Fabrication method of fence-type titanium-based pbo2 anode for electrowinning of non-ferrous metals

Abstract

A method for making a fence-type titanium-based PbO2 anode for electrowinning of nonferrous metals, the anode includes a titanium-clad copper conductive row (1) and a group of vertical titanium rods (2) connected to the bottom of the titanium-clad copper conductive row, each titanium The rod is sequentially composed of titanium substrate, pretreatment layer, α-PbO 2 Composite interlayer and β‑PbO 2 Composite activated surface layer. The production method is to first connect the titanium base to the bottom of the titanium-clad copper conductive row to form a fence structure, and then degrease, sandblast, remove the oxide film, activate the titanium base of the fence structure, and then undergo alkaline electroplating α -PbO 2 Composite layer and acid plating of β‑PbO 2 Composite layer to obtain fence-type titanium-based PbO for non-ferrous metal electrowinning 2 Anode plate. The novel anode prepared by the method of the present invention has excellent mechanical and anti-corrosion properties, and can greatly reduce the voltage of the electrolytic cell in the electrometallurgical processes such as wet electrodeposited zinc, electrodeposited copper, electrodeposited nickel, and electrodeposited manganese. energy consumption.

Description

technical field [0001] The invention relates to the technical field of anodes for metal electrowinning used in the fields of composite electrodeposition, non-ferrous metal smelting and hydrometallurgy, and in particular to fence-type titanium-based PbO 2 How to make the anode. Background technique [0002] In the whole industrial production, the metallurgical industry is still a big energy consumer, with high production energy consumption, and its main unit energy consumption is 40% higher than the foreign advanced level on average. In the smelting process of non-ferrous metals, more than 80% of zinc is extracted by hydrometallurgical technology. In the hydrometallurgy process, the electrowinning process consumes 2 / 3 of the energy consumption of the entire zinc extraction process, and the production energy consumption of hydrometallurgy zinc is 3800-4200kwh / t.Zn. In 2007, the national annual output was 5 million tons According to zinc meter, the power consumption is 20.3 b...

AI Technical Summary

Problems solved by technology

However, in these electrodes, metal platinum and its alloys are expensive and consume significantly when used at high current densities.

It is difficult to manufacture lead oxide electrodes, and the plating layer is prone to pitting corrosion, which makes the corrosion resistance poor

The titanium-based surface is coated with noble metal or its oxide. This kind of anode has the following disadvantages: (1) the cost of the electrode is high, and (2) the service life is short. To improve people generally use coating intermediate coating to prevent, but can not solve the problem fundamentally, (3) in electrowinning solution, impurity ion (Mn 2+ ) deposition on the anode in the oxide state after oxidation reduces the effect of coating precious metals

But the PbO produced by electroplating in this way 2 As an insoluble anode, the electrode will have the following problems in use: (1) PbO 2 The deposition layer is not tightly combined with the electrode surface or the deposition layer is uneven; (2) PbO 2 The deposited layer is porous and rough, with large internal stress; (3) α-PbO 2 The middle layer has poor conductivity and is prone to large voltage drop; (4) PbO 2 The deposited layer is easy to peel off or corrode, and the service life is not long

And doped with fluorine-containing resin and (or) inactive particulate PbO 2 The cell voltage of the electrode used in the electrowinning of non-ferrous metals is high; (4) the current efficiency is low, although PbO 2 The electrocatalytic activity of the electrode is high, but the current efficiency in non-ferrous metal electrowinning applications is not very high

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