Development of an Electrochemical Method to Investigate the Thermodynamic Behavior of Lanthanum and Sulfur in Liquid Steel
Name
suzuki-teppeis-sm-dmse-2021-thesis.pdf
Description
Thesis PDF
Size
1.39 MB
Format
Adobe PDF
Checksum (MD5)
68817675ff9f9a03ff3b91940080d107
Author(s)
Suzuki, Teppei
Advisor(s)
Allanore, Antoine
Date Issued
June 2021
Publisher
Massachusetts Institute of Technology
Abstract
Since rare earth elements (REE) have great potential to improve mechanical properties of steel by refining grains and controlling the distribution and the shape of inclusions, REE may be widely used in steel industry. Currently, the method for REE separation is solvent extraction. Since this method has economic and environmental problems, more efficient process is strongly required. In this study, I look at vacuum distillation of RE sulfide. The challenge is that thermodynamic data of RE sulfide of gas phase are insufficient. Therefore, I investigated the thermodynamic properties of gaseous rare earth compounds to evaluate the feasibility of vacuum distillation of RE sulfide, here during the steelmaking process. To study the thermodynamic behavior of REE, especially La in liquid steel at high temperature, an electrochemical method (EMF) using Laβ” Al2O3 solid electrolyte has been developed and its performances are herein discussed.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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