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High surface area cathode assembly, system including the assembly, and method of using same

a cathode and high surface area technology, applied in the field of cathode assemblies, can solve the problems of high current densities, metal recovery from low quality liquid streams, and other than metal deposition and generally undesirable reactions, and achieve the effects of increasing the active area of the cathode, increasing the efficiency of the electrowinning system, and increasing the metal recovery ra

Inactive Publication Date: 2013-06-20
FREEPORT MCMORAN COPPER & GOLD INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a cathode assembly for use in an electrolytic metal recovery process that has a high cathode active area, which increases the efficiency of the system and allows for increased metal recovery rates while maintaining purity of the recovered metal. The technical effects of this invention include improved efficiency and purity of the recovered metal.

Problems solved by technology

Over a certain current density, known as limiting current density, reactions, other than metal deposition and which are generally undesirable, begin to occur.
Thus, although higher current densities may be desirable to achieve higher plating rates, the higher current densities may be problematic.
Another difficulty with traditional electrowinning is metal recovery from low quality liquid streams, such as acid mine drainage, low grade PLS, bleed streams, and remediation streams.
Traditional cathode assemblies may require high current densities to extract metal from low quality streams, which may result in higher energy costs and increased impurities in the deposited metal.
Additionally, traditional electrowinning cell systems are typically large, industrial scale apparatus which operate in permanent locations.
In certain circumstances, removal and transport of metal bearing liquid may create logistic difficulties, and may lead to increased costs and time associated with recovering the metal.

Method used

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Embodiment Construction

[0021]The description of exemplary embodiments of the present invention provided below is merely exemplary and is intended for purposes of illustration only; the following description is not intended to limit the scope of the invention disclosed herein. Moreover, recitation of multiple embodiments having stated features is not intended to exclude other embodiments having additional features or other embodiments incorporating different combinations of the stated features. While these embodiments are described in sufficient detail to enable those skilled in the art to practice the embodiments, it should be understood that other embodiments may be realized and that mechanical and other changes may be made without departing from the spirit and scope of the present disclosure.

[0022]As set forth in more detail below, for a given metal recovery rate, the cathode assembly, system including the assembly, and method of using the assembly and system, in accordance with various embodiments of t...

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Abstract

A cathode assembly, a system including the cathode assembly, and method of using the assembly and system are disclosed. The cathode assembly includes high surface area material to allow efficient recovery of metal at reduced current densities at the cathode, which allows increased rates of metal recovery to be obtained, while maintaining desired properties of the electrowon metal.

Description

FIELD OF INVENTION[0001]The present invention generally relates to cathode assemblies for use in electrolytic metal recovery processes. More particularly, the invention relates to high surface area cathode assemblies for electrolytic recovery of metal, to systems including the cathode assemblies, and to methods of using the cathode assemblies and systems.BACKGROUND OF THE INVENTION[0002]Electrowinning is often used in hydrometallurgical processing of ore to recover metal, such as copper, silver, platinum group metals, molybdenum, zinc, nickel, cobalt, uranium, rhenium, rare earth metals, combinations thereof, and the like from ore. The recovery of metal from ore often includes exposing the ore to a leaching process (e.g., atmospheric leaching, pressure leaching, agitation leaching, heap leaching, stockpile leaching, thin-layer leaching, vat leaching, or the like) to obtain a pregnant leach solution (PLS) including desired metal ions, optionally purifying and concentrating the pregna...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25B11/00C25C1/00C25B9/00
CPCC25C7/02C25C5/02C25C1/12
Inventor SANDOVAL, SCOT P.CLAYTON, CASEY J.MORGAN, JASON M.BRYCE, CHARLES L.WATERMAN, BRETT
Owner FREEPORT MCMORAN COPPER & GOLD INC
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