Method of producing metal powder
AssigneeNational Development Research Corporation
InventorFrank Stanley Holland
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Abstract
A metal powder e.g. copper or zinc, is produced from a dilute aqueous solution of the metal by subjecting the dilute aqueous solution to electrolysis in a cell having a rotating cylinder cathode and in accordance with the equation: I = KCV.sup.x where I is the current density, K is a constant for a given cell, C is the concentration of metal ion in aqueous solution, V is the peripheral velocity of the rotating cylinder cathode and x = 0.7 to 1.0. A diaphragm cell is preferably used. Dilute aqueous solutions treated include mining liquors and viscose rayon plant effluent. This invention relates to metals and is particularly concerned with the recovery or extraction of metals in powder form by electrolytic means.
Claims32
A method of producing a metal powder from a dilute aqueous solution of the metal which solution has a low concentration of the metal ion, said method comprising the steps of subjecting the dilute aqueous solution of the metal to electrolysis in a cell having a rotating cylinder cathode, the current density of the cathode being proportional to the peripheral speed of the rotating cylinder cathode to the power of a number between 0.7 and 1.0 whereby the metal is deposited as a powder on the cathode, and recovering metal powder from the cathode.
Dependencies are inferred from the claim text.