Method and apparatus for electrowinning copper using the...

Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Preparing single metal

Reexamination Certificate

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C205S575000, C205S579000, C204S220000, C204S22400M, C204S232000, C204S237000, C204S242000, C204S267000, C204S269000, C204S275100, C204S281000

Reexamination Certificate

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07368049

ABSTRACT:
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 and a flow-through anode, such as, for example, a dimensionally stable carbon, carbon composite, metal-graphite, or stainless steel anode. 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/m2), 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.

REFERENCES:
patent: 2005/0023151 (2005-02-01), Sandoval et al.

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