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Composite alloy inert anode for aluminum electrolysis and aluminum electrolysis method utilizing same

A composite alloy and inert anode technology is applied to the composite alloy inert anode for aluminum electrolysis and the field of aluminum electrolysis using the anode. Effects of poor thermal shock resistance, wide operating temperature

Active Publication Date: 2010-09-08
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to provide a kind of inert anode suitable for aluminum electrolytic production, the purpose is to solve the greenhouse gas CO brought by carbon as anode in the existing technology. 2 , perfluorocarbon emissions, and the frequent replacement of anodes has forced the continuous production of aluminum electrolysis to stop, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The mass percentage is: 60% copper (Cu): 25% nickel (Ni): 15% iron (Fe) block material, the plate alloy is obtained by smelting, and the groove-shaped anode is obtained by processing, and the anode current density is 0.5A / cm 2 , using plate-like TiB 2 The cathode, the distance between the cathode and the anode is 2.0cm, and the electrolysis system is formed in the potassium cryolite system at 800°C. The cell voltage is stable at 3.7-3.9V during the electrolysis process, and the purity of the primary aluminum obtained by electrolysis reaches 99.1%.

Embodiment 2

[0040] The mass percentage is: 92% copper (Cu): 8% aluminum (Al) powder is mixed evenly, and a cylindrical alloy is obtained by melting, and the surface of the alloy is polished, cleaned, and dried, and then formed on the surface of the electrode by electrodeposition. 50 μm film (85wt% copper (Cu): 15wt% aluminum (Al)), at 700 ° C in 10vt% oxygen (O 2 ): 90vt% nitrogen (N 2 ) atmosphere for 3h, so that the thickness of the surface oxide film is 200μm, to obtain the desired anode, the anode current density is 0.7A / cm 2 , using arc-shaped TiB 2 Coated cathode, the cathode-anode distance is 1.5cm, in the sodium cryolite system at 940°C, the electrolysis system is formed, the cell voltage is stable at 3.6-3.8V during the electrolysis process, and the purity of the primary aluminum obtained by electrolysis reaches 98.3%.

Embodiment 3

[0042] The mass percentage is: 10% copper (Cu): 45% tin (Sn): 45% iron (Fe) powders are mixed evenly, and the plate-shaped material is obtained by smelting, and the surface is polished, cleaned, and dried at 650 ° C. Under 15vt% oxygen (O 2 ): 85vt% nitrogen (N 2 ) atmosphere for 3h, so that the thickness of the surface oxide film is 300μm, to obtain the desired anode, the anode current density is 0.6A / cm 2 , using a C cathode, the distance between the cathode and the anode is 2.5cm, and the electrolysis system is formed in the sodium cryolite system at 900°C. The cell voltage is stable at 3.7-3.9V during the electrolysis process, and the purity of the primary aluminum obtained by electrolysis reaches 99.1%.

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Abstract

The invention relates to a composite alloy inert anode for aluminum electrolysis. The composition of the matrix of the composite alloy inert anode for aluminum electrolysis is (x)A(y)B, wherein X is the content of A in percentage by weight, y is the content of B in percentage by weight, X is 40-100%, and y is 0-60%; A consists of one or multiple elements of Cu, Ni, Fe, Co, Al, Mn, W, Cr, Ti, Sn and Zn; and B consists of one or multiple elements of Mo, Pd, Ag, Cd, Au, Pt, Sb, Mg, Ir, Bi, Pb, Si, N, C and rare-earth. A compact protective film is coated on the matrix, and is an oxide film and or a permeator. The composite alloy inert anode is adopted in the process of electrolysis, thus solving the problems of poor conductivity and thermal shock stability of ceramic anodes; the composite alloy inert anode has better corrosion resistance as compared with a single alloy anode; and in addition, the composite alloy inert anode is especially suitable for being applied in a low-temperature aluminum electrolysis system and can also be applied in the field of fusion-electrolysis metallurgy of rare earth, Mg and the like.

Description

technical field [0001] The invention relates to an anode material for aluminum electrolysis. A composite alloy is used as an inert anode material. The characteristic is that a dense protective film is formed on the surface of the alloy substrate. The composite alloy inert anode is characterized in that it is superior to ceramics in terms of electrical conductivity and thermal shock resistance. Inert anodes are superior to alloy anode materials in terms of corrosion resistance. Applying composite alloy inert anodes to the aluminum electrolysis industry can avoid a large amount of greenhouse gas CO 2 and the discharge of perfluorocarbons, which belong to the field of non-ferrous metal metallurgy molten salt electrolysis technology. Background technique [0002] The traditional Hall-Héroult electrolytic aluminum production process requires the consumption of a large amount of high-quality carbon sources and frequent replacement of anodes, and also emits a large amount of greenh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12C25C3/06
Inventor 卢世刚丁海洋阚素荣张向军李国勋
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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