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Spinel type nickel aluminate base metal ceramic inert electrode

An inert electrode and spinel-type technology, which is applied in the field of spinel-type nickel-aluminate-based cermet inert electrodes, can solve the problem that the carbon side wall is easily corroded, the service life of the electrolytic cell is short, and the production efficiency of the electrolytic cell is low and other issues to achieve the effect of improving the degree of automation and labor productivity, prolonging life, and reducing production costs

Inactive Publication Date: 2007-02-21
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing aluminum smelting method is still the cryolite-alumina molten salt electrolysis method; the main equipment for aluminum smelting is the electrolytic cell, and the process itself still has many shortcomings: the energy utilization rate is quite low, less than 50%; the cathode It is consumable, and the production of each ton of aluminum needs to consume 450-500kg of carbon anode; the carbon side wall is easily corroded, and the service life of the electrolytic cell is short; because its electrodes are arranged horizontally, only one reaction surface produces aluminum, resulting in electrolysis The production efficiency of the tank is very low, and at the same time, a large amount of CO is emitted into the environment 2 , CO and asphalt fume and other harmful gases
Most of the existing inert anodes are based on nickel ferrite (NiFe 2 o 4 ) cermet material, which is still corroded by the electrolyte during use, so that the iron in the anode dissolves into the electrolyte, and the iron is precipitated at the cathode, which affects the purity of aluminum
Therefore, this material has been limited in industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] NiAl 2 o 4 Powder: NiFe 2 o 4 powder=60%: 40% mixed evenly, and then evenly mixed with the prepared 200 mesh Cu-Ag-Ni alloy powder, the weight percent example is NiAl 2 o 4 and NiFe 2 o 4 Composite cermet powder: Cu-Ag-Ni alloy powder = 88%: 12%, and then adopt the method of cold pressing and sintering to make a crucible-shaped electrode with a size of 60*60mm and a wall thickness of 5mm, and perform electrolysis in a self-made electrolytic cell , Electrolyte composition: Al 2 o 3 5%, CaF 2 3%, MgF 2 3%, NaCl3%, and the rest is industrial cryolite with a molecular ratio of 2.1. The electrolysis temperature is 900°C, and the anode current density is 0.85A / cm 2 Electrolysis for 24 hours; anode corrosion is slight, and the purity of the obtained aluminum is 99.6% Al.

example 2

[0019] NiAl 2 o 4 Powder: NiFe 2 o 4 Powder=50%: 50% are evenly mixed, and then evenly mixed with the prepared 200 mesh Cu-Ag-Ni alloy powder, and its weight percentage is NiAl 2 o 4 and NiFe 2 o 4 Composite cermet powder: Cu-Ag-Ni alloy powder=80%: 20%, then, adopt the cold press sintering method to make the crucible-type electrode that size is 60*60mm, wall thickness is 5mm, in the self-made electrolyzer Perform electrolysis, the electrolyte composition is: Al 2 o 3 3%, CaF 2 3%, MgF 2 5%, LiF3%,

[0020] The rest is industrial cryolite with a molecular ratio of 2.1.

[0021] Electrolysis temperature is 900°C

[0022] The anode current density is 0.85A / cm 2

[0023] Electrolysis for 48 hours

[0024] Anode corrosion is slight, and the purity of aluminum is 99.6% Al.

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Abstract

The present invention relates to a spinelle type nickel aluminate base metal ceramic indifferent electrode for aluminium electrolysis. Said indifferent electrode component includes nickel aluminte base metal ceramics or nickel aluminate and nickel ferrite composite metal ceramics and copper-nickel series multicomponent alloy powder, and the above-mentioned materials and undergone the process of cold-press sintering or hot pressing method so as to obtain the indifferent anode with a certain size and thickness. The purity of said aluminium product is 99.6% Al.

Description

Technical field [0001] The invention belongs to electrodes for aluminum electrolysis, in particular to a spinel-type nickel aluminate-based cermet inert electrode. Background technique [0002] The existing aluminum smelting method is still the cryolite-alumina molten salt electrolysis method; the main equipment for aluminum smelting is the electrolytic cell, and the process itself still has many shortcomings: the energy utilization rate is quite low, less than 50%; the cathode It is consumable, and the production of each ton of aluminum needs to consume 450-500kg of carbon anode; the carbon side wall is easily corroded, and the service life of the electrolytic cell is short; because its electrodes are arranged horizontally, only one reaction surface produces aluminum, resulting in electrolysis The production efficiency of the tank is very low, and at the same time, a large amount of CO is emitted into the environment 2 , CO and asphalt fume and other harmful gases. The us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/08
Inventor 邱竹贤王兆文高炳亮
Owner NORTHEASTERN UNIV LIAONING
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