Arc Plasma Purification of Gadolinium and GONP Synthesis
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Solution Overview
Problem
Current purification methods for rare earth metals, such as vacuum distillation and electrolytic refining, face limitations including long operation times, low efficiency, difficulty in removing gas impurities, high contamination risks, and poor environmental conditions, which hinder the production of high-purity gadolinium and gadolinium oxide nanoparticles (GONPs).
Innovation Solution
An integrated method using arc plasma technology for metallurgical purification of metallic gadolinium and preparation of GONPs, involving specific discharge current and time settings in an arc furnace with argon and air atmospheres, effectively removing impurities and producing high-purity, small-sized, and dispersible GONPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum distillation is used to purify gadolinium, then some impurities can be removed, but gas impurities O and N are difficult to remove and the process has long operation time
Solution Approach 1:
The invention changes the purification parameters by using arc plasma technology with specific discharge current (100-200A) and time (10-30 minutes) settings in argon and air atmospheres, achieving rapid removal of gas impurities O and N while obtaining high-purity gadolinium and GONPs, thus resolving the contradiction between purity and operation time
Solution Approach 2:
The invention replaces the traditional mechanical vacuum distillation system with an arc plasma system that uses electrical discharge to create high-temperature plasma for purification, enabling faster removal of gas impurities including O and N while reducing operation time from hours to minutes
2Manufacturing precision
If electrolytic refining is used to purify gadolinium, then metal can be purified, but the process has long operation time and high risk of metal contamination
Solution Approach 1:
The invention uses argon atmosphere during the arc plasma purification process to create an inert environment that prevents metal contamination, eliminating the contamination risk associated with electrolytic refining while maintaining high purification efficiency and short operation time
3Manufacturing precision
If traditional purification methods are used, then metal can be purified, but the process has low efficiency and poor environmental conditions
Solution Approach 1:
The invention replaces traditional mechanical and chemical purification methods with arc plasma technology that uses electrical discharge to create high-temperature plasma, achieving rapid vaporization and removal of impurities with purification efficiency dramatically improved from hours to minutes while maintaining excellent environmental conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves high impurity removal rates, efficient purification, and environmental friendliness, resulting in high-purity gadolinium oxide nanomaterials with uniform particle size and good dispersibility, as demonstrated by inductively coupled plasma mass spectrometer (ICP-MS) results and X-ray diffractometer (XRD) and transmission electron microscope (TEM) analysis.
Implementation Method 1
An integrated method using arc plasma technology for metallurgical purification of metallic gadolinium
Implementation Method 2
effectively removing impurities and producing high-purity, small-sized, and dispersible GONPs
Implementation Method 3
preparation of GONPs by arc plasma
Implementation Method 4
preparation of gadolinium oxide nanomaterials
Data Source
AI summary
The invention discloses a method about the integration of the metallurgical purification of metallic gadolinium and the preparation of gadolinium oxide nanoparticles (GONPs) by arc plasma. The method includes the metallurgical purification and the nanoparticle preparation. Firstly, the gadolinium ingot and a tungsten rod respectively act as an anode and a cathode. After the arc furnace is evacuated and then is filled with a working atmosphere, impurities in the gadolinium ingot are removed in the form of volatilization to obtain purified gadolinium by the first arc discharge. Whereafter, the purified gadolinium and the tungsten rod are used as the anode and cathode. After the arc furnace also is evacuated and then also is filled with a working atmosphere, GONPs are obtained from the inner wall of the arc furnace though the second arc discharge. The metallurgical purification of metallic gadolinium and the preparation of GONPs were integrated by arc plasma.