A method for producing rare earth metals and alloys

A technology of rare earth metals and alloys, applied in the direction of electrolytic components, electrolytic processes, etc., can solve the problems of not listing the amount of various materials added, not considering the sudden change of the local ratio and quantity of materials, and not mixing treatment, etc., so as to reduce non- Rare earth impurity content, the effect of increasing unit yield and increasing production capacity

Active Publication Date: 2020-05-08
QIANDONG RARE EARTH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, although the supplementary electrolyte (that is, rare earth fluoride-lithium fluoride) and rare earth oxide are added at the same time, from the content of the entire patent document, the electrolyte (that is, rare earth fluoride-lithium fluoride) and rare earth oxide The materials are added separately without mixing in advance, and the amount of various materials added is not listed, so this method only adds materials simply and crudely, without considering the impact on the entire electrolytic system when the materials are added separately at the same time. Sudden changes in the local ratio and quantity of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] LiF and LaF melted into the electrolytic cell 3 Add uniform La to the mixed electrolyte2 o 3 、LaF 3 Mix raw materials with LiF, the mixing ratio is La 2 o 3 :LaF 3 :LiF=100:8:2, during the electrolysis process, depending on the situation in the electrolytic tank, stir with tungsten rods from time to time, so that the raw materials can be fully diffused and dissolved in the molten molten salt, and the metal lanthanum product can be obtained by natural cooling after being released from the furnace. During the production of a single furnace, the C content (C<300ppm) in metal lanthanum accounts for 90.3%, the monthly output of a single furnace is 4902.3 kg, the current efficiency is 80.6%, and the ratio of fluoride and lithium fluoride is stable during the electrolysis process.

Embodiment 2

[0024] Add PrNdO, PrNdF and LiF mixed raw materials into the electrolytic tank filled with molten electrolyte every 4 minutes through an automatic feeder, the mixing mass ratio is PrNdO:PrNd:LiF=100:7:0.6, and a molybdenum crucible is used as a collecting crucible. During the electrolysis process, the molybdenum bar is used to stir for 30s every 6 minutes, so that the raw materials are fully diffused and dissolved in the molten molten salt, and the metal praseodymium and neodymium products are obtained by natural cooling after being released from the furnace. During the production of a single furnace, the C content of metal praseodymium and neodymium (C<300ppm) accounts for 95.4%, and the Mo content (<500ppm) accounts for 90.8%. Stablize.

Embodiment 3

[0026] LiF and DyF manually melted into the electrolytic cell 3 The electrolyte was added to the mixed Dy 2 o 3 、DyF 3 mixture and LiF, the mixture is Dy in weight ratio 2 o 3 :DyF 3 =100:10, the feeding weight of LiF is LiF:(Dy 2 o 3 +DyF 3 ) = 0.5:100 for calculation. During the electrolysis process, depending on the situation in the electrolytic tank, the pure iron rod is used to stir irregularly, so that the raw materials are fully diffused and dissolved in the molten molten salt, and the DyFe alloy is obtained by natural cooling after being released from the furnace. During the production period of a single furnace, the C content (C<300ppm) of DyFe alloy accounts for 98.7%, the monthly output of a single furnace is 5120.7kg, the current efficiency is 78.8%, and the ratio of fluoride and lithium fluoride in the electrolyte is stable during the electrolysis process.

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Abstract

The invention relates to a rare-earth metal production method or a rare-earth alloy production method. The production method includes adding a mixture of REO, REF and LiF, or one of electrolysis raw materials, namely REO, REF and LiF and a mixture of the other two electrolysis raw materials into an electrolytic bath with molten REF and LiF mixture electrolyte, and electrolyzing so as to obtain rare-earth metal or rare-earth alloy. The production method has the advantages that during operation of the electrolytic bath, fluctuation of a molten salt electrolysis system due to addition of single oxides is avoided, the electrolyte system can be kept uniform and stable, a density difference between electrolyzed metal and the system is stable, the metal or alloy can be better separated from and integrated with the system, non-rare-earth impurities are reduced and the product quality is improved; the monthly output is increased, current efficiency is improved and production cost is reduced.

Description

technical field [0001] The invention relates to a method for producing rare earth metals and alloys, and belongs to the technical field of rare earth production technology. Background technique [0002] Molten salt electrolysis is one of the main methods for producing rare earth metals and alloys, which can be divided into chloride molten salt electrolysis and fluoride molten salt electrolysis. The disadvantages of chloride molten salt electrolysis, such as difficulty in preparing anhydrous chloride, low current efficiency, and high pressure on environmental protection, limit its development. At present, rare earth molten salt electrolysis is mainly based on fluoride molten salt electrolysis system, and the electrolyte is mainly composed of REF and LiF. [0003] In the existing rare earth electrolysis process, the mainstream cell type is 4-6kA, and the electric efficiency is 70%-75%. After the electric efficiency reaches 80%, it is difficult to improve the process index (t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/34C25C3/36C25C7/00C25C7/06
CPCC25C3/34C25C3/36C25C7/00C25C7/06
Inventor 龚斌章立志郭雪锋江南陈炎鑫李孝璋
Owner QIANDONG RARE EARTH GRP
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