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Nickel-based alloy material suitable for inert anode of metal molten salt electrolyzer

A molten salt electrolysis, inert anode technology, used in metal-based inert anode alloy materials, carbon-free fields, to achieve good high temperature oxidation resistance, good high temperature oxidation resistance and electrolyte corrosion resistance, good robustness and anti-interference performance Effect

Inactive Publication Date: 2011-04-13
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Although extensive and in-depth research and exploration have been carried out on inert anode materials aimed at replacing carbon anodes, there are still no successful inert anode materials for industrial applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An alloy material suitable for the inert anode of the metal molten salt electrolytic cell, the mass composition of the alloy is: 15% iron, 12% aluminum, 5% copper, and the rest is nickel. The alloy is melted and casted in an intermediate frequency induction furnace, and the ingot is processed to form an anode product. In KF-NaF-AlF 3 -Al 2 o 3 In the system 20A electrolysis test, the electrolysis temperature is 900°C, and the anode current density is 0.5A / cm 2 , the average electrolysis voltage is about 4.6V, and the primary aluminum with a quality of 99.8% can be obtained by electrolysis for 24 hours.

Embodiment 2

[0036] An alloy material suitable for the inert anode of the metal molten salt electrolytic cell, the mass composition of the alloy is: 50% iron, 3% aluminum, 20% copper, and the rest is nickel. The alloy is smelted and cast in a medium frequency induction furnace at a temperature range of 1400-1600°C, and the ingot is processed to form an anode product. In KF-NaF-AlF 3 -Al 2 o 3 In the system 20A electrolysis test, the electrolysis temperature is 900°C, and the anode current density is 0.5A / cm 2 , the average electrolysis voltage is about 3.5V, and the primary aluminum with a quality of more than 99.7% can be obtained by electrolysis for 24 hours.

Embodiment 3

[0038] An alloy material suitable for the inert anode of the metal molten salt electrolytic cell, the mass composition of the alloy is: 20% iron, 12% aluminum, 12% copper, 0.05% lanthanum, 2% chromium, 0.1% silicon , the rest being nickel. The alloy is melted in a vacuum induction furnace at a temperature range of 1400-1600 ° C, and then cooled and cast by a water-cooled mold. The ingot is cut into small discs with a diameter of 25 mm and a thickness of 3 mm after heat treatment. The high-temperature oxidation resistance test was carried out at 850°C, and the oxidation time was 200 hours. The results showed that the oxidation weight gain rate of the alloy was 0.007 mg / cm 2 h.

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Abstract

The invention provides a nickel-based alloy material suitable for an inert anode of a metal molten salt electrolyzer, relates to metal molten salt electrolysis, in particular to an alloy material suitable for carbon-free metal-based alloy inert anode of an aluminum electrolyzer. The nickel-based alloy material is characterized by comprising the following components in percentage by mass: 5 to 20 percent of Cu, 3 to 15 percent of Al, 15 to 50 percent of Fe, and the balance of Ni. By the invention, the alloy material suitable for the inert anode of the metal molten salt electrolyzer is obtained, and is suitable for a low-temperature (700 to 850 DEG C) electrolysis system. The alloy anode expresses excellent high-temperature oxidation resistance and electrolysis corrosion resistance in the electrolyzing process, and the quality of an electrolyzed aluminum product reaches over 99.7 percent.

Description

technical field [0001] The invention relates to a nickel-based alloy material suitable for an inert anode of a metal molten salt electrolytic cell, in particular to a metal molten salt electrolysis, especially suitable for a carbon-free, metal-based inert anode alloy material 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 the primary aluminum electrolysis production process, it is necessary to solve a series of problems such as huge energy consumption and serious environmental pollution. [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 en...

Claims

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Application Information

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IPC IPC(8): C25C3/00C25C3/12
Inventor 杨建红李旺兴彭伟平肖阳郭洁
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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