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High-purity rare earth metal and preparation method and application thereof

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: 2016-08-31
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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  • High-purity rare earth metal and preparation method and application thereof
  • High-purity rare earth metal and preparation method and application thereof
  • High-purity rare earth metal and preparation method and application thereof

Examples

Experimental program
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Effect test

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 tank. The electrolysis voltage is 120V, the current is 800A, and the electrolysis time is 2h. The rare earth metals are reduced to a 900°C molten state. After the electrolysis process is over, the molten rare earth metal is solidified under the cover of chloride salt (such as KCl), and the obtained rare earth metal is Figure 1 (a)-Figure 1 (b) Shown.

[0038] After analysis and testing, its rare earth element content and main impurity element content are shown in Table 1.

[0039] Table 1 The main components of the high-purity rare earth metal prepared in the embodiment 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 embodiment, rare earth oxide fluoride salts (lanthanum oxyfluoride and ceria oxyfluoride) are used as raw materials, and electrolysis is carried out in a graphite electrolytic cell. The electrolysis voltage is 150V, the current is 850A, and the electrolysis time is 3h. The rare earth metal is reduced to a 1000°C molten state. After the electrolysis process is over, the molten rare earth metal is solidified under the cover of fluoride salt (such as LiF).

[0051] After analysis and testing, the content of rare earth elements and main impurity elements are shown in Table 4.

[0052] Table 4 The main components of the high-purity rare earth metal prepared in the embodiment 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 a preparation method and application thereof. Background technique [0002] my country's research on the application of rare earth elements in steel began in the late 1950s. Regarding the research on the application of rare earth elements in steel, certain breakthroughs have been made in theory and practice, and many achievements have been made in the application of rare earth steels. A lot of research and production experience show that rare earth elements have an important influence on the microstructure and mechanical properties of steel and alloys. For example, rare earths have the effects of deep deoxidation and deep desulfurization, rare earths can modify and refine inclusions, and rare earths can inhibit the growth of grains, thereby improving the toughness and plasticity, fatigue performance, wear resistance, corrosi...

Claims

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Application Information

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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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