Metal ceramic inert anode for molten salt electrolysis and preparation method thereof

A technology of cermet and molten salt electrolysis, which is applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of poor conductivity, inert anode structure and performance decay, and difficult connection of metal guide rods, etc., to ease thermal expansion mismatch, Solve the effect of selective dissolution and benefit high temperature conductive connection

Inactive Publication Date: 2008-09-03
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Cermets take into account the advantages of strong corrosion resistance of metal oxide ceramics and good electrical conductivity of metals, but there are still problems such as poor thermal shock resistance, poor electrical conductivity, difficulty in connecting with metal guide rods, and difficulty in large-scale; in addition, the electrolysis process In the process, the oxidation and selective dissolution of the outer metal phase of the cermet will not only reduce the purity of the primary aluminum, but also cause the structure and performance of the inert anode to decay, thus causing the material to fail during service.

Method used

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  • Metal ceramic inert anode for molten salt electrolysis and preparation method thereof
  • Metal ceramic inert anode for molten salt electrolysis and preparation method thereof
  • Metal ceramic inert anode for molten salt electrolysis and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Example 1: CaO-Cu-NiO-NiFe 2 O 4 Cermet inert anode

[0046] CaO-Cu-NiO-NiFe 2 O 4 The raw material formula of the cermet inert anode is shown in Table 1. First, weigh NiO and Fe respectively according to 1.35:1 (molar ratio) 2 O 3 Powder, where NiO powder has a particle size of 10μm, Fe 2 O 3 The particle size of the powder is 10μm, and it is dispersed with at least one of industrial alcohol or water, phthalic acid, oleic acid, ammonia salt solution, polyacrylamide solution, fish oil, butyl phthalate, polyacrylate, and polyacrylamide. It was treated by ball milling for 8 hours, dried at 80°C for 24 hours, and then put into a corundum crucible, placed in a resistance furnace in an air atmosphere, and calcined at 1200°C for 6 hours to obtain composite ceramic powder with an average particle size of about 10μm. X-ray diffraction phase analysis shows that the ceramic powder mainly contains NiO and NiFe 2 O 4 Two-phase. Then take the pre-prepared NiO-NiFe 2 O 4 The powder is a ...

Embodiment 2

[0049] Example 2: CaO-Ni-NiFe 2 O 4 Cermet inert anode

[0050] CaO-Ni-NiFe 2 O 4 The raw material formula of the cermet inert anode is shown in Table 2. First weigh NiO and Fe at 1:1 (molar ratio) 2 O 3 Powder, where NiO powder has a particle size of 20μm, Fe 2 O 3 The particle size of the powder is 20μm, and it is dispersed by at least one of water or industrial alcohol, phthalic acid, oleic acid, ammonia salt solution, polyacrylamide solution, fish oil, butyl phthalate, polyacrylate, and polyacrylamide It was treated by ball milling for 8 hours, dried at 80°C for 24 hours, then placed in a corundum crucible, placed in a resistance furnace in an air atmosphere, and calcined at 1200°C for 6 hours to obtain composite ceramic powder with an average particle size of about 18μm. X-ray diffraction phase analysis shows that the ceramic powder mainly contains NiFe 2 O 4 phase. Then take the pre-prepared NiFe 2 O 4 The powder is a ceramic phase base material, and 2% (mass percentage, the...

Embodiment 3

[0053] Example 3: CaO-BaO-Ni-NiO-NiFe 2 O 4 Cermet inert anode

[0054] CaO-BaO-Ni-NiO-NiFe 2 O 4 The raw material formula of the cermet inert anode is shown in Table 3. First, weigh NiO and Fe respectively according to 1.35:1 (molar ratio) 2 O 3 Powder, where NiO powder has a particle size of 50μm, Fe 2 O 3 The powder particle size is 50μm, and it is dispersed with at least one of phthalic acid or industrial alcohol, water, oleic acid, ammonia salt solution, polyacrylamide solution, fish oil, butyl phthalate, polyacrylate, and polyacrylamide It was treated by ball milling for 8 hours, dried at 80°C for 24 hours, and then placed in a corundum crucible, placed in a resistance furnace in an air atmosphere, and calcined at 1200°C for 6 hours to obtain composite ceramic powder with an average particle size of about 32μm. X-ray diffraction phase analysis shows that the ceramic powder mainly contains NiFe 2 O 4 phase. Then take the pre-prepared NiFe 2 O 4 The powder is a ceramic phase b...

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Abstract

The invention relates to a raw material component of cermet inert anode having metallographic phase distributed in gradient from internal side to external side and preparation technology. The material is applied to extracting non-ferrous metal (Al, rare earths and metals with high-melting point) by fused salt electrolytic route. The component comprises the cermet formed by at least one Ca-Fe-Ni-O composite spinel oxide and at least one metallographic phase; wherein the anode material is composed of raw material with following mass prescription: 1% to 5% single metal or alloy, 1% to 99% spinel oxide, 0.1% to 10% other metal oxides; oxidizing the materials selectively in process of sintering the materials by adjusting oxygen content in whole atmosphere to form high strength, high tenacity, high conductivity inner layer (high content of metal) having anticorrosion outer layer (high content of oxides) functional gradient structure. The method of the invention is capable of effectively solving problems that the cermet inert anode is connected with the metal guide and the metallographic phase is dissolved and oxidized selectively in electrolytic process.

Description

Technical field [0001] The invention relates to a molten salt electrolysis extraction electrode for non-ferrous metals (Al, rare earth, high melting point metals, etc.), in particular to a cermet inert anode material for molten salt electrolysis and a preparation method thereof. technical background [0002] The current molten salt electrolysis process using carbon anodes has high energy consumption, large carbon consumption, and serious environmental pollution (emissions a large amount of greenhouse gas CO 2 And fluorocarbon CF n Etc.), large investment, high cost, low efficiency, unstable production and other issues. Inert anodes are non-consumable anodes. The new electrolysis process that uses inert anodes does not require carbon anodes or carbon anode factories; do not periodically replace anodes during production, so production is stable; anodes discharge oxygen. No CO emissions 2 With fluorocarbons, the environment is greatly improved; the current electrolytic cell structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C7/02C25C3/00C25C3/12
Inventor 李劼赖延清张刚田忠良李志友周科朝张凯刘凯刘业翔
Owner CENT SOUTH UNIV
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