Inactive anode for aluminium electrolysis
An inert anode and aluminum electrolysis technology, applied in the field of electrodes, can solve the problems of poor corrosion resistance, reduced purity of electrolytic aluminum products, poor electrical conductivity and thermal shock resistance, etc., to reduce surface heat dissipation, shorten preparation cycle, and ensure purity Effect
Inactive Publication Date: 2007-01-17
CENT SOUTH UNIV
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Problems solved by technology
Although metal and alloy materials have excellent electrical conductivity and mechanical properties, they generally have poor corrosion resistance in molten electrolyte salts, which leads to corrosion and dissolution of the electrode itself, which reduces the purity of electrolytic aluminum products; ceramic materials have Good corrosion resistance, but its electrical conductivity and thermal shock resistance are poor, and it is difficult to connect with the metal electrode guide rod of the electrolytic cell; cermet materials combine some advantages of metal and ceramic materials, but the metal phase content is high When the content of the metal phase is low, the corrosion resistance of the material is guaranteed, but the problem of connecting with the metal electrode guide rod needs to be solved
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Embodiment Construction
[0020] 1. A NiFe 2 o 4 -NiO is a corrosion-resistant ceramic phase component, and Cu-Ni-Fe is a small electrode with a metal phase component.
[0021] a>Ingredient:
[0022] Corrosion-resistant ceramic phase composition is NiFe 2 o 4 -NiO, the metal phase composition is Cu-Ni-Fe. The material composition of the cup-shaped outer wall 1 is (NiFe 2 o 4 -NiO)-10(Cu-5Ni) (numbers are mass percentages, the same below). The composition distribution of Gradient Stick 2 is as follows figure 2 shown.
[0023] b>Preparation process
[0024] 1>. Preparation of ceramic powder: Fe 2 o 3 And NiO as raw material, according to the reaction product is NiFe 2 o 4 or NiFe 2 o 4 -5NiO Weigh the raw materials and a certain amount of water, pour them together into a ball mill barrel with a ball-to-material mass ratio of about 8:1, and roll the ball for 2 to 4 hours. Pour out the raw material mixture and grinding balls, dry at 80-100°C to remove water, sieve out the grinding balls, p...
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This invention relates to an inert anode for aluminum electrolysis. It consists of cup ectotheca (1), joint lever (2) between the center position and the metal electrode of electrolysis bath and the cavity between the cup ectotheca (1) and joint lever (2). The working surface of the inert anode and the contact part of the molten salt electrolyte was ceramic of erosion resistance or metal ceramic material to guarantee the purity of electrolytic aluminium and save the carbon source. And there was no gas discharge. The joint lever adopted gradient transition technology to avoid the unexpected change of the material parameters introduced by the substance change and its high-heat stress and the easy dehiscence problem between the metal electrode and the electrode joint part to elongate the service life of the electrode.
Description
technical field [0001] The invention relates to an electrode for electrolytic aluminum production. Background technique [0002] In the current electrolytic aluminum industry, carbon anodes are used as electrolytic electrodes, and carbon is consumed in the process of electrolysis to generate CO and CO 2 , is also accompanied by the generation of harmful gases such as fluorocarbons and carbonitrides, causing environmental pollution. According to statistics, every ton of electrolytic aluminum needs to consume 0.5 to 0.6 tons of high-quality carbon. At the same time, due to the continuous consumption of the carbon anode during the electrolysis process, it is necessary to dynamically adjust the electrode spacing of the electrodes, which is not conducive to the stability of the production process, and also increases the complexity of the control of the electrolytic cell system. In order to solve the above problems, the materials used in the electrolytic aluminum inert anode main...
Claims
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IPC IPC(8): C25C3/12
Inventor 周科朝李志友张雷张晓勇李劼
Owner CENT SOUTH UNIV