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Process for preparing cell-class mischmetal by fused salt electrolysis process and device therefor

A mixed rare earth and molten salt electrolysis technology, which is applied in the field of rare earth product preparation, can solve the problems of unstable distribution of mixed rare earth metals, pollute the environment, cannot meet the requirements, and achieve long-term stable physical and chemical properties of electrolytes, low impurity content, and improved service life. Effect

Inactive Publication Date: 2006-11-22
BAOTOU XIJUN RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The current production process of misch metal in my country generally adopts the chloride molten salt electrolysis method. The biggest disadvantage of this method is that the distribution of the misch metal produced is very unstable, which cannot meet the requirements of the majority of misch metal users; and in the production process A large amount of HCl, Cl will be produced in 2 and other toxic gases, seriously polluting the environment, the residual Cl element in the product absorbs moisture in the air and corrodes the metal and affects the quality of Ni:H batteries and their applied products

Method used

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  • Process for preparing cell-class mischmetal by fused salt electrolysis process and device therefor

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Embodiment 1

[0025] The present invention is based on rare earth oxide (La 2 o 3 23-33%, CeO 2 47-57%, Pr 6 o 11 3-7%, Nd 2 o 3 12-18%) as raw materials, rare earth fluorides (lanthanum fluoride 48-52%, cerium fluoride 33-37%, praseodymium fluoride 2-4%, neodymium fluoride 9-13%), lithium fluoride binary The system is an electrolyte, the solubility of the oxide in the melt is 2-5%, and the mixed rare earth oxide is electrolyzed by a tungsten cathode to obtain the battery grade mixed rare earth metal.

[0026] Equipment for producing battery-grade mixed rare earth metals by molten salt electrolysis, including casing 1, insulation material 2, inner protective casing 3, cathode 4, silicon carbide combined with silicon nitride material electrolytic cell 5, anode 6, receiver 7, attached to the electrolytic The shape of the anode 6 on the inner surface of the tank 5 is an inverted cone, and the electrolytic tank 5 is made of silicon carbide and silicon nitride materials. After the elec...

Embodiment 2

[0033] The present invention is based on rare earth oxide (La 2 o 3 26-30%, CeO 2 50-54%, Pr 6 o 11 3-7%, Nd 2 o 3 13-17%) as raw materials, rare earth fluoride (lanthanum fluoride 49-51%, cerium fluoride 34-36%, praseodymium fluoride 2-4%, neodymium fluoride 10-11%), lithium fluoride binary The system is an electrolyte, the solubility of the oxide in the melt is 2-5%, and the mixed rare earth oxide is electrolyzed by a tungsten cathode to obtain the battery grade mixed rare earth metal.

[0034] Equipment for producing battery-grade mixed rare earth metals by molten salt electrolysis, including casing 1, insulation material 2, inner protective casing 3, cathode 4, silicon carbide combined with silicon nitride material electrolytic cell 5, anode 6, receiver 7, attached to the electrolytic The shape of the anode 6 on the inner surface of the tank 5 is an inverted cone, and the electrolytic tank 5 is made of silicon carbide and silicon nitride materials. After the electro...

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Abstract

The invention discloses a battery grade composite rare earth metal manufacturing technology and equipment of melting salt electrolytic method in the rare earth product preparing domain, which comprises the following steps: melting the blended rare earth oxide in the fluoride flux; ionizing; evolving Ren+ to reduce into Re on the tungsten cathode surface at (60-70V / M) DC electric field; oxidizing O2- into O2 on the graphite anode surface; reacting O2 and graphite to produce CO2 into the air. The electrolyser is made of carborundum connecting silicon nitride material, which reduces electrolyte fusing point and improves the fluidity and stability.

Description

1. Technical field [0001] The invention relates to a process for producing battery-grade mixed rare earth metals by molten salt electrolysis, and belongs to the field of rare earth product preparation. 2. Background technology [0002] The current production process of misch metal in my country generally adopts the chloride molten salt electrolysis method. The biggest disadvantage of this method is that the distribution of the misch metal produced is very unstable, which cannot meet the requirements of the majority of misch metal users; and in the production process A large amount of HCl, Cl will be produced in 2 And other toxic gases, seriously pollute the environment, the residual Cl element in the product absorbs the moisture in the air and corrodes the metal and affects the quality of Ni:H battery and its application products. [0003] The electrolytic cell uses silicon carbide and silicon nitride materials instead of graphite materials to reduce and eliminate the C cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/36
Inventor 蔺继荣赵良忠韩福军马洪军赵飞张秀艳何伟
Owner BAOTOU XIJUN RARE EARTH
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