Rare earth coating for preventing high-temperature oxidation corrosion of electrolytic anode and preparation method

Abstract

The invention relates to a rare earth coating for preventing high-temperature oxidation corrosion of an electrolytic anode and a preparation method. The rare earth coating for preventing high-temperature oxidation corrosion of the electrolytic anode comprises the following raw materials in parts by weight: 20-60 parts of a binder, 25-50 parts of a modified high-temperature filler, 5-15 parts of ahigh-temperature self-healing filler, 0.5-10 parts of a functional rare earth filler and 0.5-5 parts of an inorganic suspending agent. The preparation method comprises the following steps of: mixing all the raw materials, homogenizing for 1-3 hours under a high-speed stirring condition, and grinding until D50 is less than or equal to 2 mum. According to the rare earth coating for preventing high-temperature oxidation corrosion of the electrolytic anode, emission of carbon dioxide and fluorocarbon can be reduced, rare earth elements are introduced into the coating, and the quality of electrolytic metal can be improved while the performance of the coating is improved.

Description

technical field [0001] The invention belongs to the field of metal electrolysis, and in particular relates to a rare earth coating for preventing high-temperature oxidation and corrosion of an electrolytic anode and a preparation method thereof. Background technique [0002] At present, metal and rare earth electrolytic anodes are mainly made of graphite, carbon and other materials. During use, the anode is suspended on the upper part of the high-temperature electrolytic cell, and a large amount of high-temperature corrosive gases are released during the electrolysis process, such as CO, CO 2 , HF, CF 2 and CF 4 etc. These high-temperature gases will react with the hot anode surface, resulting in the useless consumption of anode rods and blocks. At the same time, severe corrosion will cause the anode to fall off in a honeycomb shape, which not only reduces the electrical efficiency of the anode, but also reduces the quality of the molten metal. [0003] The authorized ann...

AI Technical Summary

Problems solved by technology

[0002] At present, metal and rare earth electrolytic anodes are mainly made of graphite, carbon and other materials. During use, the anode is suspended on the upper part of the high-temperature electrolytic cell, and a large amount of high-temperature corrosive gases are released during the electrolysis process, such as CO, CO 2 , HF, CF 2 and CF 4 etc. These high-temperature gases will react with the hot anode surface, resulting in the useless consumption of anode rods and blocks

At the same time, severe corrosion will cause the anode to fall off in a honeycomb shape, which not only reduces the electrical efficiency of the anode, but also reduces the quality of the molten metal

[0003] Authorized announcement number is CN107057412B "A self-curing electrolytic aluminum carbon anode high-temperature anti-oxidation coating" patent, in which organic additives and resins are used in the middle, which are easy to lose their effect at high temperatures

Publication No. CN102424730A "Anti-oxidation Coating for Electrolytic Aluminum Anode Carbon Block and Its Preparation Method" Patent, "An Anti-oxidation Coating for Electrolytic Aluminum Carbon Anode" disclosed by Shenyang Foundry Research Institute, Publication No. CN102424730A "An Antioxidant Coating for Electrolytic Aluminum Anodes" Aluminum prebaked anode anti-oxidation coating and its preparation method" patent and publication number CN108315765A "A kind of aluminum electrolytic anode anti-oxidation coating prepared by using aluminum ash slag", mostly use phosphate or boric acid (salt) and organic film-forming agent, etc. As a binder, it is made of high-temperature-resistant filler alumina or high-temperature ceramic filler. The technical solutions are all film-forming with the help of organic components, or the mineral raw materials used introduce more impurities.

However, the organic components will quickly lose their effect at high temperature, and the mineral components are easy to introduce impurity metal elements, which is not good for the quality of metal products.