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A nickel ferrite-based ceramic inert anode material for aluminum electrolysis and its preparation method

An inert anode, nickel ferrite-based technology, which is applied in the field of aluminum electrolysis technology and ceramic matrix composite materials, can solve the problem that the conductivity and corrosion resistance of the base metal ceramic inert anode cannot be balanced, and overcome the conductivity and corrosion resistance. Unable to take into account the effects of ensuring purity and reducing manufacturing costs

Active Publication Date: 2021-03-02
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to NiFe 2 o 4 In view of the problem that the electrical conductivity and corrosion resistance of the base metal ceramic inert anode cannot be balanced, a nickel ferrite based ceramic inert anode material for aluminum electrolysis and its preparation method are provided. By doping TiN ceramic phase with excellent electrical conductivity and good oxidation resistance Instead of the metal phase, in increasing the NiFe 2 o 4 The ceramic-based inert anode has good corrosion resistance while ensuring good electrical conductivity, which meets the requirements of the current aluminum electrolysis process, such as high electrical conductivity, high temperature molten salt corrosion resistance, and other properties.

Method used

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  • A nickel ferrite-based ceramic inert anode material for aluminum electrolysis and its preparation method
  • A nickel ferrite-based ceramic inert anode material for aluminum electrolysis and its preparation method
  • A nickel ferrite-based ceramic inert anode material for aluminum electrolysis and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh the raw material Fe respectively according to the mass ratio required by the design 2 o 3 powder, NiO powder, MnO 2 Powder and V 2 o 5 Powder, mass ratio according to Fe 2 o 3 All react with NiO to form NiFe 2 o 4 spinel, the rest with a mass fraction of 17% NiO, MnO 2 The mass fraction is 1%, V 2 o 5 The mass fraction of Fe is 1.5%; where Fe 2 o 3 Powder particle size≤1μm, NiO powder particle size≤10μm, MnO 2 Powder particle size≤5μm, V 2 o 5 Powder particle size ≤100μm;

[0031] Put all the raw materials into a ball mill tank, add deionized water to wet mill and mix for 6 hours, and then dry the mixed material at 100±2°C;

[0032] Add polyvinyl alcohol solution with an organic binder mass fraction of 8% to the dried mixed material, the organic binder accounts for 2% of the total mass of the dried mixed material, then mix evenly, and then sieve out the particle size The part of ≤250μm is used as a primary bonding material;

[0033] The primary bo...

Embodiment 2

[0041] Weigh the raw material Fe respectively according to the mass ratio required by the design 2 o 3 powder, NiO powder, MnO 2 Powder and V 2 o 5 Powder, mass ratio according to Fe 2 o 3 All react with NiO to form NiFe 2 o 4 spinel, the rest with a mass fraction of 11% NiO, MnO 2 The mass fraction is 2%, V 2 o 5 The mass fraction of Fe is 1%; where Fe 2 o 3 Powder particle size≤1μm, NiO powder particle size≤10μm, MnO 2 Powder particle size≤5μm, V 2 o 5 Powder particle size ≤100μm;

[0042] Put all the raw materials into a ball mill tank, add deionized water to wet mill and mix for 4 hours, and then dry the mixed material at 100±2°C;

[0043] Add a polyvinyl alcohol solution with a mass fraction of 5% of the organic binder to the dried mixed material, the organic binder accounts for 4% of the total mass of the dried mixed material, then mix evenly, and then sieve out the particle size The part of ≤250μm is used as a primary bonding material;

[0044] The prim...

Embodiment 3

[0052] Weigh the raw material Fe respectively according to the mass ratio required by the design 2 o 3 powder, NiO powder, MnO 2 Powder and V 2 o 5 Powder, mass ratio according to Fe 2 o 3 All react with NiO to form NiFe 2 o 4 spinel, the rest with a mass fraction of 5% NiO, MnO 2 The mass fraction is 3%, V 2 o 5 The mass fraction of Fe is 0.5%; where Fe 2 o 3 Powder particle size≤1μm, NiO powder particle size≤10μm, MnO 2 Powder particle size≤5μm, V 2 o 5 Powder particle size ≤100μm;

[0053] Put all the raw materials into a ball mill tank, add deionized water to wet mill and mix for 8 hours, and then dry the mixed material at 100±2°C;

[0054] Add polyvinyl alcohol solution with an organic binder mass fraction of 2% to the dried mixed material, the organic binder accounts for 6% of the total mass of the dried mixed material, then mix evenly, and then sieve out the particle size The part of ≤250μm is used as a primary bonding material;

[0055] The primary bon...

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Abstract

A nickel-ferrite-based ceramic inert anode material for aluminum electrolysis and a preparation method thereof, the phase of the anode material is composed of NiFe 2 o 4 Matrix composite ceramic phase and titanium nitride phase, the ceramic phase is composed of NiFe 2 o 4 , NiO, MnO 2 and V 2 o 5 composition, the nitride phase is TiN x ; The method is: (1) prepare Fe 2 o 3 powder, NiO powder, MnO 2 Powder and V 2 o 5 Powder; wet grinding, mixing and drying, adding binder, mixing and sieving, molding, pre-sintering to obtain blocks, crushing and making granules; (2) wet grinding, mixing and drying of granules and TiN, adding binder, mixing Screening; (3) Cold isostatic pressing; (4) Sintering at 1300-1450°C. The method of the present invention replaces the metal phase with an active ceramic phase, and prepares a ceramic inert anode through a powder metallurgy method, significantly improves the conductivity of the ceramic anode under the premise of ensuring corrosion resistance, and helps to promote the industrial application of the inert anode for aluminum electrolysis.

Description

technical field [0001] The invention relates to the technical fields of aluminum electrolysis technology and ceramic matrix composite material, in particular to a nickel ferrite-based ceramic inert anode material for aluminum electrolysis and a preparation method thereof. Background technique [0002] The current Hall-Héorult aluminum electrolytic cells use consumable carbon anodes, which have problems such as high carbon consumption and serious environmental pollution. With the supervision and control of high carbon consumption and high pollution emission enterprises, the electrolytic aluminum industry is facing a huge crisis; therefore, the aluminum industry urgently needs a new high-efficiency, pollution-free (or less-pollution) aluminum smelting process, such as inert electrodes Process, etc.; the inert anode does not participate in the anode reaction, only oxygen is produced at the anode, and the greenhouse gas CO is eliminated 2 、CF 4 、C 2 f 6 And the emission of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/28C04B35/622C25C3/12
CPCC04B35/265C04B35/622C04B2235/3239C04B2235/3267C04B2235/3279C04B2235/3886C04B2235/5436C04B2235/656C04B2235/9669C25C3/12
Inventor 张志刚卢晓通曹卓坤徐建荣刘宜汉罗洪杰姚广春
Owner NORTHEASTERN UNIV LIAONING
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