Method for improving comprehensive performance of lead alloy rolling anode

A comprehensive performance, lead alloy technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of lack of corrosion center on the surface of anode material, deterioration of mechanical properties of Pb-based alloy, and unsatisfactory metallographic phase of anode plate alloy, etc. Corrosion resistance and electrochemical catalytic performance, improving electrocatalytic activity, and the effect of good electrochemical catalytic performance

Active Publication Date: 2017-04-26
KUNMING HENDERA SCI & TECH
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Problems solved by technology

However, lead alloy anodes have a series of disadvantages: 1) Oxygen evolution overpotential is high and useless energy consumption is large
However, there are certain deficiencies in the existing calendered anodes: 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 a bond. Excellent PbO 2 Oxidation product protective layer
2) The large amount of rolling deformation will introduce a large number of dislocations and become corrosion sites, which will easily lead to an increase in corrosion rate and pollute cathode products
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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  • Method for improving comprehensive performance of lead alloy rolling anode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this embodiment, the as-cast lead-based alloy is a Pb-Ag-RE alloy, in terms of mass percentage: Ag=0.3%, Nd=0.08%, and the balance is Pb;

[0036] (1) Cast lead alloy in a resistance furnace according to conventional methods, and the original size of the alloy is 8cm×10cm×12cm;

[0037] (2) Calendering: the Pb alloy obtained in step (1) is rolled by a rolling mill, the rolling temperature is room temperature, and the reduction is 90%, and lubricating liquid is added during the rolling process to lubricate and avoid overheating. After rolling, carry out 42h static aging treatment.

[0038] (3) Surface heat treatment: Heating in a protective atmosphere furnace, the anode plate obtained in step (2) is placed in the furnace, and under an inert protective atmosphere, the temperature is raised to 270°C at a heating rate of 20°C / s, kept for 60s, and then water-cooled to room temperature;

[0039] (4) In the zinc electrodeposition system (Zn 2+ 50g / L, H 2 SO 4 160g / L, ...

Embodiment 2

[0042] In this embodiment, the as-cast lead-based alloy is a Pb-Ag alloy, in terms of mass percentage; Ag=0.5%, and the balance is Pb;

[0043] (1) Cast lead alloy in a resistance furnace according to conventional methods, and the original size of the alloy is 8cm×10cm×12cm;

[0044] (2) Calendering: the Pb alloy obtained in step (1) is rolled by a rolling mill, the rolling temperature is room temperature, and the reduction is 75%, and lubricating liquid is added during the rolling process to lubricate and avoid overheating. After rolling, carry out 24h static aging treatment;

[0045] (3) Surface heat treatment: the anode plate obtained in step (2) is placed in a salt bath with a temperature of 200° C., kept for 135 s, and then cooled to room temperature by water cooling;

[0046] (4) In the zinc electrodeposition system (Zn 2+ 50g / L, H 2 SO 4 160g / L, temperature 40℃), the tensile strength is 20.7MPa, the cell voltage is 1.634V, and the corrosion rate is 3.6g / m 2 h; Com...

Embodiment 3

[0048] In this embodiment, the as-cast lead-based alloy is a Pb-Ag alloy, in terms of mass percentage; Ag=0.8%, and the balance is Pb;

[0049] (1) Cast lead alloy in a resistance furnace according to conventional methods, and the original size of the alloy is 8cm×10cm×12cm;

[0050] (2) Calendering: the Pb alloy obtained in step (1) is rolled by a rolling mill, the rolling temperature is room temperature, and the reduction is 80%, and lubricating liquid is added during the rolling process to lubricate and avoid overheating. Carry out 30h static aging treatment after calendering;

[0051] (3) Surface heat treatment: place the anode plate obtained in step (2) in an intermediate frequency heating coil and heat it until the surface temperature of the anode reaches 220°C, hold the temperature for 6 seconds, and then cool it to room temperature by water cooling;

[0052] (4) In the zinc electrodeposition system (Zn 2+ 50g / L, H 2 SO 4 160g / L, temperature 40℃), the tensile stren...

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Abstract

The invention relates to a method for improving the comprehensive performance of a lead alloy rolling anode. The method is characterized in that the surface of the lead alloy rolling anode is heated to 200-310 DEG C and then is directly water-cooled; and a salt-bath furnace, an oil-bath furnace, high-frequency heating, medium-frequency heating or a protective atmosphere furnace is adopted for surface heating. According to the method, through a rolling-surface thermal treatment manufacture technology, a lead alloy anode with good mechanical performance, electrochemical performance and corrosion-resistance can be obtained. Compared with a rolling anode which is manufactured with a current technology, the rolling anode is advantaged in that the mechanical performance is improved by 12%-25%; the electrochemical performance is improved by 5%-15%; and the corrosion-resistance is improved by 9%-20%. The method is simple in technology and convenient for operation; the good rolling anode mechanical performance of the manufactured rolling anode is maintained, and the electrochemical performance and the corrosion-resistance are further improved; when the method is applied to an electrodeposition procedure of non-ferrous metal metallurgy, a cell voltage during an electrolytic process can be effectively lowered; the service life of the anode is prolonged; pollution to cathode products is reduced; and the method is applicable to industrial application.

Description

technical field [0001] The invention relates to a method for improving the comprehensive performance of a lead alloy rolled anode; in particular, a surface heat treatment method for improving the electrocatalytic activity, mechanical properties and corrosion resistance of a lead alloy rolled anode, which belongs to the field of nonferrous metal hydrometallurgy technology and heat treatment technology . Background technique [0002] In the non-ferrous metal hydrometallurgy process, the electrodeposition process is an important process. In the environment of high sulfuric acid concentration and high current density in the electrodeposition process, the lead alloy anode is widely used in the hydrometallurgical electrodeposition industry because it can form a layer of oxide protective film with good conductivity on the surface. However, lead alloy anodes have a series of disadvantages: 1) Oxygen evolution overpotential is high and useless energy consumption is large. Taking th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C11/00C22F1/12C25C7/02
CPCC22C11/00C22F1/12C25C7/02
Inventor 蒋良兴于枭影赖延清刘芳洋吕晓军杨凡杨建
Owner KUNMING HENDERA SCI & TECH
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