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Aluminum electrolysis cell with metal based anode
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An electrolytic cell, metal-based technology, applied in electrolytic components, electrolytic process, electrodes, etc., can solve the problem of short life of metal anodes
Inactive Publication Date: 2011-12-28
ALCAN INT LTD
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Abstract
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Problems solved by technology
Many attempts have been made in the past to use metal anodes in the production of aluminum, but metal anodes have never been used in commercial aluminum production in the aluminum manufacturing industry because the life of the metal anode is too short and needs to be improved.
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Embodiment 1
[0110] This test was carried out with an electrolytic cell according to the invention. The electrolytic cell comprises: an electrolyte containing molten potassium fluoride at a temperature of 900°C, and the composition of the electrolyte is as shown in Table 1, Sample D1. That is, it has abundant dissolved alumina, and the anode is made of nickel-iron alloy, and its composition is shown in sample A2 of Table 2.
[0111] The anode was fabricated as in the comparative example and suspended above the molten electrolyte for 16 hours.
[0112] Electrolysis is carried out in the same electrolyte containing potassium fluoride. The current density is about 0.8A / cm 2 . The cell voltage was stable at 3.8 volts throughout the test. The dissolved alumina content was maintained at around 8% by weight by periodically feeding fresh alumina to the electrolytic cell.
[0113] After 50 hours of electrolysis, the electrolysis was interrupted and the anode was removed. After the anode was c...
Embodiment 2
[0117] Example 1 was repeated with an anode made of the nickel-cobalt-iron alloy composition shown in sample D2 in Table 2, suspended as in Example 1 above an electrolyte containing potassium fluoride having the The composition of sample D1, that is to say, is rich in dissolved alumina. Then, as in Example 1, the anode was tested in the electrolyte and similar results to Example 1 were obtained.
Embodiment 3
[0119] The test of Example 1 was repeated, but with an anode made with the nickel-iron alloy composition of sample H2 in Table 2. As in Example 1, the anode is suspended above an electrolyte containing potassium fluoride, which has the composition of sample D1 in Table 1, that is to say, wherein the dissolved alumina is abundant, and then, as in Example 1, the anode is placed in the electrolyte test in.
[0120] After 50 hours, the electrolysis was interrupted and the anode was removed. After cooling, the exterior and cross section of the anode were observed.
[0121] The external dimensions of the anode are essentially unchanged. The thickness of the oxide exterior of the anode increased from about 70 micrometers to a maximum of 1000 micrometers after use, as in the comparative example. However, no nickel fluoride (NiF 2 ) of the yellow-green passivation layer.
[0122] Immediately below the oxide exterior, worm-eaten structures were observed in the metal interior to a d...
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Abstract
An electrolytic metallurgical tank for electrolyzing aluminum, which includes a metal-based anode (10) containing at least one of nickel, cobalt and iron, such as an anode made of an alloy, the alloy including: 50- 60% by weight nickel and / or cobalt, 25-40% by weight iron, 6-12% by weight copper, 0.5-2% by weight aluminum and / or niobium, a total of 0.5-1.5% by weight of other components. The anode (10) may be coated with a hematite-based coating and an optional cerium oxyfluoride-based outermost coating. The electrolytic cell has a fluoride-containing molten electrolyte (5), the electrolyte temperature Below 940°C, the anode is immersed in the electrolyte, the electrolyte (5) including: 5-14% by weight dissolved alumina; 35-45% by weight aluminum fluoride, 30-45% by weight sodium fluoride, 5-20 % by weight potassium fluoride, 0-5% by weight calcium fluoride, and a total of 0-5% by weight of one or more other components. A nickel-containing anode rod (14b) can be used to suspend the anode (10) in the electrolyte, facing the cathode (21, 21A, 25), which cathode has an aluminum wettable surface (20), especially outwardly Discharge to a horizontal or sloping surface.
Description
field of invention [0001] The present invention relates to aluminum electrolytic metallurgical cells having metal-based anodes containing at least one of nickel, iron and copper which are resistant to passivation and dissolution during use and which do not cause unacceptable damage to the aluminum product. pollute. Background technique [0002] Aluminum has been produced by electrolysis of alumina dissolved in molten cryolite at a temperature of around 950°C for more than a hundred years and carbon anodes and cathodes are still used today. [0003] The use of metal electrodes in commercial aluminum electrolysis cells will be a new technology that will greatly improve the aluminum production process by reducing pollution and reducing the cost of aluminum production. [0004] US Patents 4,614,569 (Duruz / Derivaz / Debely / Adorian), 4,680,094 (Duruz), 4,683,037 (Duruz) and 4,966,674 (Bannochie / Sherriff) describe a non-carbon anode for the electrowinning of aluminum coated with a l...
Claims
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Application Information
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