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Inert anode material for aluminium electrolysis and method for manufacturing same

An inert anode and aluminum electrolysis technology, applied in the field of anode materials, can solve the problems of low strength and toughness, brittleness, and poor thermal shock resistance of spinel, and achieve the effects of saving carbon resources, avoiding pollution, and improving toughness

Active Publication Date: 2010-07-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Although a lot of research has been done on cermet inert anodes and great achievements have been made, they have not been applied industrially. There are two main problems: first, their thermal shock resistance is poor. When the anode is immersed in a high-temperature molten electrolyte at room temperature When it is in the middle, cracks occur on the surface, and even break into small pieces and fall into the molten aluminum at the bottom of the tank, so that the electrolytic production cannot be carried out normally; the second is NiFe 2 o 4 Spinel has low strength and toughness, which makes the anode sample easy to break during handling and connection with the conductive rod

Method used

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  • Inert anode material for aluminium electrolysis and method for manufacturing same
  • Inert anode material for aluminium electrolysis and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation process of the inert anode material can be carried out according to the process flow in Fig. 1, and the inert anode material with the size of 200mm×300mm×80mm is prepared. Weigh 8429g NiO, 15571g Fe 2 o 3 and 240.0g V 2 o 5 , mixed for 12 hours, dried at 100°C, ground into powder, sieved and granulated through a standard sieve with an aperture of 60 mesh, then added 1212.0g of polyvinyl alcohol binder, after mixing evenly, cold isostatic pressing at room temperature 40MPa Forming, pre-sintering at 900°C in a silicon carbide rod furnace, holding time 8h, synthesis of NiFe 2 o 4 Spinel matrix material. NiFe obtained by pre-sintering 2 o 4 The spinel matrix material is crushed. When the particle size is graded, coarse particles account for 35%, with a particle size of 0.6-2.0mm; medium particles account for 25%, and the particle size is 0.15-0.6mm; fine powder accounts for 40%. The diameter is less than 0.15mm, and the particle size in the fine powd...

Embodiment 2

[0043] The preparation process of the inert anode material can be carried out according to the process flow in Fig. 1, and the inert anode material with the size of 200mm×300mm×80mm is prepared. Weigh 8429g NiO, 15571g Fe 2 o 3 and 120.0gMnO 2 , mixed for 14 hours, dried at 100°C, ground into powder, sieved and granulated through a standard sieve with an aperture of 60 mesh, then added 1206.0g of polyvinyl alcohol binder, mixed evenly, and molded at room temperature at 60MPa. Carry out pre-sintering at 1000°C in a silicon carbide rod furnace, and the holding time is 7h to synthesize NiFe 2 o 4 Spinel matrix material. NiFe obtained by pre-sintering 2 o 4 The spinel matrix material is crushed. When the particle size is graded, coarse particles account for 40% with a particle size of 0.6-2.0mm; medium particles account for 15% with a particle size of 0.15-0.6mm; fine powder accounts for 45%. The diameter is less than 0.15mm. Add 1266.3g of Ag powder, 126.63g of carbon fib...

Embodiment 3

[0045] The preparation process of the inert anode material can be carried out according to the process flow in Fig. 1, and the inert anode material with the size of 200mm×300mm×80mm is prepared. Weigh 8429g NiO, 15571g Fe 2 o 3 、360.0g V 2 o 5 and 240.0gMnO 2 , mixed for 16 hours, dried at 100°C, ground into powder, sieved and granulated through a standard sieve with an aperture of 60 mesh, then added 1230.0g of polyvinyl alcohol binder, mixed evenly, and cooled isostatically at room temperature 80MPa Compression molding, pre-sintering at 1200°C in a silicon carbide rod furnace, holding time 4h, synthesis of NiFe 2 o 4 Spinel matrix material. NiFe obtained by pre-sintering 2 o 4 The spinel matrix material is crushed. When the particle size is graded, coarse particles account for 45% with a particle size of 0.6-2.0mm; medium particles account for 20% with a particle size of 0.15-0.6mm; fine powder accounts for 30%. The diameter is less than 0.15mm. Add 1285.5g of Cu p...

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Abstract

The invention relates to an inert anode material for aluminum electrolysis and preparation method. The inert anode material comprises NiFe2O4 ceramic phase, Ag powder or / and Cu powder metallic phase and fiber phase, characterized in that adding MnO2, V2O5 in the ceramic phase, adding carborundum fibre, carbon fiber, boron fibre, silicon nitride fibre in the fibre phase. In the NiFe2O4 ceramic phase, the NiO and F2O3 is taken as raw material, synthesizing NiFe2O4 spinel according to stoichiometric ratio, NiO excessive 15wt%; based on total mass of NiO and Fe2O3, adding at least one of 0.5wt% to 2.5wt% MnO, 1.0wt% to 3.0wt% V2O5 to compose NiFe2O4 spinel base material; after the NiFe2O4 spinel base material is smashed and screened, processing grain size distribution according to crude grainmaterial, mediate grain material and fined powder material. Based on the total mass of the NiFe2O4 spinel base material, adding at least one of 5wt% to 15wt% Ag powder, 5wt% to 30wt% Cu powder, than further adding at least one of 0.5wt% to 5wt% carborundum fibre, 0.5wt% to 5wt% carbon fiber, 0.5wt% to 10wt% boron fibre, 0.5wt% to 10wt% silicon nitride. The product has higher anti-erosion property, thermal-shock resistance, bend strength and anti-impact strength properties.

Description

technical field [0001] The invention relates to an anode material resistant to high temperature molten salt corrosion, in particular to an inert anode material for aluminum electrolysis. Background technique [0002] Since its invention in 1886, the Hall-Heroud process has been used to produce almost all commercial aluminum. Although many process parameters have been optimized since the invention of this method, its basic characteristics are still the same, the anodes are all carbon anodes. A large amount of pitch fume is generated during the carbon anode fabrication process. During the electrolysis process, the oxygen precipitated on the anode reacts with the carbon anode to generate a large amount of CO 2 and CO gas, the current prebaked anode aluminum electrolyzer produces 1.54 tons of CO per ton of primary aluminum 2 ; At the same time, the anode carbon will react with the fluorine in the electrolyte to generate CF when the anode effect occurs 4 and C 2 f 6 These g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/12
Inventor 姚广春刘宜汉罗洪杰张晓明吴林丽祖国胤曹卓坤马佳
Owner NORTHEASTERN UNIV
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