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Semi-Continuous Electrowinning of LiCl-Li2O Molten Salt
Jin-Mok Hur,Chung-Seok Seo,Sun-Seok Hong,Dae-Seung Kang,Seong-Won Park 한국방사성폐기물학회 2004 방사성폐기물학회지 Vol.2 No.3
한국원자력 연구소에서 추진하고 있는 사용후핵연료 관리 이용 기술개발의 경제성과 환경친화성을 증진시키기 위해서 리튬회수 기술을 개발하고 관련 검증실험을 수행하였다. 본 기술은 1) 환원전극과 결합된 비전도성 다공성 마그네시아 용기를 이용한 용융염상에서의 산화리튬 전해, 2) 마그네시아 용기를 용융염 액위 이상으로 상승시켜, 용기 내에 회수된 리튬의 용융염으로부터의 분리, 3) 회수된 리튬의 진공 사이펀을 사용한 별도 저장조로의 이송이라는 3단계의 결합으로 특징지어 진다. 개발된 기술에 의하여 염화리튬-산화리튬 용융염으로부터 95% 이상의 수율로 리튬을 반연속적으로 회수할 수 있었다. A Li recovery technology has been developed and related experimental verification efforts were carried out to improve the economical viability and environmental friendliness of the 'Advanced Spent Fuel Conditioning Process' being developed at KAERI. This technology is characterized by the combination of 1) the electrolysis of in a molten salt by using a porous non-conducting magnesia container at the cathode, 2) the separation of the Li in the container from the molten salt by elevating the container above the level of a molten salt, 3) the transport of the Li in the container by using a vacuum siphon to a separated reservoir. Li was semi-continuously recovered from a LiCl- molten salt with a more than 95% yield by using the developed technology.
A Study on the Stability of MgO in a LiCl-Li₂O Molten Salt System
Hur, Jin-Mok,Kim, Ik-Soo,Lee, Won-Kyoung,Cho, Soo-Haeng,Seo, Chung-Seok,Park, Seong-Won 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.3
The stability of MgO was studied to verify its applicability to the LiCl-Li₂O molten salt based process. The interaction of MgO not only with molten salt but also with CO₂ and H₂O in relation to its property as a solid base was investigated. MgO was chemically stable at the typical operation temperature of the LiC1-Li₂O molten salt based process, 650℃. However, the stabilization of L i 2 0 structure on a MgO surface was observed when MgO is withdrawn from the molten salt. The result was clearly characterized by means of thermo-gravimmetry analysis, differential thermal analysis, X-ray diffraction analysis, thermodynamic analysis, and a CO₂ temperature programmed desorption. MgO can be considered as an acceptable candidate material for the high temperature molten salt industry.
MOLTEN SALT VAPORIZATION DURING ELECTROLYTIC REDUCTION
Hur, Jin-Mok,Jeong, Sang-Moon,Lee, Han-Soo Korean Nuclear Society 2010 Nuclear Engineering and Technology Vol.42 No.1
The suppression of molten salt vaporization is one of the key technical issues in the electrolytic reduction process developed for recycling spent nuclear fuel from light-water reactors Since the Hertz-Langmuir relation previously applied to molten salt vaporization is valid only for vaporization into a vacuum, a diffusion model was derived to quantitatively assess the vaporization of LiCl, $Li_2O$ and Li from an electrolytic reducer operating under atmospheric pressure. Vaporization rates as a function of operation variables were calculated and shown to be in reasonable agreement with the experimental data obtained from thermogravimetry.