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Preparation method of long-life iridium-zirconium composite oxide inert anode

A composite oxide, inert anode technology, applied in electrodes, liquid chemical plating, coatings, etc., can solve the problems of limited large-scale application, short anode life, high anode production cost, easy operation and equipment investment. Low, less equipment effect

Active Publication Date: 2019-07-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of use, it was found that Ti / RuO 2 Although the anode shows excellent oxygen evolution catalytic performance, which reduces the oxygen evolution overpotential of the anode during the electrolysis process, but in the sulfuric acid system, Ti / RuO 2 The service life of the anode is short, about 100 days, which restricts its application in the hydrometallurgical process
Ti / IrO 2 Although the oxygen evolution catalytic performance of the anode is slightly worse than that of Ti / RuO 2 Anode, but it shows good corrosion resistance in sulfuric acid system, its service life can reach more than 1 year, but iridium is expensive, Ti / IrO 2 The high production cost of the anode limits its large-scale application

Method used

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  • Preparation method of long-life iridium-zirconium composite oxide inert anode
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  • Preparation method of long-life iridium-zirconium composite oxide inert anode

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0039] First, a titanium plate of 10mm×10mm×1mm was washed with alkali at 60°C for 30 minutes, etched with 10% oxalic acid at 90°C for 2.5 hours, ultrasonically cleaned with deionized water for 10 minutes, and then dried for use.

[0040] Weigh a certain mass of Ce(NO 3 ) 3 、H 2 IrCl 6 Miscible with tetrabutyl zirconate.

[0041] The miscible Ce(NO 3 ) 3 、H 2 IrCl 6 The mixed solution of tetrabutyl zirconate and tetrabutyl zirconate is dissolved in a mixed solvent of n-butanol and isopropanol mixed in a ratio of 1:1 to obtain a coating solution. Ce(NO 3 ) 3 、H 2 IrCl 6 The molar concentrations of tetrabutyl zirconate and tetrabutyl zirconate were 0.098, 0.042 and 0.060 mol / L, respectively.

[0042] The prepared coating solution was evenly coated on the surface of the pretreated titanium substrate with a brush, dried at 120°C for 10 minutes, then sintered at 500°C for 10 minutes, and cooled to room temperature after taking it out. After the above steps were repeate...

Embodiment approach 2

[0045] First, a titanium plate of 10mm×10mm×1mm was washed with alkali at 60°C for 30 minutes, etched with 10% oxalic acid at 90°C for 2.5 hours, ultrasonically cleaned with deionized water for 10 minutes, and then dried for later use.

[0046] Weigh a certain mass of Ce(NO 3 ) 3 、H 2 IrCl 6 Miscible with tetrabutyl zirconate.

[0047] Ce(NO 3 ) 3 、H 2 IrCl 6 The mixed solution with tetrabutyl zirconate is dissolved in a mixed solvent of n-butanol and isopropanol mixed in a ratio of 1:1 to obtain a coating solution. Ce(NO 3 ) 3 、H 2 IrCl 6 The molar concentrations of tetrabutyl zirconate and tetrabutyl zirconate were 0.050, 0.050 and 0.100 mol / L, respectively. .

[0048] The prepared coating solution was evenly coated on the surface of the pretreated titanium substrate with a brush, dried at 120°C for 15 minutes, then sintered at 450°C for 15 minutes, and cooled to room temperature after taking it out. After the above steps were repeated 25 times, the anode plate...

Embodiment approach 3

[0051] First, a titanium plate of 10mm×10mm×1mm was washed with alkali at 60°C for 30 minutes, etched with 10% oxalic acid at 90°C for 2.5 hours, ultrasonically cleaned with deionized water for 10 minutes, and then dried for later use.

[0052] Weigh a certain mass of Ce(NO 3 ) 3 、H 2 IrCl 6 Miscible with tetrabutyl zirconate.

[0053] Ce(NO 3 ) 3 、H 2 IrCl 6 The mixed solution with tetrabutyl zirconate is dissolved in a mixed solvent of n-butanol and isopropanol mixed in a ratio of 1:1 to obtain a coating solution. Ce(NO 3 ) 3 、H 2 IrCl 6 The molar concentrations of zirconate and tetrabutyl zirconate were 0.042, 0.098 and 0.060mol / L, respectively.

[0054] The prepared coating solution was evenly coated on the surface of the pretreated titanium substrate with a brush, dried at 120°C for 15 minutes, then sintered at 400°C for 15 minutes, and cooled to room temperature after taking it out. After the above steps were repeated 25 times, the anode plate was sintered a...

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Abstract

The invention relates to a preparation method of a long-life iridium-zirconium composite oxide inert anode. The preparation method involves an iridium-cerium-zirconium or iridium-tin-zirconium ternarycomposite oxide inert anode, and an iridium-cerium-rubidium-zirconium or iridium-tin-rubidium-zirconium quaternary composite oxide inert anode. The prepared anode consists of a titanium matrix and anoxide coating; and in the coating, zirconium dioxide and rubidium oxide are amorphous phases, iridium dioxide and tin dioxide are rutile phases, cerium dioxide is a fluorite phase, the conductivity of the anode is enhanced through addition of rubidium, precipitation of oxygen evolution active substances IrO2 crystals is promoted by adding zirconium, cerium doping plays a role in refining crystalgrains, the zirconium or the cerium is added to increase the active surface area of the anode, and doping of the zirconium, the cerium or the tin improves the corrosion resistance of the anode in a sulfuric acid system and thus prolongs the service life of the anode. The preparation process of the method is simple, the prepared anode has better oxygen evolution catalytic activity and a long service life, and in addition, as the noble metal iridium in the coating is replaced by non-noble metal, the production cost of the anode is reduced.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a preparation method of a long-life iridium-zirconium composite oxide inert anode, including an iridium-cerium-zirconium ternary composite oxide inert anode, an iridium-tin-zirconium ternary composite oxide inert anode, Iridium cerium rubidium zirconium quaternary composite oxide inert anode and iridium tin rubidium zirconium quaternary composite oxide inert anode. Background technique [0002] In the past ten years, my country's non-ferrous industry has developed rapidly, especially the output of copper, zinc and other metals has grown rapidly. Compared with pyrometallurgy, hydrometallurgy has the advantages of large production capacity, high efficiency, good operating conditions, light pollution and high comprehensive recovery rate of valuable metals. At present, about 80% of the world's zinc and about 20% of Copper is extracted by hydrometallurgy. As the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C7/02C23C18/12
CPCC23C18/1216C23C18/1241C25C7/02
Inventor 王成彦刘宝陈永强王硕
Owner UNIV OF SCI & TECH BEIJING
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