A kind of preparation method of zinc electrowinning anode

A zinc electrowinning and anode technology, applied in electrodes, electrolytic components, electrolytic processes, etc., can solve the problems of high oxygen evolution overpotential, low mechanical strength, and short service life, and achieve low oxygen evolution overpotential and high mechanical strength , long service life effect

Active Publication Date: 2021-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the zinc electrowinning process, the cast Pb-Ag (0.3~1%) anode is widely used in the zinc electrowinning industry due to the advantages of easy availability of raw materials and good stability, but the cast Pb-Ag (0.3~1%) anode At the same time, there are also the following problems: 1) The useless power consumption due to the high oxygen evolution overpotential accounts for about 20-30% of the total power consumption of zinc electrowinning; 2) Lead is easily dissolved and enters the cathode product, affecting the precipitation of zinc Quality; 3) The service life is only 0.5~1 year
[0004] 1. Pb-based alloy anodes, such as Pb-Sn, Pb-Ti and other binary alloys, Pb-Ag-Ca, Pb-Ag-Sr and other ternary alloys, Pb-Ag-Ca-Sn, Pb-Ag-Ca- Quaternary alloys such as Sr, such anodes can reduce the use of Ag to a certain extent, but there are still problems such as high oxygen evolution overpotential, short service life, and easy dissolution of lead into cathode zinc.
[0005] 2. Coating (plating) layer anode, such as Ti-based coating anode (Ti / IrO 2 -Ta 2 o 5 ), Al-based coating anode (Al / α-PbO 2 ), Pb-based coated anode (Pb / MnO 2 ), graphite-based coating anode (graphite / β-PbO 2 ), this type of anode has the disadvantages of complex manufacturing process and high manufacturing cost, which limits the industrial application of this type of anode
[0006] 3. Proton-doped polyaniline anode, this type of anode can effectively reduce the oxygen evolution overpotential, but this type of anode has problems such as low mechanical strength and short service life, which limit its wide application in industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take lead powder with an average particle size of 40 μm, silver powder with an average particle size of 8 μm, and lead dioxide powder with an average particle size of 20 μm, and mix them according to the mass ratio of lead powder: silver powder: lead dioxide powder: 94.5:0.5:4. The powder after batching was rolled and mixed with a roller ball mill for 3 hours. Put the mixed powder into the mold and press it with a press for 50s under the pressure of 2MPa. The pressed material was put into a sintering furnace and hydrogen gas was introduced, and the sintering temperature was 320°C for isothermal sintering for 6 hours. After the sintering was completed, the material was taken out of the sintering furnace and cooled to room temperature naturally.

[0026] The anode prepared above, in 160g / L of H 2 SO 4 , 50g / L of Zn 2+ In solution, at a temperature of 35°C and a current density of 500A / m 2 The electrodeposition results show that the oxygen evolution overpotential of th...

Embodiment 2

[0029] Take lead powder with an average particle size of 30 μm, silver powder with an average particle size of 3 μm, lead dioxide powder with an average particle size of 12 μm, and cerium dioxide powder with an average particle size of 10 μm, according to lead powder: silver powder: lead dioxide powder: cerium dioxide The powder quality configuration is 94.5:0.5:3:1 for batching. The powder after batching was rolled and mixed with a roller ball mill for 5 hours. Put the mixed powder into the mold, and press it with a press for 100s under the pressure of 2MPa. The pressed material was put into a sintering furnace and hydrogen gas was introduced, and the sintering temperature was 325°C for isothermal sintering for 6 hours. After the sintering was completed, the material was taken out of the sintering furnace and cooled to room temperature naturally.

[0030] The anode prepared above, in 160g / L of H 2 SO 4 , 50g / L of Zn 2+ In solution, at a temperature of 35°C and a current d...

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Abstract

The invention discloses a method for preparing a zinc electrodeposited anode, which comprises: batching and mixing powder: batching lead powder, silver powder, and lead dioxide powder, rolling and mixing the batched powder until uniform; in mass percentage, The silver powder is 0.1-1%, the lead dioxide powder is 0.1-10%, and the rest is lead powder; pressing and sintering: pressing the uniformly mixed powder and sintering in a reducing and protective atmosphere; cooling: cooling the sintered material naturally. The invention has low equipment requirements and is easy to prepare the anode. The anode prepared by the invention has the advantages of low oxygen evolution overpotential, high mechanical strength, good corrosion resistance, long service life, etc., and can replace the traditional casting Pb-Ag anode.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal hydrometallurgy, and in particular relates to a preparation method of a zinc electrodeposition anode. Background technique [0002] Zinc is a non-ferrous metal that is widely used in machinery manufacturing, automobiles, aviation, ships, batteries and other fields, and plays a vital role in the national economy. Metal zinc is dominated by hydrosmelting, accounting for about 85% of the total zinc output, and about 80% of the electricity consumption in hydrosmelting is used for electrowinning. In the zinc electrowinning process, the cast Pb-Ag (0.3~1%) anode is widely used in the zinc electrowinning industry due to the advantages of easy availability of raw materials and good stability, but the cast Pb-Ag (0.3~1%) anode At the same time, there are also the following problems: 1) The useless power consumption due to the high oxygen evolution overpotential accounts for about 20-30% of the to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C11/00C22C32/00C22C1/05C25C7/02C25C1/16
CPCY02P10/20
Inventor 袁铁锤李海华王文军
Owner CENT SOUTH UNIV
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