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Electrolysis device and electrolysis method

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

Active Publication Date: 2018-10-19
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

[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

[0068] 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, and the flow rate of gas in the ventilation pipe is controlled to 4.0×10 -5 m 3 / s, the angle between the direction of the gas outlet and the normal direction of the inner wall of the electrolytic cell is 30°, 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.

[0069] Main technical indicators: current efficiency is 88.0%, carbon content is 200ppm, iron content is 500ppm, and the service l...

Embodiment 2

[0071] 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, electrolysis voltage is 8.5V, and the flow rate of gas in the ventilation pipe is controlled to 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.

[0072] Main technical indicators: current efficiency is 90.0%, carbon content is 190ppm, iron content is 450ppm, and the service life of a single anode is 96-104h.

Embodiment 3

[0074] to DyF 3 and LiF mixture as a molten salt electrolyte, where DyF 3 The mass ratio to LiF is 6:1, with graphite as the anode and iron rod as the cathode, electrolyze at 1080°C, the electrolysis voltage is 10.0V, and the flow rate of the gas in the ventilation pipe is controlled to 5.0×10 -5 m 3 / s, the angle between the direction of the gas outlet and the normal direction of the inner wall of the electrolytic cell is 45°, 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.

[0075] Main technical indicators: current efficiency 87%, carbon co...

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Abstract

The invention provides an electrolysis device and method. The electrolysis device comprises an electrolysis tank, at least one cathode in the electrolysis tank, multiple anodes arranged around the cathode in intervals and multiple air blowing pipes symmetrically arranged on the inner wall of the electrolysis tank, wherein bottom outlets of the air blowing pipes stretch out of the bottom surface of the electrolysis tank and are arranged along a horizontal direction. An electrolyte at the bottom of the electrolysis tank is stirred through gas and a gas outlet direction and a cathode center direction form an a certain angle in air blowing so that the electrolyte on the bottom produces eddy currents along a horizontal direction and the electrolyte in all zones in the electrolysis tank can circularly flow and thus heat transfer and mass transfer in the electrolysis tank are improved, inner temperatures and components are uniformed, product quality is improved and furnace conditions are improved.

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): C25C7/06C25C3/34
Inventor 李宗安刘钊吴道高王志强陈德宏周林张小伟苗睿瑛张虎颜世宏
Owner LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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