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Novel method for utilizing hydrogen plasma electric arc melting technology to prepare high-purity rare earth gadolinium elementary substance

A plasma and arc smelting technology, which is applied in the field of high-purification preparation of new rare earth functional materials, can solve the problems of long cycle and low output, and achieve the effects of convenient operation, pollution avoidance and simple process

Inactive Publication Date: 2013-11-27
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to avoid the disadvantages of long period and low output of traditional methods, and how to prepare high-purity oxygen-free gadolinium simple and economical is a key technical problem that needs to be solved

Method used

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  • Novel method for utilizing hydrogen plasma electric arc melting technology to prepare high-purity rare earth gadolinium elementary substance
  • Novel method for utilizing hydrogen plasma electric arc melting technology to prepare high-purity rare earth gadolinium elementary substance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1. Preparation of high-purity Gd elemental substance in high-purity argon (Ar) atmosphere

[0023] (1) Material preparation: Cut the raw material into metal blocks of about 20g on a cutting machine, wash with acetone, and then blow dry.

[0024] (2) Arc smelting: use a laboratory-type plasma arc smelting furnace, place the prepared sample raw materials in a water-cooled copper crucible with a diameter of 25 mm, and vacuumize to 4.6*10 -5 torr, quickly pass high-purity argon. The working current is set to 40A, turned over several times, smelted for 20 minutes, and released after the ingot is completely cooled (about 15 minutes).

[0025] (3) Composition test: The surface and sides of the sample after being released from the furnace were cut off with a cutter under an argon atmosphere, and the core sample was taken for oxygen content analysis. The detection adopts LECO-TCH600 oxygen, nitrogen and hydrogen analyzer, and the analysis results are as follows: figu...

Embodiment 2

[0026] Example 2, Ar+5%H 2 Preparation of high-purity Gd elemental substance in atmosphere

[0027] (1) Material preparation: Cut the raw material into metal blocks of about 20g on a cutting machine, wash with acetone, and then blow dry.

[0028] (2) Arc melting: use a laboratory-type plasma arc melting furnace, place the prepared sample raw materials in a water-cooled copper crucible with a diameter of 25mm, set the working current to 40A, and vacuumize to 4.4*10 -5 torr. Introduce high-purity argon, turn over and melt for 2 minutes in an argon plasma atmosphere, and remove surface impurities; secondly replace the argon atmosphere, pass 5% hydrogen into the chamber, turn over several times, and melt for 20 minutes; finally replace with argon again Atmosphere, turn and smelt for 5 minutes, and release the ingot after it is completely cooled (about 15 minutes).

[0029] Gadolinium metal hydride as GdH 3 , decomposes to generate Gd elemental substance and hydrogen molecules ...

Embodiment 3

[0031] Example 3, Ar+7%H 2 Preparation of high-purity Gd elemental substance in atmosphere

[0032] (1) Material preparation: Cut the raw material into metal blocks of about 20g on a cutting machine, wash with acetone, and then blow dry.

[0033] (2) Arc melting: use a laboratory-type plasma arc melting furnace, place the prepared sample raw materials in a water-cooled copper crucible with a diameter of 25mm, set the working current to 40A, and vacuumize to 4.5*10 -5 torr. Introduce high-purity argon, turn over and melt for 2 minutes in an argon plasma atmosphere, and remove surface impurities; secondly replace the argon atmosphere, pass 7% hydrogen into the chamber, turn over several times, and melt for 20 minutes; finally replace with argon again Atmosphere, turn and smelt for 5 minutes, and release the ingot after it is completely cooled (about 15 minutes).

[0034] (3) Composition test: The surface and sides of the sample after being released from the furnace were cut o...

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Abstract

The invention discloses a novel method for utilizing hydrogen plasma electric arc melting technology to prepare a high-purity rare earth gadolinium elementary substance. The novel method comprises the following steps: firstly, taking high-purity argon gas as a plasma source, smelting a metal sample in a plasma electric arc melting furnace into a regular shape, and removing impurities adhered to the surface of the metal sample; secondly, replacing the argon gas atmosphere, injecting a proper amount of hydrogen into a cavity, generating electric arcs through argon gas and hydrogen both as plasma sources, repeatedly turning over and smelting, and effectively removing oxygen element in elemental gadolinium by utilizing the extremely-strong reducibility of hydrogen atoms at high temperature so as to obtain the high-purity oxygen-free gadolinium finally. The novel method is simple in process, high in preparation speed and remarkable in cleaning effect, can be widely used for preparing high-purity or superhigh-purity rare earth function materials and has a vital application value.

Description

technical field [0001] The invention relates to the high-purification preparation of novel rare earth functional materials, in particular to the preparation of high-purity oxygen-free gadolinium (Gd) simple substance by adding a reducing atmosphere on the basis of arc melting technology. Background technique [0002] Due to the special physical and chemical properties of gadolinium-based rare earth metals, especially their specific optical, electrical, magnetic and catalytic properties, they have now played an important role in energy, information and national defense. Gadolinium is the rare earth element involved in the most fields among all the new rare earth materials researched and developed at present. Gadolinium rare earth materials have been well applied in the fields of magnetostrictive materials, X-ray intensifying screens, and fluorescent materials. It is the first pure metal found to have a large magnetocaloric effect near room temperature, and it is the most wide...

Claims

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Application Information

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IPC IPC(8): C22B59/00
Inventor 李国玲李里李星国田丰
Owner PEKING UNIV
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