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Energy-saving anode for non-ferrous metal electrodeposition

A non-ferrous metal, electrowinning technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of serious lead pollution, high energy consumption, high anode oxygen evolution overpotential in cathode products, and achieve lower real current density, preparation Low cost and the effect of reducing oxygen evolution overpotential

Inactive Publication Date: 2008-08-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of high oxygen evolution overpotential, high energy consumption and serious lead pollution in cathode products in the electrowinning process of nonferrous metals, the present invention provides an energy-saving anode for nonferrous metal electrowinning with a new structure. The anode of this type of structure has a low anode Overpotential, corrosion resistance, long life, light weight, easy manufacture and sufficient strength

Method used

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Embodiment 1

[0013] Such as figure 1 As shown, when a frame structure is used as a copper electrowinning anode, the conductive metal substrate is pure Pb with a thickness of 1mm; the porous metal layer is a Pb-Ca-Sn alloy with a thickness of 0.5mm, a porosity of 10%, and a pore diameter of 0.1-0.2mm, the Ca content is 0.12wt.%, and the Sn content is 1wt.%. The conductive metal substrate is metallurgically bonded to the porous metal layer to eliminate contact resistance. The anode of this structure is combined with the stainless steel cathode, and the composition of the electrolyte is 120g / L H 2 SO 4 , 45g / L Cu 2+ , the temperature is 25±0.5℃, the current density is 250A / m 2 When electrolyzing under the same conditions, the oxygen evolution overpotential of the anode is 600mv, which is about 60mV lower than the oxygen evolution overpotential of the Pb-based alloy anode currently used in industry.

Embodiment 2

[0015] Such as figure 2 As shown, when a sandwich structure is used as a zinc electrodeposition anode, the conductive metal substrate is a Pb-Ag alloy with a thickness of 3mm and an Ag content of 0.3wt.%; the porous metal layers on both sides are Pb-Ag-Ca-Sr The elemental alloy has a thickness of 2mm, a porosity of 50%, a pore diameter of 0.7-0.9mm, and contents of Ag, Ca, and Sr of 0.3wt.%, 0.03wt.%, and 0.03wt.%, respectively. The conductive metal substrate is metallurgically combined with the porous metal layers on both sides to eliminate contact resistance. The anode of this structure is combined with the aluminum cathode, and the composition of the electrolyte is 160g / L H 2 SO 4 , 60g / L Zn 2+ , the temperature is 35±0.5℃, the current density is 500A / m 2 During electrolysis under the same conditions, the oxygen evolution overpotential of the anode is 860mv, which is about 90mV lower than the oxygen evolution overpotential of the Pb-based alloy anode currently used in ...

Embodiment 3

[0017] Such as image 3 As shown, when the grid structure is used as a manganese electrowinning anode, the metal conductive plate is a Pb-Sn alloy with a thickness of 6mm and a Sn content of 40wt.%; the porous metal layer is a Pb-Sb-Sn-Ag quaternary alloy , the thickness is 8mm, the porosity is 80%, the pore diameter is 4.1-4.2mm, and the contents of Sb, Sn and Ag are respectively 1wt.%, 38wt.%, 0.8wt.%. The conductive metal substrate is metallurgically bonded to the porous metal layer to eliminate contact resistance. The anode of this structure is combined with the titanium cathode, and the composition of the electrolyte is 120g / L (NH 4 ) 2 SO 4 , 17g / L Mn 2+ , the pH value is 7, the temperature is 40°C, and the current density is 800A / m 2 During electrolysis under the same conditions, the oxygen evolution overpotential of the anode is 980mv, which is about 100mV lower than the oxygen evolution overpotential of the Pb-based alloy anode currently used in industry.

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Abstract

An energy saving anode used in electro-deposition of nonferrous metal is characterized in that the energy saving anode used in electro-deposition of nonferrous metal comprises a metal-conductive base-plate and at least one block of composite structure which is compounded by a metal layer with porous structure, wherein the structure is frame type, sandwich type and slab lattice type. The energy saving anode not only can effectively reduce true current density of the anode in electro-deposition of the nonferrous metal, reduce overpotential for oxygen evolution of the anode and lower energy consumption, but also can reduce the quality of the anode, reduce the creep deformation and the deformation of the anode, form a more dense oxydic film on the surface, reduce the corrosion rate of the anode, extend the service length of the anode and improve the quality of the cathode products. The energy saving anode can make a full use of the existing anode without changing the structure of the groove and have no effect to the process flow, and the energy saving anode has low preparing cost and low investment.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, in particular to an anode for non-ferrous metal electrowinning. Background technique [0002] In the hydrometallurgy process of copper, zinc, manganese, nickel, cobalt, chromium and other metals, electrodeposition is the main energy-consuming process of the whole process, and the anode is one of the key components of the electrodeposition process. The choice of its material not only directly affects Power consumption and electrode life also affect the quality of cathode products. In general, electrode materials must meet the following requirements: good electrical conductivity, strong corrosion resistance, good mechanical strength and processability, and good electrocatalysis for electrode reactions. At present, the anodes used in the electrolysis industry include platinum (platinized titanium, sintered platinum) electrodes, lead dioxide electrodes, titanium-based oxide coating electrodes, magneti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C7/02
Inventor 赖延清李劼刘业翔衷水平田忠良将良兴
Owner CENT SOUTH UNIV
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