wedge-like edge strip in the groove, and that the groove walls (8, 9; 26, 27; 46, 47) are compressed towards the edge strip in order to make the edge strip (11, 12, 13; 29, 32, 33; 48, 51, 52) stay in place in the groove. 11. A method according to any of the claims 7 - 10, characterized in that both in the edges(4, 6; 30, 31;49, 50) adjacent to the electrode hanger bar and in the edge (5, 24, 44) opposite to the hanger bar, there is provided an essentially uninterrupted protection made of some insulating material.