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A kind of preparation method of low-oxygen high-purity rare earth alloy

A rare earth alloy and high oxygen technology, which is applied in the field of preparation of low oxygen and high purity rare earth alloys, can solve the problems of high performance materials, high oxygen content and high oxygen content in rare earth alloys, and achieves simplified operation, low oxygen content, high oxygen content and high oxygen content. high purity effect

Active Publication Date: 2021-06-25
江西省钨与稀土产品质量监督检验中心(江西省钨与稀土研究院)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing methods still cannot meet the requirements for preparing low-oxygen high-purity rare earth alloys. The various rare earth alloys produced by various methods either have high oxygen content and low purity, or are not properly packaged, transported, stored and used. Strict oxygen control is carried out, and the rare earth alloy finally added to the material has high oxygen content and low purity, which cannot meet the requirements of high-performance material manufacturing

Method used

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  • A kind of preparation method of low-oxygen high-purity rare earth alloy

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Embodiment 1

[0032] A method for preparing a low-oxygen high-purity lanthanum-iron alloy, comprising the following steps:

[0033]1. The newly prepared lanthanum oxide with a purity of 99.98% is used as a raw material, and is added to a fluoride electrolysis system for molten salt electrolysis. The purity of the electrolyte lanthanum fluoride, lithium fluoride, and barium fluoride is all greater than 99.5%, and the cathode of the electrolytic cell is pure iron The anode is a fluted graphite rod, and a pair of graphite heating rods are provided. The temperature of the electrolysis process is controlled at 950°C, the cell voltage is 14V, and the cathode current density is 8A / cm 2 , anode current density 1.5A / cm 2 , the cathode (pure iron rod) is continuously consumed by itself and interdiffused with the precipitated lanthanum metal to form a lanthanum-iron alloy, which is collected at the bottom of the electrolytic cell.

[0034] 2. After 90 minutes of electrolysis, take a carbon steel cas...

Embodiment 2

[0039] A method for preparing a low-oxygen high-purity lanthanum-iron alloy, comprising the following steps:

[0040] 1. Using lanthanum oxide with a purity of 99.95% as the raw material, dehydration at 500°C for 180 minutes for pretreatment, then adding a fluoride electrolysis system for molten salt electrolysis, the purity of the electrolyte lanthanum fluoride and lithium fluoride is greater than 99.5%, The cathode of the electrolytic cell is a pure iron rod, the anode is a fluted graphite rod, and a pair of graphite heating rods are provided. The temperature of the electrolysis process is controlled at 970°C, the cell voltage is 13V, and the cathode current density is 7A / cm 2 , anode current density 1.2A / cm 2 , the cathode (pure iron rod) is continuously consumed by itself and interdiffused with the precipitated lanthanum metal to form a lanthanum-iron alloy, which is collected at the bottom of the electrolytic cell.

[0041] 2. After electrolysis for 100 minutes, take a ...

Embodiment 3

[0046] A method for preparing a low-oxygen high-purity praseodymium-neodymium-iron alloy, comprising the following steps:

[0047] 1. Using the newly prepared mixed chloride of praseodymium and neodymium as raw material, the mass ratio of praseodymium and neodymium is 1:3, adding the chloride electrolysis system for molten salt electrolysis, the purity of praseodymium chloride, neodymium chloride and potassium chloride is all greater than 99.5%. The cathode of the electrolytic cell is a pure iron rod, the anode is a fluted graphite rod, and a pair of graphite heating rods are provided. The temperature of the electrolysis process is controlled at 850°C, the cell voltage is 12V, and the cathode current density is 6A / cm 2 , anode current density 1A / cm 2 , The cathode (pure iron rod) is continuously consumed and interdiffused with the precipitated praseodymium neodymium metal to form a praseodymium neodymium iron alloy, which is collected at the bottom of the electrolytic cell. ...

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Abstract

The invention belongs to the field of rare earth alloy preparation, in particular to a method for preparing a low-oxygen high-purity rare earth alloy. Electrolysis is carried out in a molten salt system with high-purity rare earth oxides or chlorides as raw materials. The anode is graphite, and the cathode is a consumable rod of alloying elements. During the electrolysis process, the cathode is self-consumed and interdiffused with the precipitated rare earth metal to form a rare earth alloy, which is collected at the bottom of the electrolytic tank, and then the casting device of the present invention is used to regularly take out the rare earth alloy from the crucible, and the casting tank is filled with the rare earth alloy melt. Lift the casting tank, quickly close the liquid injection pipe and the pumping / inflating pipe at both ends of the casting tank, and then remove the casting tank, and the low-oxygen high-purity rare earth alloy is produced in the casting tank. The invention has the advantages of simple operation, low oxygen content and high purity of the prepared rare earth alloy, short process flow, high yield and low cost, and can fundamentally solve the difficult problem of preparing low-oxygen high-purity rare earth alloy.

Description

technical field [0001] The invention belongs to the field of rare earth alloy preparation, in particular to a method for preparing a low-oxygen high-purity rare earth alloy. Background technique [0002] Rare earth elements have a series of special properties and are widely used, especially in the fields of high-tech, new material preparation, and new energy. Rare earth elements are indispensable. Adding rare earth elements can significantly improve the strength, heat resistance, wear resistance, and corrosion resistance of materials. and its processing performance. In addition, the addition of rare earth can make the material have special optical, electrical, magnetic, thermal and other properties. [0003] The biggest problem in the application of rare earths in materials is that the rare earth alloys used as additives in the material preparation process have high oxygen content and low purity. In addition, low-oxygen high-purity rare earth alloys are easily re-oxidized a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36C25C7/00
CPCC25C3/36C25C7/005
Inventor 夏侯斌李平刘道斌吴希邓攀邱森刘宜强宋旭东谢敏余音宏蒋小岗朱红英凌细平卢博
Owner 江西省钨与稀土产品质量监督检验中心(江西省钨与稀土研究院)
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