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Method for storing target comprising rare earth metal or oxide thereof

A technology of rare earth metals and preservation methods, which can be applied to the coating process of metal materials, transportation and packaging, containers to prevent decay, etc., and can solve problems such as insufficient preservation methods

Active Publication Date: 2011-09-28
JX NIPPON MINING & METALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since these methods seal the target with a resin cap or a resinous film, they are not sufficient as a preservation method for a target containing a rare earth metal or an oxide thereof.

Method used

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  • Method for storing target comprising rare earth metal or oxide thereof
  • Method for storing target comprising rare earth metal or oxide thereof
  • Method for storing target comprising rare earth metal or oxide thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] An example of a case where the La target is vacuum-packed and the surface and sides are thinly filled with La oxide powder. The specific example figure 1 shown.

[0065] Such as figure 1 As shown, through the existence of a lanthanum oxide layer between the film of the vacuum packaging bag and the La target, the moisture remaining inside the vacuum packaging bag and the moisture entering through the film are absorbed by the lanthanum oxide powder and fixed in the form of lanthanum hydroxide , Therefore, it can effectively prevent the La target surface from reacting with moisture to produce hydroxide and pulverization.

Embodiment 2

[0067] An example where the La target is vacuum-packed and the La oxide powder is placed (like a silica gel bag) in a space with a height difference from BP. The specific example figure 2 shown.

[0068] Such as figure 2 As shown, in the vacuum packaging bag, the remaining moisture in the trace residual space is absorbed by La oxide and fixed in the form of lanthanum hydroxide, so it can effectively prevent the La target from reacting with moisture to produce hydroxide and pulverization The phenomenon.

Embodiment 3

[0070] An example in which a La oxide target is installed in a metal container, La oxide powder is filled around the target, and the ambient air is first replaced with argon gas having a dew point of -80°C or lower, and then vacuum-sealed. The specific example image 3 shown.

[0071] Such as image 3 As shown, the remaining moisture after vacuuming is absorbed by lanthanum oxide and fixed in the form of lanthanum hydroxide. Therefore, it can effectively prevent La from reacting with moisture to produce hydroxide and pulverization.

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Abstract

Disclosed is a method for storing a target comprising a rare earth metal or an oxide thereof. The method is characterized in that an oxide of the same rare earth metal as one contained in the target to be stored is introduced, as a desiccant, into a storage container or a film-like sealing material for storing the target therein, the storage container or the film-like sealing material is sealed, and the sealed storage container or the sealed film-like sealing material is stored. It becomes possible to provide a technique which enables the storage of a target comprising a rare earth metal or an oxide thereof for a long period by devising a method for storing the target so as to prevent the oxidation of the target upon the penetration of air or the dusting of the target caused by the hydroxylation of the target.

Description

technical field [0001] The present invention relates to a method for preserving targets comprising rare earth metals or their oxides which are easily pulverized by oxidation or hydroxide. Background technique [0002] Rare earth metals are contained in the earth's crust as mixed complex oxides. Rare earth elements are separated from relatively rare (rare) minerals, which is why they are named so, but they are by no means rare when viewed from the perspective of the earth's crust as a whole. Recently, rare earth metals have been attracting attention as electronic materials, and research and development are ongoing. [0003] Among these rare earth metals, lanthanum (La) has attracted attention in particular. Briefly explaining this lanthanum, lanthanum is a white metal with an atomic number of 57 and an atomic weight of 138.9, and has a double hexagonal closest-packed structure at room temperature. The melting point is 921°C, the boiling point is 3500°C, and the density is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/34B65D81/26C23F15/00
CPCC23C14/3407C23F15/00C23C14/34B65D81/26
Inventor 佐藤和幸小井土由将
Owner JX NIPPON MINING & METALS CORP