Method and apparatus for electrowinning copper using the ferrous/ferric anode reaction
View Patent ↗The present invention relates, generally, to a method and apparatus for electrowinning metals, and more particularly to a method and apparatus for copper electrowinning using the ferrous/ferric anode reaction. In general, the use of a flow-through anode—coupled with an effective electrolyte circulation system—enables the efficient and cost-effective operation of a copper electrowinning system employing the ferrous/ferric anode reaction at a total cell voltage of less than about 1.5 V and at current densities of greater than about 26 Amps per square foot (about 280 A/m 2 ), and reduces acid mist generation. Furthermore, the use of such a system permits the use of low ferrous iron concentrations and optimized electrolyte flow rates as compared to prior art systems while producing high quality, commercially saleable product (i.e., LME Grade A copper cathode or equivalent), which is advantageous.
1. A system for electrowinning copper from a copper-containing electrolyte, comprising:
an electrowinning cell comprising at least one flow-through anode, at least one plate cathode, a floor, and a ceiling; and
a plurality of injection holes located on at least one of said floor and said ceiling;
wherein said copper-containing electrolyte comprises solubilized ferrous iron.
2. The system according to claim 1 , further comprising an electrolyte flow manifold.
3. The system according to claim 1 , wherein said at least one flow-through anode further comprises a metallic mesh.
4. The system according to claim 2 , wherein said electrolyte flow manifold is configured to provide electrolyte flow through said plurality of injection holes.
5. The system according to claim 3 , wherein said metallic mesh encases at least one of said plurality of injection holes.
6. The system according to claim 3 , wherein said metallic mesh further comprises an electrochemically active coating.
7. The system according to claim 1 , wherein said at least one plate cathode has an active surface area.
8. The system according to claim 1 , wherein said electrowinning cell is configured to be operated at a predetermined cell voltage and at a predetermined current density, wherein said cell voltage is less than about 1.5 Volts and wherein said current density is greater than about 26 amperes per square foot of active plate cathode.