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Titanium-based composite anode for manganese electrolysis and preparation method of titanium-based composite anode

A composite anode and manganese electrolysis technology, applied in the field of electrochemistry, can solve the problems of anode by-products containing lead, difficult to reuse, and high anode potential, and achieve the effects of large capacity, difficult passivation, and high cycle life

Active Publication Date: 2014-03-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problems of high anode potential and lead-containing by-products in the traditional lead-silver alloy anode, which makes it difficult to reuse, and solves the problem that the traditional titanium-based modified anode is easily passivated in the electrolytic manganese system

Method used

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  • Titanium-based composite anode for manganese electrolysis and preparation method of titanium-based composite anode

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Effect test

Embodiment 1

[0026] -320 mesh pure titanium powder, polyvinyl alcohol, hydrogen peroxide, and deionized water are formulated into a slurry at a mass ratio of 1:0.1:0.2:0.7, coated on a 0.15mm 60 mesh titanium screen, and fired at 60°C. Soak and dry, and then sinter in a vacuum furnace at 1300°C for 2h to obtain a titanium foam matrix reinforced with titanium mesh. The titanium mesh-reinforced foamed titanium substrate was heated to boiling for 2 h with oxalic acid solution with a mass fraction of 15% for mild etching, and the RuCl 3 ·3H 2 O, H 2 IrCl 6 ·6H 2 O is dissolved in hydrochloric acid and ethanol to prepare a coating solution according to the ratio of substances of 3:1, and is coated on the surface of the foamed titanium substrate, dried at 100°C for 15 minutes, then oxidized at 500°C for 10 minutes, after cooling, remove loose matter on the surface, and then The coating was repeated 10 times, and finally the sample was calcined at 500°C for 2 hours to convert chlorides into c...

Embodiment 2

[0029]-320 mesh pure titanium powder and polyvinyl alcohol, hydrogen peroxide, and deionized water are made into a slurry at a mass ratio of 1:0.05:0.3:0.5, and coated on a 40 mesh titanium screen with a wire diameter of 0.25mm. It was foamed and dried at ℃, and then sintered at 1250℃ for 2h in a vacuum furnace to obtain a titanium foam matrix reinforced with titanium mesh. Using oxalic acid solution with a mass fraction of 15%, the titanium mesh-reinforced foamed titanium substrate was heated to boiling for 2 h for mild etching, and H 2 IrCl 6 ·6H 2 O, TaCl 5 Dissolve it in hydrochloric acid and ethanol to prepare a coating solution according to the ratio of the substance at 2:1, apply it on the surface of the foamed titanium substrate, dry it at 100°C for 15 minutes, then oxidize it at 500°C for 10 minutes, remove loose matter on the surface after cooling, and repeat After coating 15 times, the sample was calcined at 500°C for 1 hour to convert chlorides into correspondin...

Embodiment 3

[0032] -320 mesh pure titanium powder and polyvinyl alcohol, hydrogen peroxide, and deionized water are formulated into a slurry at a mass ratio of 1:0.2:0.2:0.6, coated on a 0.29mm 30 mesh titanium screen, and fired at 45°C. Soak and dry, and then sinter in a vacuum furnace at 1300°C for 2h to obtain a titanium foam matrix reinforced with titanium mesh. The titanium mesh-reinforced foamed titanium substrate was heated to boiling for 2 h with oxalic acid solution with a mass fraction of 15% for mild etching, and the RuCl 3 ·3H 2 O was dissolved in hydrochloric acid and ethanol to make a coating solution, coated on the surface of the foamed titanium substrate, dried at 100°C for 15 minutes, then oxidized at 500°C for 10 minutes, removed surface loose matter after cooling, and repeated coating 5 times, and finally the sample Calcined at 500°C for 1-2h to convert chlorides into corresponding oxides. Then with the composite material coated with the noble metal oxide coating as t...

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Abstract

The invention relates to a titanium-based composite anode for manganese electrolysis and a preparation method of the titanium-based composite anode. According to the invention, a titanium wire mesh is used as a framework, and the titanium wire mesh is combined with titanium foam to form titanium wire mesh reinforced foamed titanium to be used as a base body, the surface of the base is coated with one or more precious metallic oxide layers, and then a manganese dioxide layer is coated through pre-electrolysis, so that composite anode is obtained. According to the invention, the preparation process is simple, the prepared titanium-based composite anode solves the difficult problems of a traditional lead silver alloy anode that the anode potential is high and an anode by-product contains lead and is hard to use repeatedly, in addition, the problem that a traditional titanium-based modified anode is easily passivated in a manganese electrolysis system is also solved.

Description

technical field [0001] The invention relates to a titanium-based composite anode for manganese electrolysis and a preparation method thereof, belonging to the field of electrochemistry. Background technique [0002] my country is a big producer and consumer of electrolytic manganese metal. Improving resource utilization and reducing energy consumption are major issues facing the manganese electrolysis industry. [0003] In the traditional electrolytic manganese industry, lead-silver alloy is used as the anode, and the oxygen evolution reaction mainly occurs at the anode, accompanied by the oxidation of part of the manganese, which will generate manganese dioxide. Since the lead in the lead-silver alloy easily enters the anode solid product, the obtained anode manganese dioxide usually contains 10% lead (mass ratio of lead to manganese), and there is no economical and effective method to remove it, which makes it difficult to remove the anode slag from manganese electrolysis....

Claims

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Application Information

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IPC IPC(8): C25C7/02C25C1/10
Inventor 郭华军陈鑫彭文杰李新海王志兴胡启阳
Owner CENT SOUTH UNIV
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