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Inert ceramet anode for electrolyzing molten salt and its prepn

A cermet, inert anode technology, applied in electrodes, electrolysis components, electrolysis process, etc., can solve the problems of metal phase overflow and uneven distribution, poor thermal shock resistance, poor electrical conductivity, etc. The effect of convenient performance and good sintering performance

Inactive Publication Date: 2004-11-24
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, cermets take into account the advantages of strong corrosion resistance of metal oxide ceramics and good electrical conductivity of metals, but have poor thermal shock resistance and poor electrical conductivity (the commonly used ceramic phase matrix NiFe 2 o 4 Poor electrical conductivity), difficulty in connecting with metal guide rods, difficulty in large-scale and other issues; in addition, in the process of material preparation, due to the poor wettability of the metal phase (such as Cu) to the ceramic matrix, the ceramic matrix The stability of the metal phase is poor, and the overflow and uneven distribution of the metal phase are prone to occur, and it is difficult to realize the densification of the material; the oxidation of the metal phase and the dissociation or reduction of the ceramic phase are prone to occur during the sintering process of the material; Oxidation and selective dissolution of the phase, and at the same time bring the slag off of the ceramic phase

Method used

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  • Inert ceramet anode for electrolyzing molten salt and its prepn
  • Inert ceramet anode for electrolyzing molten salt and its prepn
  • Inert ceramet anode for electrolyzing molten salt and its prepn

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] SnO 2 -NiFe 2 o 4 / Ni-Cu-Co cermet inert anode.

[0028] ① Prepare ceramic powder, press figure 1 The technical process is carried out, the raw materials in Table 1 are added to industrial alcohol as a dispersant, ball milled for 8 hours, and calcined at 1200 ° C for 8 hours to obtain ceramic powder with an average particle size of 3.31 μm. X-ray diffraction phase analysis shows that the ceramic powder contains SnO 2 and NiFe 2 o 4 Two phases; the obtained ceramic matrix has good corrosion resistance, has semiconductor properties at the temperature of aluminum electrolysis, and is used as the powder raw material of the ceramic matrix of the cermet inert anode.

[0029] raw material

Mass percentage (%)

SnO 2

50.00

f 2 o 3

36.58

NiO

13.42

[0030] ②Prepare the cermet inert anode, proceed according to the process flow in Figure 2, use industrial alcohol as the dispersant and polyvinyl alcohol as ...

Embodiment 2

[0033] SnO 2 -NiFe 2 o 4 -Sb 2 o 3 / Ni-Cu-Cr cermet inert anode

[0034] ① Prepare ceramic powder, press figure 1The process flow is carried out. The raw materials in Table 3 are treated with industrial alcohol as a dispersant, ball milled for 8 hours, and calcined at 1200°C for 8 hours to obtain ceramic powder with an average particle size of 3.11 μm. X-ray diffraction phase analysis shows that the ceramic powder mainly contains SnO 2 and NiFe 2 o 4 two phases. The obtained ceramic substrate has good corrosion resistance, has semiconducting properties at the aluminum electrolysis temperature, and has good electrical conductivity, and can be used as a ceramic powder raw material for a cermet inert anode.

[0035] raw material

Mass percentage (%)

SnO 2

48.00

f 2 o 3

36.58

NiO

13.42

Sb 2 o 3

2.00

[0036] ②Prepare the cermet inert anode, proceed according to the process flow in Fi...

Embodiment 3

[0039] SnO 2 -NiAl 2 o 4 -CuO / Ni-Cu-Ag cermet inert anode

[0040] ① Prepare ceramic powder, press figure 1 The process flow is carried out. The raw materials in Table 5 are treated with industrial alcohol as a dispersant, ball milled for 8 hours, and calcined at 1300° C. for 8 hours to obtain a ceramic powder with a thickness of 4.11 μm. X-ray diffraction phase analysis shows that the ceramic powder mainly contains SnO 2 and NiAl 2 o 4 two phases. The obtained ceramic matrix has good corrosion resistance, has semiconducting properties at the aluminum electrolysis temperature, and can be used as a ceramic powder raw material for the cermet inert anode.

[0041] raw material

Mass percentage (%)

SnO 2

50.00

Al 2 o 3

27.71

NiO

20.29

CuO

2.00

[0042] ②Prepare the cermet inert anode, proceed according to the process flow in Figure 2, use denatured alcohol as the dispersant and polyvinyl a...

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Abstract

The present invention relates to electrode for molten salt electrolyzing process of non-ferrous metal, and is especially inert ceramet anode and its preparation process. The present invention features that ceramic powder is first prepared with SnO2 in 0.01-100 wt%, composite oxide in spinelle structure AB2O4 in 0-99 wt% and MxOy in 0-30 wt%; and ceramic phase in 50-99 wt% and metal phase, which Ni-Cu-X alloy powder or metal powder, in 1-50 wt% are then prepared into the inert ceramet anode. The present invention has raised conducting performance and anticorrosive performance of ceramic phase, improved wetting performance of the metal phase on the ceramic phase, homogeneous distribution and no overflow of the metal phase during sintering, compact material structure, no oxidation of metal phase, no disintegration and reduction of ceramic phase and inert ceramet anode material with excellent performance.

Description

Technical field: [0001] The invention relates to an electrode for the molten salt electrolysis extraction of nonferrous metals (Al, rare earth and high melting point metals, etc.), in particular to a cermet inert anode and a preparation method thereof. Background technique: [0002] The high-temperature molten salt electrolysis process puts forward strict requirements for inert anode materials, mainly including: able to withstand the corrosion of the electrolyte, low solubility; able to withstand the erosion of high-temperature new ecological oxygen; good electrical conductivity; high mechanical strength, Strong thermal shock resistance, not easy to be brittle; easy to process and shape, easy to connect with metal guide rods, etc. The inert anode materials reported in the patent literature mainly include metal oxide ceramics, alloy anodes and cermets. Among them, cermets take into account the advantages of strong corrosion resistance of metal oxide ceramics and good electri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12C25C7/02
Inventor 赖延清李劫丁风其田忠良张刚秦庆伟张吉龙孟杰刘业翔
Owner CENT SOUTH UNIV
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