A kind of arc starting method of rare earth electrolyzer
An electrolytic cell and rare earth technology, applied in the direction of electrolysis components and electrolysis processes, can solve the problems of large amount of electrolyte, difficult arc start, electrolyte leakage, etc., to improve the cathode-anode distance, meet the construction needs, and prevent oxidation corrosion. Effect
Inactive Publication Date: 2021-04-23
CENT SOUTH UNIV
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Problems solved by technology
For example, the large-scale rare earth electrolyzers proposed in the published patents CN201711474369, CN201510783550 and CN201610180407 have large electrolyzers, more heat dissipation, and a large amount of electrolyte used in production. It is difficult to start the arc with the existing method
At the same time, the tank body is an anode inserted upwards, and the cathode is set at the bottom of the tank, and the high temperature during arcing is easy to cause damage to the cathode
In addition, the lining of a large rare earth electrolyzer is not a whole, and the problem of arc start and electrolyte leakage during normal operation needs to be considered
Method used
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Embodiment 1
[0057] The applicant conducted an arcing start-up test on a 20kA-level large-scale intelligent rare earth electrolytic cell developed by itself. The structure of the electrolytic cell is shown in the Chinese patent specification CN201711474369.6. t. The specific implementation process is as follows:
[0058] The first step is to install the furnace: first, lay a layer of refractory electrolyte blocks with a width of about 50mm (taken from the refractory slag produced in the electrolytic production of rare earths) on the side corners of the electrolytic cell, and then spread a layer on the corners of the end face 100mm wide refractory electrolyte block, and then continue to lay rare earth oxides on top of the refractory electrolyte, of which praseodymium oxide accounts for about 20% and neodymium oxide accounts for about 80%, (see figure 1 ), the laying height of the rare earth oxide is 100mm, and the electrolyte with a mass ratio of rare earth fluoride (neodymium fluoride) an...
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Abstract
The invention relates to an arcing starting method of a rare earth electrolytic cell, wherein a first electrolyte layer is filled at the corner between the bottom liner and the side liner in the cell body; then a rare earth oxide layer is filled on the first electrolyte layer; and then , fill the inner space of the first electrolyte layer and / or the rare earth oxide layer with the second electrolyte; provide several arc strikers, set several graphite blocks in contact with the anode in the tank; electrically connect one pole of the arc striker to the anode , connect the other pole of the arcing machine with the graphite block through the arcing rod, energize, and perform the first arcing. When the second electrolyte in contact with the cathode is in liquid state, stop the arcing and put the several arcings The one electrode connected to the anode is electrically connected to the cathode, energized, and the arc is struck for the second time. When the temperature of the molten electrolyte in the tank reaches the electrolysis temperature requirement, the arc is stopped; direct current is passed through the anode and the cathode to perform electrolysis. The arc striking starting method of the invention can realize safe and stable starting of a large rare earth electrolyzer.
Description
technical field [0001] The invention relates to an arc starting method for a rare earth electrolytic cell, in particular to an arc starting method for a large rare earth electrolytic cell, and belongs to the field of rare earth electrolysis. Background technique [0002] At present, the electrolytic production process of industrial rare earths has disadvantages such as small cell size, low output, high energy consumption, high labor intensity, and serious pollution. The installation of upper automation equipment limits the collection and treatment of fluoride fumes. Therefore, it is the research direction in the field of rare earth electrolysis to subvert the traditional mode of inserting cathode and anode on the rare earth electrolytic cell, to find a new electrode structure, and to enlarge the rare earth electrolytic cell. In October 2017, the Ministry of Industry and Information Technology issued the "Guidelines for Research and Development of Key Industrial Technology",...
Claims
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IPC IPC(8): C25C7/06C25C3/34
CPCC25C3/34C25C7/06
Inventor 吕晓军韩泽勋韦茗仁王维维官朝红陈昌
Owner CENT SOUTH UNIV