• Proceedings of the Korean Radioactive Waste Society Conference
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• 2011.05a
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• pp.137-138
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• 2011

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2012.05a
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• pp.81-82
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• 2012

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2012.05a
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• pp.109-110
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• 2012

• Resources Recycling
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• v.24 no.3
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• pp.11-15
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• 2015

In order to develop a technology for the recovery of pure tin from the Sn containing industrial wastes (SIWs), a process consisted of high temperature reduction and electrorefining was investigated. The tin which exists as oxide in SIWs was successfully reduced by two consecutive high temperature treatments and 92.7% of the tin was recovered. The purity of the tin thus obtained was increased to 99.87% by electrorefining. By applying the results obtained in this work, a commercial process can be developed to produce pure tin metals from domestic spent resources, which can reduce the amount of tin imported from abroad.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.8 no.1
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• pp.9-17
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• 2010

The LCC (Liquid Cadmium Cathode) structure to be developed for inhibiting the formation and growth of the uranium dendrite has been known as a key part in the electrowinning process for the simultaneous recovering of uranium and TRU (TRans Uranium) elements from spent fuels. A zinc-gallium (Zn-Ga) experimental system which is able to be functional in aqueous condition and normal temperature has been set up to observe the formation and growth phenomena of the metal dendrites on liquid cathode. The growth of the zinc dendrites on the gallium cathode and the performance of the existing stirrer type and pounder type cathode structure were observed. Although the mechanical strength of the dendrites appeared to be weak in the electrolyte and easily crashed by the various cathode structures, it was difficult to effectively submerge the dendrite into the bottom of the liquid cathode. Based on the results of the aqueous phase experiments, a lab-scale electrowinning experimental apparatus which are applicable to the development of LCC srtucture for the electrowinning process was established and the performance tests of the different types of LCC structure were conducted to prohibit the uranium dendrite growth on LCC surface. The experimental results of the stirrer type LCC structures have shown that they could not effectively remove the uranium dendrites growing at the inner side of the LCC crucible and the performances of the paddle and harrow type LCC structure were similar. Therefore a mesh type LCC structure was developed to push down the uranium dendrites to the bottom of the LCC crucible growing on the LCC surface and at the inner side of the crucible. From the experimental results for the performance test of the mesh type LCC structure, the uranium was recovered over 5 wt% in cadmium without the growth of uranium dendrites. After completion of the experiments, solid precipitates of the bottom of the LCC crucible were identified as an intermetallic compound (UCd11) by the chemical analysis.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2004.06a
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• pp.333-333
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• 2004

고온의 용융염 매질에서 전해 정련 또는 전해제련에 의해 원하는 물질을 회수하기 위한 공정에 있어서 정확한 산화/환원 전위 측정 및 안정된 전위를 인가하기 위해서는 재현성과 내구성이 확보된 기준 전극이 필요하다. 용융염 매질에서 많이 사용되는 기준 전극은 Ag/AgCl 전극으로서 온도 사이클에 대한 전위의 히스테리시스가 작고 고온에서도 전위가 안정하다. Ag/AgCl 기준전극으로 pyrex 봉 하단부를 수 마이크론 두께의 pyrex 박막으로 제작된 것은 고온 용융염에 접촉시 열 충격, 전극류와 충돌에 의한 물리적 취약성 및 고온의 용융염에 의한 부식과 같은 단점이 있다.(중략)

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.314-315
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• 2015

티타늄은 높은 비강도로 알려지고 있어 항공기산업이나 군사산업에 주로 사용된다고 생각하기 쉽다. 그러나 해수와 같은 염화물이온을 함유한 수용액에 대해서는 뛰어난 내식성을 나타내며, 해양토목과 조선관계자는 초 내식성재료로 반영구적인 내구성을 갖는 재료로 보고 있다. 일반적인 페인트 방식법은 일정기간 후에 다시 칠해야 하는데다, 박리된 도료가 환경에 미치는 악영향도 염려되고 있다. 따라서 다시 칠하는 것이 곤란한 초대형 해양 부유구조물에는 티타늄이 매우 효과적인 것으로 기대할 수 있다. 그러나 티타늄은 광석을 제련하여 금속티타늄으로 제조하는 염화 환원공정이 곤란하고 고가여서 선체나 매우 큰 부유식의 해양구조물에는 보급되지 못했다. 따라서 티타늄재료를 선체 등의 구조재로 사용하지 않고 염가의 강판위에 도금하여 내식성을 향상시키는 방법을 생각할 수 있다. 또 해양구조물에 한정하지 않고, 대형 공공시설의 지붕재료나 해수담수화 설비, 화학플랜트 배관에 응용을 기대할 수 있고, 보급이 진전되면 스테인리스제품을 대체할 수도 있다. 티타늄의 평활전해석출 도금기술은 표면처리공학에서 최대의 새로운 개척분야인 것으로 사료된다. 본고에서는 티타늄의 평활피막전해석출 결과와 문제점에 대하여 기술하였다.

• Resources Recycling
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• v.26 no.3
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• pp.69-78
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• 2017

Magnesium has been used as parts of vehicles, case materials of notebook PC and mobile phone, and its demand has been increasing recently. Its extraction technologies were classified according to the two major reduction methods: the fused salt electrolysis and the thermal reduction method. A research on the extraction of magnesium from magnesite which has been being carried out at KIGAM was briefly introduced here. Magnesium was prepared using a fused salt electrolysis method through preparation of anhydrous magnesium chloride with lab scale experiments.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2004.06a
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• pp.339-339
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• 2004

원자로를 이용하여 장수명핵종(long lived nucleus)을 소멸처리하는 과정에서 초우라늄(TRU, transuranium)과 희토류(RE, rare earth) 금속에 포함되어 있는 소량의 핵분열성(fissile) 물질인 우라늄을 제거할 필요가 있다. 본 실험은 LiCl-KCl 용융염계에서 전해제련법(Electrowinning)을 이용하여 용융염욕에 존재하는 우라늄을 제거하기 위하여 필요한 Cd-Li 양전극 물질을 제조하였고, 제조된 금속을 이용하여 우라늄 및 란탄족(Dy, Ce, Y, Nd, Gd) 금속의 환원 특성을 파악하였다.(중략)

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2009.06a
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• pp.289-290
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• 2009