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Rare earth alloy, preparation technique and application thereof

A technology of rare earth alloys and light rare earths, which is applied in the field of oxide electrolysis preparation technology, can solve the problems of large fluctuations in process current efficiency, high energy consumption, and high cost, and achieve the effects of decreasing viscosity, improving electrical efficiency, and improving conductivity

Active Publication Date: 2008-08-13
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

However, the current efficiency of the process described in the patent fluctuates greatly, the minimum current efficiency is 20%, the maximum current efficiency is <75%, and the metal yield is <90%, which brings high energy consumption and high cost to industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] Electrolyte ratio NdF 3 :DyF 3 :LiF:MgF 2 =55:35:8:2, the mixture feeding ratio is Nd 2 o 3 : Dy 2 o 3 =62:38, the electrolysis temperature is 1000-1020°C, the current intensity is 2200A, and the cathode current density is 10A / cm 2 , anode current density 0.8A / cm 2, the electrolysis time was 1 hour, and the amount of the mixture added was 4.3kg. 3.4kg of alloy was obtained, the dysprosium content in the alloy was 40wt%, the current efficiency was 81%, and the yield was 93%. The alloy composition analysis results are shown in the table below:

[0032] Table 1 Example 1 alloy composition analysis results wt%

[0033] Nd

example 2

[0035] Electrolyte ratio NdF 3 :DyF 3 :LiF:MgF 2 = 62:32:5:1, the mixture feeding ratio is Nd 2 o 3 : Dy 2 o 3 =68:32, the electrolysis temperature is 1000~1020°C, the current intensity is 2200A, the cathode current density is 15A / cm2, and the anode current density is 0.9A / cm2 2 , the electrolysis time is 1 hour, and the amount of the mixture added is 4kg. 3.2kg of alloy was obtained, the content of Dy in the alloy was 35wt%, the current efficiency was 76%, and the yield was 93%. The alloy composition analysis results are shown in the table below:

[0036] Table 2 Example 2 alloy composition analysis results wt%

[0037] Nd

example 3

[0039] Electrolyte ratio NdF 3 :DyF 3 :LiF:MgF 2 =70:20:9.5:0.5, the mixture feeding ratio is Nd 2 o 3 : Dy 2 o 3 =83:17, the electrolysis temperature is 1000~1020°C, the current intensity is 2200A, and the cathode current density is 10A / cm 2 , anode current density 1.0A / cm 2 , the electrolysis time was 1 hour, and the amount of the mixture added was 4.2kg. 3.3kg of the alloy was obtained, the dysprosium content in the alloy was 19wt%, the current efficiency was 81%, and the yield was 93%. The alloy composition analysis results are shown in the table below:

[0040] Table 3 Example 3 alloy composition analysis results wt%

[0041] Nd

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Abstract

The invention relates to a light rare earth base heavy rare earth alloy, a preparation technology and application thereof. The alloy contains 1-40wt% heavy rare earth, and is prepared by oxide fused salt electrolysis process in fluoride molten salt. The electrolyte is composed of rare earth fluoride, lithium fluoride and magnesium fluoride, the compositions are: 65 to 87wt% of base fluoride in rare earth fluoride, 5 to 25wt% of heavy rear earth fluoride, 5-12wt% of lithium fluoride and 0.5 to 3wt% of magnesium fluoride. Since the electric efficiency is larger than 75%, the metal recovery rate is large than 90%, the preparation technology is especially suitable for industrialized mass production.

Description

Technical field: [0001] The invention relates to a light rare earth-based heavy rare earth alloy and an oxide electrolysis preparation process in a fluorine salt system and its application. It belongs to the field of rare earth metallurgy. technical background: [0002] The unique electronic structure of rare earth elements makes them have excellent magnetic, optical and electrical properties, and is widely used in the preparation of functional materials. For example, a large amount of metal praseodymium, neodymium, dysprosium, terbium, etc. With the rapid growth of demand for rare earth functional materials such as magnetic materials, the price of rare earth metals has risen sharply, and magnet manufacturers are facing huge cost pressures. In order to reduce costs, NdFeB enterprises and metal production enterprises are constantly looking for new formulas and new production methods. For example, in recent years, praseodymium neodymium alloys and dysprosium iron alloys with ...

Claims

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Application Information

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IPC IPC(8): C22C28/00C22C30/00C25C3/34H01F1/053
Inventor 李宗安王志强颜世宏于敦波李红卫李振海赵春雷鱼志坚胡权霞
Owner LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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