Electrolysis device and electrolysis method

An electrolysis device and electrolysis method technology, applied in the field of electrolysis, can solve problems such as the flow dead zone of the electrolytic cell, and achieve the effects of enhancing heat transfer and mass transfer, uniform temperature and composition, and slowing down nodules

Active Publication Date: 2018-11-06
LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The main purpose of the present invention is to provide an electrolysis device and an electrolysis method to solve the problem of dead flow at the bottom of the electrolytic cell in the prior art

Method used

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  • Electrolysis device and electrolysis method
  • Electrolysis device and electrolysis method
  • Electrolysis device and electrolysis method

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Take NdF 3 and LiF mixture as a molten salt electrolyte, where NdF 3 The mass ratio to LiF is 7:1, graphite is used as anode, molybdenum rod is used as cathode, electrolysis is performed at 1050°C, the electrolysis voltage is 8.5V, air is introduced into the gas-liquid flow pipe every 0.5min, and the flow of gas is controlled 4.0×10 -5 m 3 / s, under the action of direct current, the added Nd 2 o 3 Nd in 3+ precipitated on the surface of the cathode. The metal droplets are formed and fall into the molybdenum crucible at the bottom of the electrolytic cell. After 2 hours of electrolysis, the metal droplets are scooped out and poured into the mold. No nodules were found at the bottom of the side wall of the furnace after working for 72 hours.

[0064] Main technical indicators: current efficiency is 88.0%, carbon content is 200 ppm, iron content is 500 ppm, and the service life of a single anode is 80~88h.

Embodiment 2

[0066] Take NdF 3 and LiF mixture as a molten salt electrolyte, where NdF 3 The mass ratio to LiF is 7:1, graphite is used as anode, molybdenum rod is used as cathode, electrolysis is performed at 1050°C, the electrolysis voltage is 8.5V, air is introduced into the gas-liquid flow pipeline every 30min, and the gas-liquid flow pipeline The gas flow control is 7.0×10 -5 m 3 / s, under the action of direct current, the added Nd 2 o 3 Nd in 3+ precipitated on the surface of the cathode. The metal droplets are formed and fall into the molybdenum crucible at the bottom of the electrolytic cell. After 2 hours of electrolysis, the metal droplets are scooped out and poured into the mold. The bottom of the side wall of the furnace body has not been found to have nodulation phenomenon after working for 100 hours.

[0067] Main technical indicators: current efficiency is 90.0%, carbon content is 190 ppm, iron content is 450 ppm, and the service life of a single anode is 96~104h.

Embodiment 3

[0075] to DyF 3 and LiF mixture as a molten salt electrolyte, where DyF 3 The mass ratio to LiF is 6:1, graphite is used as anode, iron rod is used as cathode, electrolysis is performed at 1080°C, the electrolysis voltage is 10.0V, air is introduced into the gas-liquid flow pipe every 10min, and the gas-liquid flow pipe The gas flow control is 5.0×10 -5 m 3 / s, under the action of direct current, the added Dy 2 o 3 Dy in 3+ It precipitates on the surface of the cathode and interacts with the iron cathode to form DyFe alloy droplets, which fall into the iron crucible at the bottom of the electrolytic cell. After 2 hours of electrolysis, the iron crucible is lifted out, and the alloy droplets obtained by electrolysis are poured into the mold. There was no nodulation at the bottom of the side wall of the furnace after working for 80 hours.

[0076] Main technical indicators: the current efficiency is 87%, the carbon content in the DyFe alloy is 180ppm, the mass percentage ...

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Abstract

The invention provides an electrolysis device and an electrolysis method. The electrolysis device comprises an electrolytic cell, at least one cathode, a plurality of anodes and a plurality of gas-liquid flowing pipelines, wherein the electrolytic cell comprises a cell body and a cell cavity defined by the cell body; at least one cathode is arranged inside the electrolytic cell; the anodes are arranged at the periphery of the cathode at intervals; the gas-liquid flowing pipelines are arranged inside the cell body; and an inner outlet of each pipeline communicates with the cell cavity. According to the electrolysis device provided by the invention, the gas-liquid flowing pipelines are arranged inside the cell body of the electrolytic cell, and gas flow is intermittently introduced to the upper ends of the pipelines to cause electrolyte inside the pipelines and the cell body to generate pressure difference, so that electrolyte in the pipelines enters and exits in a circulating mode, the electrolyte on the bottom area of the electrolytic cell can flow in the circulating mode, heat transfer and mass transfer inside the electrolytic cell are strengthened, temperature and components inside the electrolytic cell are uniform, dross on the bottom of the electrolytic cell is relieved better, and therefore, the problem that the bottom of the electrolytic cell in the prior art has a flowing dead zone in the prior art is solved.

Description

technical field [0001] The invention relates to the field of electrolysis, in particular to an electrolysis device and an electrolysis method. Background technique [0002] The cathode and anode of the existing rare earth metal electrolytic cells are generally arranged in vertical parallel suspension, the electrolysis reaction mainly occurs between the cathode and anode, and the CO, CO produced by the anode 2 The gas escapes upwards and pushes the electrolyte to form a vortex between the cathode and anode, thereby maintaining the heat and mass transfer process of normal electrolysis. However, there is still a distance between the bottom of the cathode and anode and the bottom of the tank, and because the horizontal direction of the bottom of the cathode and anode is basically the edge of eddy current movement, the fluidity of the electrolyte in the area below it is very poor, so it is not dissolved and has time to participate in the electrochemical reaction. The rare earth ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C7/00C25C3/34C25C3/36
Inventor 吴道高陈德宏王志强周林张小伟张虎杨宏博苗睿瑛刘钊颜世宏李宗安
Owner LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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