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

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

CN105040036BActive Publication Date: 2017-07-28KUNMING HENDERA SCI & TECH
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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

Patent Timeline
28 Jul 2017
Publication
CN105040036B
IPC
C25C7/02; C22F1/12
Inventors
蒋良兴; 于枭影