Patent ID: 8551306

Claim:
A permanent cathode to be used as electrode in the electro-refining and/or recovery of metals, such as copper, zinc, cobalt or nickel, wherein the permanent cathode comprises a planar mother plate that is made of metal and comprises two sides; wherein the mother plate comprises an edge, which at least partly surrounds the metal plate; and wherein the edge comprises a groove portion provided with a groove, wherein: the groove portion comprises at least one bridging section for joining together, over the groove portion of the edge of the metal plate at the said at least one bridging section, the cathode metal halves, which are formed on the sides of the mother plate in the electro-refining of the metals, the groove portion is dimensioned and/or designed such that the cathode metal halves that are formed in electrorefining or electrowinning of metal on the sides of the mother plate are configured to at least partly be connected over the groove portion of the edge of the mother plate, and said at least one bridging section of the groove portion is dimensioned and/or designed such that the connection between the cathode metal halves at a bridging section of the groove portion is a stronger connection between the cathode metal halves over the edge of the mother plate than exists between the cathode metal halves over the edge of the mother plate at other parts of the groove portion.