Determination and Calculation of NdF3-LiF Binary SystemChinese Full Text
Xue Juanqin;Liu Zhifei;Zhang Jie;Tang Changbin;Bi Qiang;School of Metallurgical Engineering,Xi’an University of Architecture and Technology;
Abstract: Electrolysis of Nd2O3 in fluoride melts was the main process for the production of neodymium metal in recent industry. Determination of the optimal production technology,the guarantee of product quality and better comprehensive performance of molten salt selection depend on the utilization and analysis of NdF3-LiF binary system fusibility figure directly. In order to obtain the precise NdF3-LiF binary phase diagram and thermodynamic information,differential thermal analysis（ DTA） was used to determine the DTA curve of NdF3-LiF binary system with different ratios,from which the liquidus temperatures of the binary system at the ratio can be analyzed,and at the same time characterizing method of scanning electron microscopy（ SEM） was used to verify the exactness of the experiment,and the experimental phase diagram was drawn out on the basis of DTA test results. Then,the calculated phase diagrams can be obtained according to the CALPHAD method with the Compound,Solution,Equilib,OptiSage and Phase diagram module optimization in FactSage; it was found that the actual NdF3-LiF molten salt system accords with the regular solution. Under 1000 1100 ℃,the activity coefficient of LiF tended to be stable,and NdF3 activity coefficient which varied with temperature had obvious increasing trend,and the ionized form was closely related to the amount of ions and the electrolytic process. In addition,Computer processing was used to fit the mathematical model of liquidus temperature in phase diagram,and it was put forward that the suitable mixture ratio of industrial fused salt electrolysis neodymium was w（ NdF3） ∶ w（ LiF） =10∶1 or slightly smaller ratio w（ NdF3） ∶ w（ LiF） =9∶1.
Keywords：
molten salt electrolysis; neodymium; NdF3-LiF binary system; phase diagram; liquidus temperature;
- DOI：
10.13373/j.cnki.cjrm.2014.05.015
- Series：
- Subject：
- Classification Code：
TF845
- Mobile Reading
Read on your phone instantly
Step 1Scan QR Codes
"Mobile CNKI-CNKI Express" App
Step 2Open“CNKI Express”
and click the scan icon in the upper left corner of the homepage.
Step 3
Scan QR Codes
Read this article on your phone.
- HTML
- CAJ Download
- PDF Download
Download the mobile appuse the app to scan this coderead the article.
Tips: Please download CAJViewer to view CAJ format full text.
Download: 374 Page: 832-838 Pagecount: 7 Size: 332K
Citation Network
Related Literature
- Similar Article
- Reader Recommendation
- Associated Author