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A titanium-based composite anode for manganese electrolysis, preparation method and application thereof

A composite anode and electrolytic manganese technology, applied in the field of electrochemistry, can solve the problems of complex preparation of nano-titanium dioxide layers and difficult industrial application, and achieve the effects of no cleaning process, long service life, and tight adhesion.

Active Publication Date: 2020-09-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method of pre-introducing a thin and dense intermediate layer on the electrode surface can greatly increase the service life of titanium anodes, the preparation of nano-titanium dioxide layers is complicated and difficult for industrial application.

Method used

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  • A titanium-based composite anode for manganese electrolysis, preparation method and application thereof
  • A titanium-based composite anode for manganese electrolysis, preparation method and application thereof
  • A titanium-based composite anode for manganese electrolysis, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Such as figure 1 As shown, the titanium-based composite anode in this embodiment includes a titanium substrate, an active oxygen barrier layer and a manganese dioxide deposition layer. Among them, the titanium substrate is pure titanium sheet, and the active oxygen barrier layer is Ca 2 mn 2 o 5 layer, and the manganese dioxide deposition layer is in-situ electrodeposited on the surface of the active oxygen barrier layer.

[0044] The preparation method of the titanium-based composite anode of this embodiment comprises the following steps:

[0045](1) Titanium sheet pretreatment: Polish the titanium sheet with 360#, 600#, 800#, and 1000# sandpaper in sequence, then ultrasonically clean it with acetone, ethanol, and deionized water for 10 minutes, and then polish the titanium sheet to a smooth surface. Piece into HF:HNO 3 = Activate in a mixed acid solution of 1:2 for 30s, wash and dry;

[0046] (2) Preparation of active oxygen barrier layer: Calcium acetate and ma...

Embodiment 2

[0059] The structure of the titanium-based composite anode in this example is the same as in Example 1, but the active oxygen barrier layer is CoMn 2 o 4 layer.

[0060] The preparation method of the titanium-based composite anode of this embodiment comprises the following steps:

[0061] (1) Titanium sheet pretreatment: Polish the titanium sheet with 360#, 600#, 800#, and 1000# sandpaper in sequence, then ultrasonically clean it with acetone, ethanol, and deionized water for 10 minutes, and then polish the titanium sheet to a smooth surface. Piece into HF:HNO 3 =1:2 mixed acid solution for activation for 60s, cleaning and drying;

[0062] (2) Preparation of active oxygen barrier layer: Dissolve manganese acetate and cobalt acetate in a mixture of ethylene glycol and citric acid solution at an atomic ratio of 2:1, and then coat the resulting solution on the surface of the above-mentioned electrode. Place it under the muffle furnace and roast for 15 minutes, this process is...

Embodiment 3

[0074] The structure of the titanium-based composite anode in this example is the same as in Example 1, but the active oxygen barrier layer is NiCo 2 o 4 layer.

[0075] The preparation method of the titanium-based composite anode of this embodiment comprises the following steps:

[0076] (1) Titanium sheet pretreatment: Polish the titanium sheet with 360#, 600#, 800#, and 1000# sandpaper in sequence, then ultrasonically clean it with acetone, ethanol, and deionized water for 20 minutes, and then polish the titanium sheet to a smooth surface. Piece into HF:HNO 3 = Activate in a mixed acid solution of 1:2 for 30s, wash and dry;

[0077] (2) Preparation of active oxygen barrier layer: Dissolve nickel acetate and cobalt acetate in a mixture of ethylene glycol and citric acid solution at an atomic ratio of 1:2, and then coat the resulting solution on the surface of the above electrode, and heat it at 500°C Place it under the muffle furnace and roast for 15 minutes, this proces...

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Abstract

The invention discloses a titanium-based composite anode for manganese electrolysis. The titanium-based composite anode comprises a titanium base body, an active oxygen barrier layer and a manganese dioxide deposition layer, wherein the active oxygen barrier layer is located on the surface of the titanium base body, and the manganese dioxide deposition layer is deposited on the surface of the active oxygen barrier layer in situ. The invention further provides a preparation method of the titanium-based composite anode. The preparation method comprises the following steps that (1) the titanium base body with the smooth surface which is ground is cleaned and then is put into an acid solution for etching treatment to obtain a pretreated titanium base body; (2) mixed salt used for forming the active oxygen barrier layer is coated on the surface of the pretreated titanium base body, and then roasting treatment is carried out to obtain the titanium base body containing the active oxygen barrier layer; and (3) the titanium base body containing the active oxygen barrier layer is taken as an anode, and the manganese dioxide deposition layer is formed on the surface of the titanium base bodythrough electrodeposition to obtain the titanium-based composite anode. The invention further provides an application of the titanium-based composite anode in the manganese electrolysis. The titanium-based composite anode has the advantages that the service life is long, and products are not polluted.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a titanium-based composite anode and its preparation method and application. Background technique [0002] In the electrolytic manganese metal, the traditional anode is lead anode, because in the process of electrolysis, a loose oxide film will be formed on the surface of the anode, which will increase the area of ​​the anode and reduce the real current density, so that the anode will generate a large amount of secondary Manganese oxide causes waste of resources and energy. In addition, due to the porosity of the surface film of the lead anode, the attached manganese dioxide is easy to fall into the anolyte under the scouring of the anode oxygen, which makes the anolyte deteriorate. Therefore, in the electrolytic manganese metal plant, production must be stopped every half a month to clean up the electrolytic tank, resulting in a decrease in production efficiency. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C7/02C25C1/10C23C28/04
CPCC23C28/04C25C1/10C25C7/02
Inventor 郭华军罗树亮李新海王志兴彭文杰胡启阳王接喜颜果春张书恺
Owner CENT SOUTH UNIV
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