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A kind of high-purity rare earth metal and its preparation method and application

A rare earth metal, high-purity technology, applied in the field of high-quality metal material manufacturing, can solve the problems of serious oxidation of rare earth metals and high oxygen content, reduce the generation of large non-metallic inclusions, prevent the increase of impurity elements, and ensure stable and smooth production. row effect

Active Publication Date: 2017-11-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the solidification process of rare earth metals from liquid to solid state, an open pouring and unprotected solidification process is usually adopted, and the whole process is in contact with air, resulting in serious oxidation of rare earth metals and high oxygen content

Method used

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  • A kind of high-purity rare earth metal and its preparation method and application
  • A kind of high-purity rare earth metal and its preparation method and application
  • A kind of high-purity rare earth metal and its preparation method and application

Examples

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Embodiment 1

[0036] Example 1——Preparation of high-purity rare earth

[0037] In this embodiment, rare earth oxides (lanthanum oxide and cerium oxide) are used as raw materials, and electrolysis is carried out in a graphite electrolytic cell with an electrolysis voltage of 120V, a current of 800A, and an electrolysis time of 2 hours, to reduce the rare earth metals to a molten state at 900°C. After the electrolysis process, the molten rare earth metal is solidified under the cover of chloride salt (such as: KCl), and the rare earth metal obtained is as follows: Figure 1(a)-Figure 1(b) shown.

[0038] After analysis and detection, the contents of rare earth elements and main impurity elements are shown in Table 1.

[0039] Table 1 The main components of the high-purity rare earth metals prepared by the embodiments of the present invention (the balance is other impurity elements)

[0040] element

Embodiment 2

[0049] Example 2——Preparation of high-purity rare earth

[0050] In this example, rare earth oxide fluoride salts (lanthanum oxyfluoride and cerium oxyfluoride) were used as raw materials, and electrolysis was carried out in a graphite electrolytic cell with an electrolysis voltage of 150V, a current of 850A, and an electrolysis time of 3 hours to reduce the rare earth metal to a molten state at 1000°C. After the electrolysis process, the molten rare earth metal is solidified under the cover of fluorine salt (such as: LiF).

[0051] After analysis and detection, its rare earth element content and main impurity element content are shown in Table 4.

[0052] Table 4 The main components of the high-purity rare earth metals prepared by the embodiments of the present invention (the balance is other impurity elements)

[0053]

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Abstract

The invention relates to the field of manufacturing of high-quality metal materials, in particular to high-purity rare earth metal and a preparation method and application thereof. The high-purity rare earth metal is characterized in that the total content of rare earth metal is higher than 99.5%, and the oxygen content O is not higher than 0.02% (by weight percentage). The high-purity rare earth metal is obtained by electrolysis of oxide rare earth or rare earth oxide villiaumite and solidified under airtight / protective atmosphere. The main rare earth element of the high-purity rare earth metal is lanthanum and cerium. The high-purity rare earth metal is mainly applied to, but not limited to, the fields of manufacturing of high-quality steel for continuous casting or die casting, high-quality structural steel for equipment manufacturing, special steel, aluminum alloy, magnesium alloy and other metal materials. Additives are provided for equipment manufacturing and high-quality steel materials, molten steel is purified, grains are refined, inclusions are modified, the performance of the steel materials is stably improved, and the negative effects of thick inclusions, water gap blockage, performance deterioration and the like caused by rare earth additives in the steel materials are avoided.

Description

technical field [0001] The invention relates to the field of manufacturing high-quality metal materials, in particular to a high-purity rare earth metal and its preparation method and application. Background technique [0002] my country's research on the application of rare earth elements in steel began in the late 1950s. Research on the application of rare earth elements in steel has made some breakthroughs in theory and practice, and many achievements have been made in the application of rare earth elements in steel. A large number of research and production experience have shown that rare earth elements have an important impact on the structure and mechanical properties of steel and alloys. For example, rare earths have the effect of deep deoxidation and deep desulfurization. Rare earths can modify and refine inclusions. Rare earths can inhibit grain growth, thereby improving the toughness and plasticity, fatigue performance, wear resistance, corrosion resistance and he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/34
CPCC25C3/34
Inventor 李殿中栾义坤杨超云高金柱夏立军刘宏伟傅排先李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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