희토류 침전물로부터 LiCl-KCl 공융염의 증류 분리에 관한 기초연구

Fundamental Study on a Distillation Separation of a LiCl-KCl Eutectic Salt from Rare Earth Precipitates

양희철, 은희철, 김인태

Abstract

The distillation rate on LiCl-KCl eutectic salt under different vacuums from 0.5-50 mmHg was first investigated by using both a non-isothermal and a isothermal thermogravimetric (TG) analysis. Based on the non-isothermal TG data, distillation rate equations as a function of the temperature could be derived. Calculated flux by these model flux equations was in agreement with the distillation rate obtained from isothermal TG analysis. A distillation rate of 10-4-10-5 mole cm-2 sec-1 is obtainable at temperatures less than 1300K and vacuums of 0.5-50 mmHg. About a 99% salt distillation efficiency was obtained after an hour at a temperature above 1150 K under 50 mmHg in a small scale distillation test system. An increase in the vaporizing surface area is relatively effective for removing residual salt in the remaining particles, when compared to that for the vaporizing time. Over 99.95% of total distillation efficiency was obtained for a 1-h distillation operation by increasing the inner surface area from 4.52 cm2 to 12.56 cm2.

Key Words : 전해환원, 사용후핵연료, 용융염, 금속전환, 파이로공정, LiCl-KCl eutectic salt, Vacuum distillation, Salt removal, Rare earth precipitate, Thermogravimetric analysis

Reference

JNFCWT

Online Submission

Korean Radioactive
Waste Society (KRS)

Editorial Office
Contact Information

- Tel: +82-42-861-5851, 866-4157
- Fax: +82-42-861-5852
- E-mail: krs@krs.or.kr

SITE MAP