Cu-Ni-Fe-based alloy inert anode material and heat treatment method thereof

A heat treatment method and cu-ni-fe technology are applied in the field of high-temperature molten salt aluminum electrolytic alloy inert anode materials and their homogenization heat treatment to achieve the effects of improving the purity of primary aluminum, reducing the low life of the anode and improving the electrolysis efficiency

Active Publication Date: 2014-10-01
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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The heat treatment process of the alloy described in the lit

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  • Cu-Ni-Fe-based alloy inert anode material and heat treatment method thereof

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Embodiment 1

[0036] An alloy material suitable for the inert anode of the metal molten salt electrolytic cell, the alloy mass composition is: 54% copper, 30% nickel, 16% iron. The anode is subjected to homogenization heat treatment in a high-temperature vacuum quenching furnace. The heat treatment process is:

[0037] Step 1: Vacuumize the vacuum quenching furnace to 10 at room temperature -1 -10 -2 Pa, then open the gas supply valve and fill in high-purity nitrogen to a vacuum of 500Pa;

[0038] Step 2: Slowly heat the alloy to 1250°C at a heating rate of 5°C / min, and keep it warm for 40 hours to fully dissolve the dual-phase dendrite structure formed during the alloy casting process;

[0039] Step 3: After the heat preservation is over, quickly open the inflation valve, fill the furnace with an inert protective gas to 4.5 atmospheres, and the inflation time is 30s;

[0040] Step 4: Turn on the cooling fan quickly after inflating to implement rapid cooling and quenching. The entire coo...

Embodiment 2

[0043] An alloy material suitable for the inert anode of the metal molten salt electrolytic cell, the alloy mass composition is: 30% copper, 38% nickel, 32% iron. The anode is subjected to high-temperature homogenization treatment in a high-temperature vacuum quenching furnace, and the heat treatment process is as follows:

[0044] Step 1: Vacuumize the vacuum quenching furnace to 10 at room temperature -1 -10 -2 Pa, then open the air supply valve and fill in high-purity nitrogen to a vacuum of 300Pa;

[0045] Step 2: Slowly heat the alloy to 1280°C at a heating rate of 5°C / min, and keep it warm for 24 hours to fully dissolve the dual-phase dendrite structure formed during the casting process of the alloy;

[0046] Step 3: After the heat preservation is over, quickly open the inflation valve, fill the furnace with an inert protective gas to 4.8 atmospheres, and the inflation time is 35s;

[0047] Step 4: Turn on the cooling fan quickly after inflating to implement rapid coo...

Embodiment 3

[0050] An alloy material suitable for the inert anode of the metal molten salt electrolytic cell, the alloy composition mass percentage is: 52% copper, 28% nickel, 12% iron, 8% Al. The anode is subjected to high-temperature uniform treatment in a high-temperature vacuum quenching furnace. The heat treatment process is as follows:

[0051] Step 1: Vacuumize the vacuum quenching furnace to 10 at room temperature -1 -10 -2 Pa, then open the gas supply valve and fill in high-purity nitrogen to a vacuum of 500Pa;

[0052] Step 2: Slowly heat the alloy to 1100°C at a heating rate of 4°C / min, hold for 10 hours, then slowly raise the temperature to 1200°C at a heating rate of 1°C / min, and hold for 24 hours to make the double The phase dendrite structure is fully dissolved, and the NiAl phase is slowly dissolved back, showing a fine needle shape;

[0053] Step 3: After the heat preservation is over, quickly open the inflation valve, fill the furnace with an inert protective gas to 4...

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Abstract

The invention provides a Cu-Ni-Fe-based alloy inert anode material and a heat treatment method thereof and relates to a high temperature fused salt aluminium electrolysis alloy inert anode material and a homogenization heat treatment method thereof. The Cu-Ni-Fe-based alloy inert anode material is characterized by comprising the following components in mass ratio: 28-72% of Cu, 18-42% of Ni and 12-34% of Fe, wherein the sum of the mass percentages of the three elements is 92-100%. The alloy is subjected to vacuum homogenizing heat treatment, so that a uniform homogeneous structure or a fine second phase is dispersed and distributed on a uniform anode base. When the inert anode material is electrolyzed in a KF-NaF-AlF3-Al2O3 system, efficiency can reach up to 95%, and impurity content of primary aluminium is lower than 0.5%.

Description

technical field [0001] A Cu-Ni-Fe-based alloy inert anode material and a heat treatment method thereof relate to an inert anode material used in high-temperature molten salt aluminum electrolysis alloys and a homogenization heat treatment method thereof. Background technique [0002] As a light metal, the application of aluminum and its alloys is of great significance to global energy conservation. 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. 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] The development of energy-saving and environment-friendly aluminum electrolysis technology based on inert electrode materials is the fu...

Claims

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Application Information

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IPC IPC(8): C22C30/02C22C9/00C22C9/06C22F1/00C22F1/08C25C3/12
Inventor 杨建红刘英彭伟平张刚杨文杰李冬生郭洁
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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