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Sintering process for preparing FeAl-NiO-Fe2O3 composite material metal ceramic inert anode

A feal-nio-fe2o3, inert anode technology, applied in the field of non-ferrous metal metallurgical molten salt electrolysis, can solve the problems of high cost and large pollution, and achieve the effect of good electrical conductivity and corrosion resistance

Pending Publication Date: 2022-02-11
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to address the above-mentioned deficiencies and provide a cermet inert anode that can be used in the aluminum electrolysis industry to solve the problems of large pollution and high cost during the use of carbon materials in the current aluminum electrolysis industry

Method used

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  • Sintering process for preparing FeAl-NiO-Fe2O3 composite material metal ceramic inert anode
  • Sintering process for preparing FeAl-NiO-Fe2O3 composite material metal ceramic inert anode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Ball mill Fe-Al metal powder for 48h, mix NiO and Fe 2 o 3 Ball milling for 6 hours, passing through a 60-mesh standard sieve for grinding and granulation, and forming by a hydraulic press with a forming pressure of 20 MPa. Put it into a spark plasma sintering furnace for sintering, set the temperature to 700°C, set the holding time to 6min, and adjust the pressure to 4Mpa. The schematic diagram of the spark plasma sintering furnace device is shown in figure 1 .

[0021] Observation of the sintered samples shows that the samples are well densified and there is no exposed metal phase aggregation phenomenon. The sintered samples 1#, 2#, and 3# were oxidized at 800°C for 25 hours under the same conditions, and the weight gain was 26.61mg / cm respectively. 2 、25.63mg / cm 2 、23.70mg / cm 2 .

[0022] Taking the average value, the weight gain of the cermet material is about 25.31mg / cm after the sample is subjected to 800°C for 25h 2 , After 25h, the weight gain of the samp...

Embodiment 2

[0024] Ball mill Fe-Al metal powder for 48h, mix NiO and Fe 2 o 3 Ball milling for 6 hours, passing through a 60-mesh standard sieve for grinding and granulation, and forming by a hydraulic press with a forming pressure of 20 MPa. Put it into a spark plasma sintering furnace for sintering, set the temperature to 750°C, set the holding time to 15min, and adjust the pressure to 4Mpa.

[0025] Observing the sintered sample under the same conditions will reveal that there will be metal deposition at the bottom of the sample, the metal phase will be exposed obviously, and the pores inside the sample will increase.

Embodiment 3

[0027] Ball mill Fe-Al metal powder for 48h, mix NiO and Fe 2 o 3 Ball milling for 6 hours, passing through a 60-mesh standard sieve for grinding and granulation, and forming by a hydraulic press with a forming pressure of 20 MPa. Put it into a spark plasma sintering furnace for sintering, set the temperature to 800°C, set the holding time to 20min, and adjust the pressure to 4Mpa.

[0028] Observing the sintered sample under the same conditions will reveal that the powder inside the sample is bonded, the metal phase is agglomerated, and the sintered product is not dense.

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Abstract

The invention relates to the field of aluminum electrolysis industry, and in particular, relates to a composite material metal ceramic inert anode prepared in a spark plasma sintering mode and a preparation technology thereof. The composite material metal ceramic inert anode is suitable for an electrolyte system at the temperature of 800 DEG C or below. In the aluminum electrolysis process, the inert electrode serves as an anode, and oxygen is generated on the surface, so that the purpose of eliminating emission of greenhouse effect gas CO2 is achieved, and the current purpose of protecting the environment is met. NiO-Fe2O3-FeAl is used as a raw material system, sintering is conducted through a discharge plasma method, oxidation is conducted in a high-temperature environment after primary forming, finally, particles in an anode sample can form ferronickel spinel, an oxide layer of aluminum oxide can be formed on the surfaces of the particles, and a protective layer of oxide can also be formed on the surface of the sample; therefore, the composite material metal ceramic inert anode has good cryolite molten salt corrosion resistance and high-temperature oxidation resistance, and is good in conductivity.

Description

technical field [0001] The invention relates to the field of molten salt electrolysis of non-ferrous metal metallurgy, and mainly relates to the preparation of an inert anode and its aluminum electrolysis. Background technique [0002] The current domestic production method of aluminum is the cryolite-alumina molten salt electrolysis method, which was patented in 1886 by the Hall of the United States and Elutt of France. Its main principle is to use cryolite as a solvent and alumina as a solute, that is, cryolite-alumina molten salt system, use high-quality carbon materials as anode and cathode, and then feed direct current into the electrolytic cell to make it in the electrode An electrochemical reaction occurs on the anode, and CO is produced at the anode 2 and CO, while the alumina on the cathode decomposes into liquid metallic aluminum. [0003] With the rapid development of smelting technology in the aluminum industry, the application fields and smelting scale of the ...

Claims

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Application Information

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IPC IPC(8): C25C3/12
CPCC25C3/12
Inventor 耿树江纪小龙
Owner NORTHEASTERN UNIV
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