A rare earth electrolytic cell up-insertion cathode surfacing welding process

Abstract

The invention discloses a rare-earth electrolytic cell upward-inserting type cathode surfacing technology. The technology comprises the following steps that step 1, a corroded part of a cathode is firstly ground and polished to represent the metal luster of a base material; step 2, the cathode is firstly heated to be close to the melting point of a welding material; step 3, surfacing is carried out on the corroded part of the cathode after the step 2 is completed, in the whole welding process, the base material needs to be heated and welded at the same time, and the welding process cannot be interrupted; step 4, after welding is completed, the cathode is placed in the lime for heat preservation, then the cathode is taken out and cleaned. By carrying out a high-temperature surfacing technology and a lot of experiments, the surfacing technology which is suitable for the rare-earth electrolytic cell upward-inserting type cathode is obtained, the technical problem that cathode surfacing isnot molten is mainly solved, the generation of cracks after surfacing of a tungsten cathode is avoided, the cathode is not in redness when passing through a large current, the normal use requirementsof the rare earth electrolysis are met, recycling of the cathode is realized, and the use cost is reduced.

Description

technical field [0001] The invention relates to the technical field of resurfacing welding of cathodes of electrolytic cells, in particular to a resurfacing process of a plug-in type cathode of a rare earth electrolytic cell. Background technique [0002] With the promotion of fluoride system oxide electrolysis technology in the industry, the plug-in cathode electrolyzer has been greatly developed and applied. The cathode component tungsten, because of its stable chemical properties, high melting point (3422°C), low vapor pressure, high tensile strength, and strong corrosion resistance, is used as an electrolytic cathode and is widely used in fluoride system oxide rare earth electrolytic cells. The fluoride system oxide electrolysis up-plug cathode method has a high temperature at the furnace mouth (1050-1150°C) and a large heat dissipation. During the electrolysis process, a large amount of fluorine-containing gas (HF) will be generated to cause corrosion to the cathode, an...

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Problems solved by technology

[0005] The purpose of the present invention is to: aim at the above-mentioned problems, to provide a kind of surfacing welding process for the upper plug-in cathode of the rare earth electrolytic cell. The surfacing welding process of the type cathode resurfacing welding mainly overcomes the technical problem of non-melting cathode surfacing welding, solves the technical problem of poor welding effect of the traditional surfacing welding method, and avoids the occurrence of cracks after tungsten cathode surfacing welding, making the cathode No redness when passing a large current, which meets the normal use requirements of rare earth electrolysis, realizes the recycling of cathodes, and reduces the cost of use

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