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Grate type titanium-based PbO2 electrode for nonferrous metal electrodeposition and preparation method of grate type titanium-based PbO2 electrode

A non-ferrous metal, electrowinning technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of short life, high electrode cost, uneven deposition layer, etc., to prolong the service life, simple preparation method, improve catalytic active effect

Active Publication Date: 2013-07-17
KUNMING HENDERA SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 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; (4) α-PbO 2 The middle layer has poor conductivity and is prone to large voltage drop; (3) PbO 2 The deposited layer is easy to peel off or corrode, and the service life is not long

Method used

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  • Grate type titanium-based PbO2 electrode for nonferrous metal electrodeposition and preparation method of grate type titanium-based PbO2 electrode
  • Grate type titanium-based PbO2 electrode for nonferrous metal electrodeposition and preparation method of grate type titanium-based PbO2 electrode
  • Grate type titanium-based PbO2 electrode for nonferrous metal electrodeposition and preparation method of grate type titanium-based PbO2 electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, a titanium rod or tube with a diameter of 6mm is quenched and tapped. After mechanical sandblasting and coarsening, it is placed in a 20% NaOH solution and heated to boil for 30 minutes to remove oil, and then placed in a mixed solution for 5 minutes to remove Oxide film is activation treatment, the mixed solution is 10% HNO 3 +20%HC1+5%HF solution, finally rinse with deionized water, blow dry, and place it in a drying box for 12 hours; punch a row of holes at the bottom of the copper conductive row 1 and tap the holes in the The top of the tapped titanium substrate is screwed into the hole and connected to the copper conductive bar, and then filled with lead to form a lead coating layer 3, which is combined into a fence-type titanium-based PbO for non-ferrous metal electrowinning with a size of 976mm×620mm 2 electrode.

[0030] Then proceed as follows: Pb-Ag-TiO is electrodeposited sequentially on the titanium s...

Embodiment 2

[0033] The 3mm diameter titanium rod is quenched and tapped as a whole, after mechanical sandblasting and coarsening, it is placed in a 30% NaOH solution to heat and boil to remove oil for 2 hours, and then put in a concentration of 15% HNO 3 +10%HC1+10%HF solution is pickled for 10min to remove the oxide film and then activated, finally rinsed with deionized water, blown dry, placed in a drying box for 24h until use; lay a row at the bottom of copper conductive row 1 The hole is tapped in the hole, and the top of a set of tapped titanium substrate is screwed into the hole and connected to the copper conductive bar, and then filled with lead to cover it to form a fence type titanium-based PbO for non-ferrous metal electrowinning 2 electrode.

[0034] Then proceed as follows: Pb-Ag-TiO is electrodeposited sequentially on the titanium substrate of the electrode 2 Composite layer, then alkaline electroplated α-PbO 2 Composite layer and acid plating β-PbO 2 The composite layer is obtai...

Embodiment 3

[0037] Choose a titanium rod with a diameter of 3mm~8mm or a titanium tube with a diameter of 6mm~12mm for quenching and tapping. After mechanical sandblasting and coarsening, put it in a 50% NaOH solution to heat and boil to remove oil for 1 hour, and then add 20% HNO. 3 +30%HC1+15%HF solution is pickled for 2min to remove the oxide film and then activated. Finally, it is cleaned with deionized water, blown dry, and placed in a drying box for 2h. Tapping in the hole, screw the top of a group of tapped titanium substrates into the hole and connect with the copper conductive bar, and then pour lead and wrap them to form a fence electrode.

[0038] Then proceed as follows: Pb-Ag-TiO is electrodeposited sequentially on the titanium substrate of the electrode 2 Composite layer, then alkaline electroplated α-PbO 2 Composite layer and acid plating β-PbO 2 The composite layer is obtained to obtain a titanium rod 2 for non-ferrous metal electrowinning. The electrodeposited Pb-Ag-TiO 2 The...

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Abstract

The invention discloses a grate type titanium-based PbO2 electrode for nonferrous metal electrodeposition and a preparation method of the grate type titanium-based PbO2 electrode. The PbO2 electrode comprises an anode consisting of a lead-coated copper conducting bar (1) an a group of titanium rods (2) connected below the lead-coated copper conducting bar, wherein the titanium rods are successively formed by a titanium substrate, a lead silver alloy bottom layer, an alpha-PbO2 composite middle layer and a beta-PbO2 activation surface layer form inside to outside. The preparation method comprises the following steps: carrying out quenching, tapping, sand blasting, deoiling and activating, connecting the titanium substrate with the lead-coated copper conducting bar, electrically depositing a Pb-Ag-TiO2 composite layer on the titanium substrate, plating an alpha-PbO2 composite layer in an alkaline way and plating a beta-PbO2 composite layer in an acidic way to obtain the grate type titanium-based PbO2 electrode for nonferrous metal electrodeposition. The electrode prepared according to the invention has the advantages of good electrocatalytic activity, strong electrode electrical conductivity, low slot voltage in electrodeposition, long service life and low 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, hydrometallurgy and the like, and specifically relates to a titanium rod anode and a preparation method thereof. Background technique [0002] In the entire industrial production, the metallurgical industry is still a big energy consumer, with high production energy consumption, and its main unit energy consumption is on average 40% higher than the advanced foreign level. In the smelting process of non-ferrous metals, more than 80% of zinc is extracted by hydrometallurgical technology. In the hydro-zinc smelting process, the electrowinning process consumes 2 / 3 of the energy consumption of the entire zinc extraction process. The production energy consumption of hydro-zinc smelting is 3800-4200kwh / t.Zn, with an annual output of 5 million tons in 2007. In terms of zinc, the electricity consumption is 20...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C7/02C25D5/38C25D5/10
Inventor 郭忠诚陈步明
Owner KUNMING HENDERA SCI & TECH
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