Electrolytic bath and method for electrolyzing light rare earth metals or alloys

An electrolytic cell and light rare earth technology, which is applied to cells and other directions, can solve the problems of excessive rare earth metal iron content, bolt entry, etc., and achieve the effects of improving quality, avoiding pollution, and the electrolytic cell and method being simple and easy to implement.

Active Publication Date: 2014-01-29
LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bolts fixing the graphite anode sometimes enter the electrolyte solution due to overheating and melting, which will cause the iron content in the output rare earth metal to exceed the standard

Method used

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  • Electrolytic bath and method for electrolyzing light rare earth metals or alloys
  • Electrolytic bath and method for electrolyzing light rare earth metals or alloys
  • Electrolytic bath and method for electrolyzing light rare earth metals or alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] When starting the furnace, first preheat and dry the electrolytic cell and graphite anode, and inject the melted electrolyte into the electrolytic cell, the electrolyte is LaF 3 A molten solution composed of LiF, where LaF 3 The ratio to LiF is 3 / 1. Start the anode lifting device, so that 6 groups of cylindrical graphite anodes are lowered and immersed in the electrolyte solution for 240mm, and the distance between the cathode and anode is controlled to be 50mm. Turn on the power supply, pass in a current of 2000A, keep the electrolyte in a molten state, add lanthanum oxide, and perform electrolysis. Turn on the cooling and temperature control device in the inner wall, so that the surface temperature of the inner wall is 10°C lower than the solidification temperature of the electrolyte solution, so that the electrolyte solution adheres to the surface of the inner wall and gradually solidifies into a stable crust protective layer, and at the same time, add electrolyte t...

Embodiment 2

[0054] When starting the furnace, first preheat and dry the electrolytic cell and graphite anode, and inject the melted electrolyte into the electrolytic cell, the electrolyte is LaF 3 A molten solution composed of LiF, where LaF 3 The ratio to LiF is 8 / 1. Start the anode lifting device, so that 8 groups of square columnar graphite anodes are lowered and immersed in the electrolyte solution for 10mm, and the distance between the cathode and anode is controlled to be 400mm. Turn on the power supply, pass through a current of 5000A, keep the electrolyte in a molten state, add lanthanum oxide, and perform electrolysis. Turn on the cooling and temperature control device in the inner wall, so that the surface temperature of the inner wall is 100°C lower than the solidification temperature of the electrolyte solution, so that the electrolyte solution adheres to the surface of the inner wall and gradually solidifies into a stable crust protective layer, and at the same time, add ele...

Embodiment 3

[0056] When starting the furnace, first preheat and dry the electrolytic cell and graphite anode, and inject the melted electrolyte into the electrolytic cell, the electrolyte is LaF 3 A molten solution composed of LiF, where LaF 3 The ratio to LiF is 6 / 1. Start the anode lifting device, so that 8 groups of cylindrical graphite anodes are lowered and immersed in the electrolyte solution for 120mm, and the distance between the cathode and anode is controlled to be 100mm. Turn on the power supply, feed a current of 4000A to keep the electrolyte in a molten state, add lanthanum oxide, and perform electrolysis. Turn on the cooling and temperature control device in the inner wall, so that the surface temperature of the inner wall is 20°C lower than the solidification temperature of the electrolyte solution, so that the electrolyte solution adheres to the surface of the inner wall and gradually solidifies into a stable crust protection layer, and at the same time, add electrolyte t...

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Abstract

The invention provides an electrolytic bath and a method for electrolyzing light rare earth metals or alloys. The wall of the electrolytic bath is composed of an incrustation protection layer 2 of an electrolyte solution 8 composed of rare earth fluoride-lithium fluoride, a starting cathode 5 is installed at the bottom part of the electrolytic bath, a plurality group of graphite anodes 1 are installed right above the starting cathode, each group of graphite anodes is composed of a graphite anode B to be electrolyzed at the upper side and a graphite anode A being electrolyzed at the lower side, and the graphite anode A is connected with the graphite anode B through threads 15. The contents of ferrum and carbon in the rare earth metals or alloys electrolyzed by the electrolytic bath are low; the generation of waste graphite anodes in the electrolytic process is quite small, even no waste graphite anode is generated. The electrolytic bath and the method for electrolyzing light rare earth metals or alloys provided by the invention are simple and feasible.

Description

technical field [0001] The invention relates to an electrolytic cell and method for electrolyzing light rare earth metals or alloys, which are used for electrolytic production of light rare earth metals or alloys such as neodymium, praseodymium, lanthanum, cerium and alloys thereof, and belong to the technical field of rare earth electrolysis. Background technique [0002] At present, light rare earth metals are mainly prepared from oxides by electrolysis in an electrolyte solution composed of rare earth fluoride-lithium fluoride. [0003] The light rare earth electrolytic cell is mainly an open type of cathode and anode. The chamber of the electrolytic cell is made of graphite material. The cathode and graphite anode are inserted into the molten salt from above the electrolytic cell. The graphite anode is fixed on the anode frame with iron bolts. Since the electrolyte is completely surrounded by graphite material, the carbon content in the electrolyzed rare earth metal is u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C7/00C25C3/34C25C3/36
Inventor 徐建林李红卫李宗安庞思明赵斌王志强陈德宏徐立海
Owner LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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