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Alloy material applicable to inert anode of metal molten salt electrolytic cell

A technology of alloy materials and inert anodes, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems that cannot meet the needs of industrial applications, and achieve the effects of improving electrolysis efficiency, improving corrosion resistance, and reducing pollution

Inactive Publication Date: 2013-03-27
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Although extensive and in-depth research and exploration have been carried out on inert anode materials aimed at replacing carbon anodes, none of them can meet the requirements of industrial applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] An alloy material suitable for the inert anode of the metal molten salt electrolytic cell. The mass composition of the alloy is: 47% copper, 30% nickel, 15% iron, and 8% aluminum. The alloy is melted in the temperature range of 1300-1500°C in an intermediate frequency induction furnace, and then cast by water cooling. After heat treatment, the cast ingot is cut into small discs with a diameter of 25mm and a thickness of 30mm, and the density of the small discs is more than 98% of the theoretical density. The high temperature oxidation resistance test was carried out at 850°C, and the oxidation time was 200-300 hours. The results showed that the oxidation weight gain rate of the alloy was less than 0.01 mg / cm 2 h.

Embodiment 2

[0034] An alloy material suitable for the inert anode of the metal molten salt electrolytic cell, the alloy mass composition is: 75.7% copper, 15% nickel, 5% iron, 4% aluminum, 0.3% lanthanum. The alloy is melted in the temperature range of 1200-1400°C in a vacuum induction furnace, and then cast by water cooling. Electrolytic tests show that the alloy has greatly improved oxide film adhesion and robustness and anti-interference to temperature fluctuations.

Embodiment 3

[0036] An alloy material suitable for the inert anode of the metal molten salt electrolytic cell, the alloy mass composition is: 67% copper, 15% nickel, 10% iron, 6% aluminum, 2% zinc. The alloy is melted in the temperature range of 1200-1400°C in an intermediate frequency induction furnace, then cast in water cooling, and then slightly processed to form an anode product. In KF-NaF-AlF 3 -Al 2 o 3 In the electrolysis test of the system 200A, the electrolysis temperature is 750°C, and the anode current density is 0.5A / cm 2 , Electrolyzed for 300 hours, can get primary aluminum with a quality of more than 99.7%. The alloy anode forms a mixed ceramic protective layer mainly composed of copper aluminate on the surface through in-situ electrochemical polarization.

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Abstract

The invention relates to an alloy material applicable to an inert anode of a metal molten salt electrolytic cell, relates to metal molten salt electrolysis, and provides a carbon-free metal-based alloy inert anode applicable to an aluminum electrolytic cell. An alloy material is formed by following base elements in mass percentage of 37-76% of Cu, 15-30% of Ni, 5-15% of Fe and 4-8% of Al. The alloy material applicable to the inert anode of the metal molten salt electrolytic cell disclosed by the invention is applicable to a low-temperature (700-850 DEG C) electrolyte system. An alloy anode has good high-temperature anti-oxidization property and electrolyte corrosion resistance in an electrolysis process and the quality of an electrolyzed aluminum product is more than 99.7%.

Description

technical field [0001] The invention discloses an alloy material suitable for an inert anode of a metal molten salt electrolytic cell, relating to a metal molten salt electrolysis, in particular an alloy material suitable for a carbon-free, metal-based alloy inert anode of an aluminum electrolytic cell. Background technique [0002] As a light metal, the application of aluminum and its alloys is of great significance to global energy conservation. In order to pursue the sustainable development of primary aluminum electrolysis production process, huge energy consumption and serious environmental pollution are problems that need to be solved urgently. [0003] Currently, consumable carbon anodes are widely used in many metallurgical molten salt electrolysis industries, such as the smelting of aluminum and rare earth metals. Compared with the traditional carbon anode, the development of inert anode material and inert anode technology can significantly save energy in the product...

Claims

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Application Information

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IPC IPC(8): C22C9/00C22C9/06C22C30/02C25C7/02C25C3/00C25C3/12
Inventor 杨建红李旺兴彭伟平
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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