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

A cermet, inert anode technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of poor conductivity, inert anode structure and performance decay, difficult connection of metal guide rods, etc., to alleviate thermal expansion mismatch, solve Selective dissolution and the effect of facilitating high-temperature conductive connections

Inactive Publication Date: 2010-08-11
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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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 particle size is 10μm, Fe 2 o 3 The particle size of the powder is 10 μm, 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 agent, ball milled for 8h, dried at 80°C for 24h, then put into a corundum crucible, placed in an electric resistance furnace in an air atmosphere, and calcined at 1200°C for 6h to obtain a 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 phases. Then with pre-prepared NiO-NiFe 2 o 4 The powder is a ceramic phas...

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 respectively according to 1:1 (molar ratio). 2 o 3 powder, where NiO powder particle size is 20μm, Fe 2 o 3 The particle size of the powder is 20 μm, and it is dispersed with at least one of water or industrial alcohol, phthalic acid, oleic acid, ammonium salt solution, polyacrylamide solution, fish oil, butyl phthalate, polyacrylate, and polyacrylamide agent, ball milled for 8 hours, dried at 80°C for 24 hours, 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 a composite ceramic powder with an average particle size of about 18 μm. X-ray diffraction phase analysis shows that the ceramic powder mainly contains NiFe 2 o 4 Mutually. Then with pre-prepared NiFe 2 o 4 The powder is a ceramic phase base material,...

Embodiment 3

[0053] Embodiment 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 particle size is 50μm, Fe 2 o 3 The particle size of the powder is 50 μm, 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 agent, ball milled for 8 hours, dried at 80°C for 24 hours, 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 a composite ceramic powder with an average particle size of about 32 μm. X-ray diffraction phase analysis shows that the ceramic powder mainly contains NiFe 2 o 4 Mutually. Then with pre-prepared NiFe 2 o 4 The powder is a ceramic p...

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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-Ocomposite 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% spineloxide, 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 an electrode for extraction of non-ferrous metals (Al, rare earth and high-melting point metals, etc.) by molten salt electrolysis, 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, high carbon consumption, and serious environmental pollution (emission of a large amount of greenhouse gas CO 2 and fluorocarbon CF n etc.), large investment, high cost, low efficiency, unstable production and other issues. The inert anode is a non-consumable anode. The new electrolysis process using an inert anode does not require carbon anodes at all, nor does it require a carbon anode factory; the anode is not periodically replaced during production, so the production is stable; the anode discharges oxygen. Does not emit CO 2 And fluorocarbons, the environment is...

Claims

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Application Information

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Patent Type & Authority Patents(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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