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TiB2-based composite cathode material used for aluminium electrolysis and preparation method thereof

A composite cathode and aluminum electrolysis technology, which is applied in the field of TiB2-based composite cathode materials for aluminum electrolysis and its preparation, can solve the problems of high equipment requirements, poor chemical stability, and poor thermal shock resistance, and achieve excellent mechanical properties and electrical conductivity. Good, strong corrosion resistance effect

Inactive Publication Date: 2015-07-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, research on wettable cathode materials mainly focuses on: TiB 2 -C composite cathode material, TiB 2 Pure ceramic cathode materials and TiB 2 Coated cathode materials, etc. From the literature reports, they have the characteristics of wettable cathode materials, but they all have defects to varying degrees. TiB 2 The carbon binder in the -C composite cathode material is carbonized, and the coke reacts with the aluminum liquid to form Al at the interface between the aluminum liquid and the cathode. 4 C 3 , resulting in TiB 2 Particles fall off, the porosity of the composite material increases, and the material life is short; TiB 2 Pure ceramic cathode materials have high sintering temperature, poor compactness, high brittleness, poor thermal shock resistance, and cannot meet the technical requirements of aluminum electrolysis cathode materials; TiB 2 Coated cathode materials have a short lifespan, and the coating efficacy is difficult to maintain for a long time
Traditional TiB 2 -Al 2 o 3 The sintering temperature of the composite ceramic cathode material is relatively high, reaching 1700-1900°C. The sintering of this material requires high equipment, which greatly increases the production cost.
While some of the currently studied TiB 2 / Metal composite cathode material, because the metal phase is introduced into the composite material, although it is beneficial to improve the sintering performance of the composite material, the chemical stability of the metal phase in molten aluminum liquid and electrolyte is poor, resulting in shortened life of the composite material and reduction of primary aluminum products quality, therefore, it is not suitable for electrolytic aluminum cathode material

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  • TiB2-based composite cathode material used for aluminium electrolysis and preparation method thereof
  • TiB2-based composite cathode material used for aluminium electrolysis and preparation method thereof
  • TiB2-based composite cathode material used for aluminium electrolysis and preparation method thereof

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preparation example Construction

[0024] (1) Preparation of sol

[0025] First, configure the corresponding sol with a solid content of 5-30mass%, to ensure that the particle size of the sol is 40-100nm.

[0026] (2) Mixing

[0027] According to the requirements of the above process formula, each material is weighed or measured in proportion, and the TiB 2 Powder (particle size 3-100μm), nano-sol, additives, reinforcing agent (the diameter of the fiber reinforcing agent is 40-350μm, the average size of the particle reinforcing agent is 30-60μm) mixed and stirred for 25-35min to make a uniform paste and dried Afterwards, re-crushing and sieving to obtain the desired powder.

[0028] (3) Forming

[0029] At room temperature, the solid material is loaded into a mold, pre-pressed under a pressure of 25-30kN, and then cold-pressed under a pressure of 50-65kN for 5-10 minutes to obtain TiB 2 Base composite cathode material green body.

[0030] (4) Sintering

[0031]One of vacuum sintering, reducing atmosphere ...

Embodiment 1

[0066] The raw material used is TiB 2 、Al 2 o 3 Sol, NiO Sol, Na 3 AlF 6 powder, carbon fiber and SiC fiber.

[0067] Table 3 Embodiment 1 raw material ratio

[0068] Element TiB 2 al 2 o 3 sol NiO sol cryolite carbon fiber SiC fiber Content (mass%) 73.5 12 8 5 0.75 0.75

[0069] In this embodiment, compression molding is used to make a green body, and then sintered. The steps are as follows:

[0070] (1) Preparation of sol

[0071] First configure Al with a solid content of 10mass% 2 o 3 Sol, to ensure that the particle size of the sol is 40-100nm; configure NiO sol with a solid content of 10mass%, to ensure that the particle size of the sol is 40-100nm.

[0072] (2) Ingredients

[0073] The material composition involved in this embodiment is: TiB 2 The addition amount is 73.5mass%, Al 2 o 3 The addition amount of sol is 12mass%, the addition amount of NiO sol is 8mass%, the addition amount of cryolite is 5mass%, the addit...

Embodiment 2

[0080] The raw material used is TiB 2, Fe 2 o 3 Sol, NiO sol, AlF 3 powder, NaF powder and B 4 C particles.

[0081] Table 4 Embodiment 2 raw material proportioning

[0082] Element TiB 2 Fe 2 o 3 sol NiO sol AlF 3 NaF B 4 C particles Content (mass%) 76.5 13 6 1.5 1.5 1.5

[0083] In this embodiment, compression molding is used to make a green body, and then sintered. The steps are as follows:

[0084] (1) Preparation of sol

[0085] First configure Fe with a solid content of 15mass% 2 o 3 Sol, to ensure that the particle size of the sol is 40-100nm; configure NiO sol with a solid content of 15mass%, to ensure that the particle size of the sol is 40-100nm.

[0086] (2) Ingredients

[0087] The material composition involved in this embodiment is: TiB 2 The addition amount is 76.5mass%, Fe 2 o 3 The amount of sol added is 13mass%, the amount of NiO sol added is 6mass%, and the amount of AlF 3 Addition amount is 1.5mass%, N...

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Abstract

The invention discloses a TiB2-based composite cathode material used for aluminium electrolysis and a preparation method thereof, the TiB2-based composite cathode material used for aluminium electrolysis takes TiB2 powder, nano sol, an additive and a reinforcing agent as raw materials, and the preparation method is characterized in that the raw materials are uniformly mixed and formed, and sintered under appropriate atmosphere to obtain the TiB2-based composite cathode material. The material takes spinel as a continuous sintering phase, and has the advantages of good sintering performance and low sintering temperature, the product has good conductivity, mechanical property and corrosion resistance, and is completely wetted with aluminum liquid, so that the material is an ideal wettable cathode material for aluminium electrolysis.

Description

technical field [0001] The invention belongs to the field of new cathode material for aluminum electrolysis and its preparation, and in particular relates to a TiB for aluminum electrolysis 2 Based composite cathode material and its preparation method. Background technique [0002] The Hall-Heroult method is the only industrial aluminum smelting method in the world today. In the current aluminum electrolysis industry, the cathode material not only plays the role of carrying current, but also bears the chemical erosion of the high-temperature electrolyte melt and the physical erosion of the aluminum liquid. The current cell has always used carbonaceous materials as the cathode material. However, the carbon cathode and The molten metal aluminum does not wet. In order to keep the surface of the molten metal cathode stable and avoid short circuit, 18-30 cm of molten metal aluminum must be kept in the current aluminum electrolytic cell, aiming to stabilize the carbon by the grav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622C04B35/80
Inventor 吕晓军胡凌云李劼张红亮
Owner CENT SOUTH UNIV