Method of preparing high rare-earth content magnesium intermediate alloy

A technology of high rare earth content and master alloy, which is applied in the field of preparation of rare earth magnesium master alloy, which can solve the problems of low current efficiency, rare earth metal yield, low product purity, uneven rare earth content, and complex structure of the electrolytic cell, so as to improve the metal yield And current efficiency and product quality, high rare earth content, suitable for large-scale production

Active Publication Date: 2007-10-24
LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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  • Application Information

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Problems solved by technology

Its disadvantages are: due to the large difference in specific gravity between rare earth and magnesium, it is easy to cause rare earth metals to sink to the bottom, difficult to dissolve and diffuse, resulting in uneven rare earth content, and prone to peritectic reaction, resulting in inclusions; in addition, rare earth metals Except for La, Ce, Pr and Nd, the preparation process of other medium and heavy rare earth metals is complicated and the manufacturing cost is high
The electrolytic cell structure of this process is complex, and the current efficiency, rare earth metal yield and product purity are all low

Method used

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  • Method of preparing high rare-earth content magnesium intermediate alloy

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example 1

[0018] 1. Electrolyte ratio YF 3 : LiF=90:10, the mixture feeding ratio is Y 2 o 3 :MgO=84:16, electrolysis temperature 1000~1020℃: current intensity is 2200A, cathode current density is 20A / cm 2 , the electrolysis time is 1 hour, and the amount of the mixture added is 2kg. 1.43 kg of alloy was obtained, the content of yttrium in the alloy was 84.6%, and the current efficiency was 71.7%. The alloy composition analysis results are shown in the table below:

[0019] Y

Embodiment 2

[0021] Electrolyte ratio NdF 3 :MgF 2 : LiF=85%: 5%: 10%, the mixture feeding ratio is Nd 2 o 3 :MgO=80:20, electrolysis temperature 920~950℃: current intensity is 1500A, cathode current density is 12A / cm 2 , the electrolysis time is 1 hour, and the amount of the mixture added is 2.1kg. 1.56kg of alloy was obtained, the Nd content in the alloy was 90.6%, and the current efficiency was 74%. The alloy element analysis is shown in the table below.

[0022] Nb

Embodiment 3

[0024] Electrolyte ratio GdF 3 : LiF=90:10, the mixture feeding ratio is Gd 2 o 3 :MgO=80:20, electrolysis temperature 1000~1020℃: current intensity is 2200A, cathode current density is 20A / cm 2 , The continuous electrolysis time is 48 hours, and the amount of the mixture added is 159.5kg. 114.23 kg of alloy was obtained, the total amount of gadolinium contained in the alloy was 103.26 kg, the current efficiency was 72.9%, and the yield of metal gadolinium was 93.3%. The alloy element analysis is shown in the table below.

[0025] Gd

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Abstract

The invention discloses a making method of intermediate alloy of high rare earth magnesium, which is characterized by the following: adding RE-O and MgO in the REF3-LiF or REF3-MgF2-LiF fusing salt system; electrolyzing; proceeding eutectoid; making the product with high receiving rate.

Description

technical field [0001] The invention relates to a method for preparing a rare-earth-magnesium master alloy by electrolytic eutectoid of rare-earth oxide and magnesium oxide. Background technique [0002] Rare earth plays an important role in improving the heat resistance, casting, welding and mechanical properties of magnesium alloys. The developed magnesium alloys containing rare earths such as MB25 (Mg-Zn-Zr-Y system), MB15 (Mg-Zn-Zr-Nd system) , ZM5 (Mg-cerium-rich system), etc. have been widely used in various fields of aviation, aerospace and automobiles. [0003] The traditional smelting method of rare earth magnesium alloy is the method of doping, that is, the rare earth metal is directly added to the magnesium liquid to prepare magnesium alloy. Its disadvantages are: due to the large difference in specific gravity between rare earth and magnesium, it is easy to cause rare earth metals to sink to the bottom, difficult to dissolve and diffuse, resulting in uneven rare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/36
Inventor 李宗安李红卫颜世宏庞思明赵斌王志强陈博雨栾文洲周林贺圣李振海
Owner LESHAN YOUYAN RARE EARTH NEW MATERIAL CO LTD
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