A kind of preparation method of rolling anode for non-ferrous metal electrowinning

A non-ferrous metal, electrowinning technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of shortened anode plate life, random metallographic structure, and small number of grain boundaries, etc., to improve electrocatalytic activity, improve The effect of electrochemical performance

Active Publication Date: 2017-07-28
KUNMING HENDERA SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Pb-based alloy anodes have the following disadvantages: 1) Oxygen evolution overpotential is high, resulting in a large amount of useless energy consumption
The shortcomings of the existing process are: 1) Since the surface of the anode material forms a crystal structure with uniform orientation, slender shape, and a small number of grain boundaries in the rolling direction, the surface of the anode material lacks corrosion centers, and it is difficult to quickly form an excellent bonding force. PbO 2 Oxidation product protective layer
2) The surface of the calendered anode plate is smooth, and the anode slime cannot adhere to the anode plate surface well during the electrolysis process, and most of them fall off in flakes, so that the fresh lead surface is exposed to the electrolyte, and the anode plate cannot be well protected. Shorten the life of the anode plate, and also lead to high lead content in the precipitated zinc sheet, reducing product quality
3) The metallographic structure of the rough plate before rolling is relatively random, and it is not well regulated, so that the metallographic phase of the anode plate alloy obtained after rolling is not ideal, and it may also lead to deterioration of the mechanical properties of the Pb-based alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, the lead-silver alloy is calculated by mass percentage; Pb=99.5%; Ag=0.5%;

[0033] (1) cast lead-silver alloy in resistance furnace by conventional method;

[0034] (2) Place the lead-silver alloy ingot obtained in step (1) in a resistance furnace, and carry out rolling pretreatment. The process conditions are: under an argon protective atmosphere, keep warm at 300°C for 30min, and heat at 3°C / min Cool to room temperature at the rate of 2h, let it stand for 2h; heat to 240°C, keep warm for 45min, and naturally cool to room temperature;

[0035] (3) rolling: the alloy obtained in step (2) is rolled by a two-roll or four-roll rolling mill;

[0036] (4) Electric field aging treatment: place the anode plate obtained in step (3) in an electric field aging device, conduct electric field aging at 80° C. for 40 minutes, and the electric field strength is 2 KV / cm. ,

[0037] (5) In the zinc electrodeposition system (Zn 2+ 50g / L, H 2 SO 4 160g / L, temper...

Embodiment 2

[0048] In this embodiment, the lead-silver alloy is calculated by mass percentage; Pb=99.6%; Ag=0.4%;

[0049] (1) cast lead-silver alloy in resistance furnace by conventional method;

[0050] (2) Place the lead-based alloy ingot obtained in step (1) in a resistance furnace for pre-calendering. The process conditions are: under an argon protective atmosphere, keep it warm at 320°C for 30min, and heat it at 10°C / min. Speed ​​cooling to room temperature, let stand for 2h;

[0051] (3) rolling: the alloy obtained in step (2) is rolled by a two-roll or four-roll rolling mill;

[0052] (4) Electric field aging treatment: the anode plate obtained in step (3) was placed in an electric field aging device, and the electric field aging was performed at 100° C. for 60 minutes, and the electric field strength was 4 KV / cm. ,

[0053] (5) In the zinc electrodeposition system (Zn 2+ 50g / L, H 2 SO 4 160g / L, temperature 30 ℃) application, compared with traditional lead-silver alloy anode...

Embodiment 3

[0062] In this embodiment, the lead-silver-rare earth alloy is calculated by mass percentage; Pb=99.5%, Ag=0.4%, rare earth=0.1%;

[0063] (1) Under nitrogen protective atmosphere, melt lead liquid in electromagnetic furnace, add lead rare earth master alloy and metallic silver, obtain lead-silver-rare earth alloy;

[0064] (2) Place the lead-based alloy ingot obtained in step (1) in a resistance furnace for pre-calendering. The process conditions are: under a nitrogen protective atmosphere, keep warm at 280°C for 60min, and cool at a rate of 10°C / min Let stand for 1 hour at room temperature; heat to 260°C, keep warm for 30 minutes, and cool to room temperature naturally;

[0065] (3) rolling: the alloy obtained in step (2) is rolled by a two-roll or four-roll rolling mill;

[0066] (4) Electric field aging treatment: the anode plate obtained in step (3) was placed in an electric field aging device, and the electric field aging was performed at 100° C. for 60 minutes, and the...

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Abstract

The invention relates to a preparation technology of a rolled anode for electrowinning of nonferrous metals, belonging to the field of hydrometallurgy of nonferrous metals. The present invention comprises the following steps: (1) using the cast lead-based alloy as raw material, performing calendering pretreatment on the raw material; the calendering pretreatment is to place the lead alloy ingot in a resistance furnace, and perform diffusion annealing and / or Metamorphic heat treatment; (2) calendering, that is, rolling the pretreated alloy through a two-roll or four-roll mill; (3) electric field aging treatment, that is, placing the rolled anode plate in an electric field aging device for aging treatment. The rolled anode prepared by the present invention has good mechanical properties, corrosion resistance and electrochemical properties, and can replace the lead alloy rolled anode of the original process; it can be applied to the electrowinning process of non-ferrous metals, and can reduce the cell voltage, Reduce anode cost and prolong the service life of anode.

Description

technical field [0001] The invention relates to a method for preparing a rolled anode for nonferrous metal electrowinning, belonging to the field of nonferrous metal hydrometallurgy. Background technique [0002] In the wet extraction process of non-ferrous metals, the electrodeposition process is an important process. Lead-based anodes are widely used as insoluble anodes in the hydrometallurgical electrodeposition industry because they can form an oxide protective film with good conductivity on the surface under the conditions of high current density and high sulfuric acid concentration. However, Pb-based alloy anodes have the following disadvantages: 1) The oxygen evolution overpotential is high, resulting in a large amount of useless energy consumption. Taking metal Zn as an example, the energy consumption of the hydrometallurgy electrowinning process is about 3200kWh / t-Zn, and the lead-silver alloy anode is used, and the useless power consumption is nearly 1000kWh / t-Zn,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C7/02C22F1/12
Inventor 蒋良兴于枭影刘芳洋吕晓军赖延清
Owner KUNMING HENDERA SCI & TECH
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