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Rare earth-containing Cu-Ni-Fe alloy inert anode material and heat treatment method thereof

A heat treatment method and cu-ni-fe technology are applied in the field of heat treatment of high-temperature molten salt aluminum electrolytic alloy inert anode materials to achieve the effects of reducing the impurity content of aluminum ingots, improving electrolytic performance, and improving anode corrosion resistance.

Active Publication Date: 2014-04-09
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat treatment process of the alloy described in the literature is only for the Cu-Ni-Fe ternary alloy, which has deficiencies and needs to be improved

Method used

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  • Rare earth-containing Cu-Ni-Fe alloy inert anode material and heat treatment method thereof

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Effect test

Embodiment 1

[0033] An alloy material suitable for the inert anode of the metal molten salt electrolytic cell, the alloy mass composition is: 47.5% copper, 30% nickel, 15% iron, 5% aluminum, 2.5% La. The anode is subjected to double-stage homogenization and double-stage aging treatment in a high-temperature vacuum quenching furnace. The heat treatment process is:

[0034] Step 1: Slowly heat the alloy to 840°C at a heating rate of 4°C / min, and keep it warm for 6 hours, so that the low melting point rare earth phase is fully re-dissolved;

[0035] Step 2: Continue heating the alloy to 1200°C at a heating rate of 10°C / min and keep it warm for 40 hours to dissolve the coarse NiAl phase during casting and eliminate the dendrite structure in the cast state to obtain a uniform single-phase structure;

[0036] Step 3: Perform rapid gas jet quenching on the alloy at high temperature, keep the cooling rate at 5-20°C / s, and continue jetting until the alloy is cooled below 400°C to obtain the supersa...

Embodiment 2

[0041] An alloy material suitable for the inert anode of the metal molten salt electrolytic cell, the alloy mass composition is: 49.5% copper, 30% nickel, 15% iron, 5% aluminum, 0.5% La. The anode is subjected to double-stage homogenization and double-stage aging treatment in a high-temperature vacuum quenching furnace. The heat treatment process is:

[0042] Step 1: Slowly heat the alloy to 840°C at a heating rate of 4°C / min, and keep it warm for 4 hours to fully dissolve the low melting point rare earth phase;

[0043] Step 2: Continue heating the alloy to 1200°C at a heating rate of 10°C / min and keep it warm for 40 hours to melt back the coarse NiAl phase during the casting process and eliminate the as-cast dendrite structure to obtain a uniform single-phase structure;

[0044] Step 3: Perform rapid gas jet quenching on the alloy at high temperature, keep the cooling rate at 5-20°C / s, and continue jetting until the alloy is cooled below 400°C to obtain the supersaturated so...

Embodiment 3

[0049] An alloy material suitable for the inert anode of the metal molten salt electrolytic cell, the alloy composition mass percentage is: 51.5% copper, 30% nickel, 18% iron, 0.5% Y. The anode is subjected to double-stage homogenization and double-stage aging treatment in a high-temperature vacuum quenching furnace. The heat treatment process is:

[0050] Step 1: Slowly heat the alloy to 850°C at a heating rate of 4°C / min, and keep it warm for 4 hours to fully dissolve the low-melting rare earth phase;

[0051] Step 2: Continue heating the alloy to 1180°C at a heating rate of 10°C / min, and hold it for 24 hours to eliminate the Cu-rich and NiFe-rich dual-phase structure formed during the casting process to obtain a uniform single-phase structure;

[0052] Step 3: Perform rapid gas jet quenching on the alloy at high temperature, keep the cooling rate at 5-20°C / s, and continue jetting until the alloy is cooled below 400°C to obtain a single-phase supersaturated solid solution st...

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Abstract

The invention discloses a rare earth-containing Cu-Ni-Fe alloy inert anode material and a heat treatment method thereof, and relates to an aluminum electrolysis alloy inert anode material, and a heat treatment method suitable for the high-temperature molten salt aluminum electrolysis alloy inert anode material. The inert anode material comprises 35-65mass% of Cu, 20-35mass% of Ni and 15-30mass% of Fe, and the sum of the mass percentages of the above three elements is 92.5-99.9%. The heat treatment method of the inert anode material comprises the following steps: carrying out heating, heat insulation and strong cooling quenching for homogenization heat treatment to obtain a uniform supersaturated solid solution structure, and carrying out two-stage ageing heat treatment to obtain a fine and uniform second phase dispersed and distributed on an anode matrix. The uniformly dispersed anode matrix structure has a stationary voltage in the electrolytic process, and has a good high-temperature oxidation resistance and a good electrolyte corrosion resistance, and the impurity content in an electrolysis aluminum product is lower than 0.5%.

Description

technical field [0001] A rare earth-containing Cu-Ni-Fe alloy inert anode material and a heat treatment method thereof relate to an aluminum electrolytic alloy inert anode material and a heat treatment method suitable for high-temperature molten salt aluminum electrolytic alloy inert anode materials. Background technique [0002] As the second largest metal after steel, aluminum has an important strategic position in national economic and social development. The production of primary aluminum still uses the Hall-heroult process so far. While the electrolysis process consumes a lot of electricity, it also emits a lot of greenhouse gases such as carbon dioxide and fluorocarbons. [0003] The development of energy-saving and environment-friendly aluminum electrolysis technology based on inert electrode materials is the fundamental way to upgrade and transform the aluminum electrolysis industry to energy-saving and environment-friendly development, so as to achieve the goal of z...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/06C22C9/00C22C30/02C22C30/04C22C30/06C22F1/08C22F1/00C25C3/12
Inventor 刘英彭伟平杨建红郭洁李旺兴
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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