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Method for preparing novel energy conservation inert anode material for zinc electrodeposition

An inert anode, zinc electrowinning technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of cathode product quality decline, short service life, low current efficiency, etc., to reduce the voltage of the electrolytic cell and reduce the production cost. , the effect of improving the current efficiency

Active Publication Date: 2009-01-14
晋宁理工恒达科技有限公司
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AI Technical Summary

Problems solved by technology

[0002] In the process of wet extraction of zinc, copper, nickel, cobalt, manganese, chromium and other metals, lead and lead alloys are still used as anode materials at present. The disadvantages are: high cell voltage (3.4-3.8V), low current efficiency (75- 88%), high energy consumption in the electrowinning process (3400-4200 degrees / ton of zinc), short service life of the anode (0.5-1 year), easy dissolution of anode lead into the cathode product, resulting in a decline in the quality of the cathode product
[0003] 1. Improved lead-silver binary and multiple alloy anodes: mainly including lead-silver (Pb-Ag), lead-arsenic (Pb-As), lead-calcium (Pb-Ca), lead-mercury (Pb-Hg ), lead-chromium (Pb-Cd), lead-titanium (Pb-Ti), lead-calcium-barium (Pb-Ca-Ba), lead-silver-calcium (Pb-Ag-Ca), lead-silver- Strontium (Pb-Ag-Sr), lead-calcium-tin (Pb-Ca-Sn) and lead-silver-calcium-tin (Pb-Ag-Ca-Sn), etc., but still have short service life and high energy consumption and easy to pollute cathode products and other disadvantages
[0004] 2. Titanium-based surface coating / plated dimensionally stable anode: This type of anode is based on titanium Ti, and the surface is coated with precious metals or their oxides, but this anode has the following disadvantages: (1) The titanium substrate is used, and the cost of the electrode is high; (2) Due to the dissolution of the noble metal coating and the passivation of the matrix titanium in the electrolytic production, the life of the electrode is short; (3) In the electrowinning solution, the deposition of impurity ions, such as manganese, in the oxide state on the anode after oxidation is reduced The effect of coating the precious metal layer
However, this anode material has shortcomings in the production process: the production process is too long and the production energy consumption is high
Processes such as galvanizing, lead plating, and rinsing will produce a large amount of waste liquid and cause serious environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The inert anode material is pulse-electrodeposited on the fence-shaped pure aluminum plate. The conductive beam is made of copper-clad aluminum plate or aluminum plate. The electrical contact part is a 50×50×8mm copper block. The size is 20×60mm. The aluminum substrate is dipped in zinc after degreasing treatment, and the process flow is as follows:

[0019] Electrodeposition of alkaline lead-tin alloy, electrodeposition of lead-lead dioxide-titanium diboride-ceria-polyaniline composite coating Pb-PbO 2 -TiB 2 -CeO 2 -PANI, finally get lead-lead dioxide-titanium diboride-ceria-polyaniline composite coating Pb-PbO on the aluminum substrate 2 -TiB 2 -CeO 2 -PANI energy saving inert anode material.

[0020] The process conditions of the electrodeposited alkaline lead-tin alloy: lead oxide (PbO) 90~120g / L; sodium hydroxide (NaOH) 10~20g / L; sodium potassium tartrate (C 6 h 4 o 4 NaK)90~120g / L; sodium stannate (Na 2 SnO 3 )2~10g / L; temperature 20~30℃; cathode curre...

Embodiment 2

[0023] The inert anode material is pulse-electrodeposited on the fence-shaped pure aluminum plate. The conductive beam is made of copper-clad aluminum plate or aluminum plate. The electrical contact part is a 50×50×8mm copper block. The size is 22×45mm. The aluminum substrate is dipped in zinc after degreasing treatment, and the process flow is as follows:

[0024] Electrodeposition of alkaline lead-tin alloy, electrodeposition of lead-lead dioxide-titanium diboride-ceria-polyaniline composite coating Pb-PbO 2 -TiB 2 -CeO 2 -PANI, finally get lead-lead dioxide-titanium diboride-ceria-polyaniline composite coating Pb-PbO on the aluminum substrate 2 -TiB 2 -CeO 2 -PANI energy saving inert anode material.

[0025] The process conditions of the electrodeposited alkaline lead-tin alloy: lead oxide (PbO) 100~150g / L; sodium hydroxide (NaOH) 20~40g / L; sodium potassium tartrate (C 6 h 4 o 4 NaK) 100~150g / L; sodium stannate (Na 2 SnO 3 )15~30g / L; temperature 30~60℃; cathode c...

Embodiment 3

[0028] The inert anode material is pulse-electrodeposited on the fence-shaped pure aluminum plate. The conductive beam is made of copper-clad aluminum plate or aluminum plate. The electrical contact part is a 50×50×8mm copper block. The size is 32×56mm. The aluminum substrate is dipped in zinc after degreasing treatment, and the process flow is as follows:

[0029] Electrodeposition of alkaline lead-tin alloy, electrodeposition of lead-lead dioxide-titanium diboride-ceria-polyaniline composite coating Pb-PbO 2 -TiB 2 -CeO 2 -PANI, finally get lead-lead dioxide-titanium diboride-ceria-polyaniline composite coating Pb-PbO on the aluminum substrate 2 -TiB 2 -CeO 2 -PANI energy saving inert anode material.

[0030] The process conditions of the electrodeposited alkaline lead-tin alloy: lead oxide (PbO) 90~150g / L; sodium hydroxide (NaOH) 10~40g / L; sodium potassium tartrate (C 6 h 4 o 4 NaK)90~150g / L; sodium stannate (Na 2 SnO 3 )2~40g / L; temperature 20~60℃; cathode curre...

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Abstract

The invention relates to a novel energy conserving inert anode material preparation method used for zinc galvanic deposition. The method adopts a multi-pulse galvanic deposition method to prepare and obtain lead-lead dioxide-titanium boride-cerium dioxide-polyanion composite plating layer (Pb-PbO2-TiB2-CeO2-PAN) energy conserving inert anode material on the aluminum base body, and when the composite electrode material is uaded in the metal galvanic deposition, a compact film layer is formed on the anode surface, to cause the anode to be in a non-molten state; the adoption of the composite electrode can obviously reduce the voltage of the galvanic deposition cell, and the electric consumption is reduced; simultaneously the electroplating solution cost of the invention is low, the equipment investment is less, the land occupation is less, and the effect is rapid; and the cell voltage can be reduced by 0.2 to 0.5V when zinc galvanic deposition is performed, and the current efficiency is improved by 1 to 3 percent.

Description

technical field [0001] The invention relates to a composite material used in the field of metal surface treatment, in particular to a preparation method of a novel energy-saving inert anode material for zinc electrowinning. Background technique [0002] In the process of wet extraction of zinc, copper, nickel, cobalt, manganese, chromium and other metals, lead and lead alloys are still used as anode materials at present. The disadvantages are: high cell voltage (3.4-3.8V), low current efficiency (75- 88%), high energy consumption in the electrowinning process (3400-4200 degrees / ton of zinc), short service life of the anode (0.5-1 year), easy dissolution of anode lead into the cathode product, resulting in a decline in the quality of the cathode product. In order to reduce the power consumption of zinc, copper, nickel, cobalt, manganese, chromium, etc. and prevent the pollution of cathode products by anode lead, in-depth research and development have been carried out on the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C7/02C25C1/16
Inventor 郭忠诚郭忠玉
Owner 晋宁理工恒达科技有限公司
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