• 한국분말재료학회지
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• 제22권1호
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• pp.27-31
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• 2015

Flat panel display devices are mainly used as information display devices in the 21st century. The worldwide waste flat panel displays are expected at 2-3 million units but most of them are land-filled for want of a proper recycling technology More specifically, rare earth metals of La and Eu are used as fluorescent materials of Cold Cathode Flourscent Lamp(CCFL)s in the waste flat panel displays and they are critically vulnerable and irreplaceable strategic mineral resources. At present, most of the waste CCFLs are disposed of by land-filling and incineration and proper recovery of 80-plus tons per annum of the rare earth fluorescent materials will significantly contribute to steady supply of them. A dearth of Korean domestic research results on recovery and recycling of rare earth elements in the CCFLs prompts to initiate this status report on overseas research trends and noteworthy research results in related fields.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2004년도 학술논문집
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• pp.337-337
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• 2004

As one of researches for the P ＆ T purposes, a basic experiment on the recovery of actinide elements from the mixture with rare earth elements by means of electrorefining using a liquid cadmium cathode in the LiCl-KC1 eutectic melt was carried out. In order to examine the behaviors of electrodeposition of metal ions on a liquid electrode, recovery experiments of rare earth metals resulting from forming electrodeposits were performed by a galvanostatic electrolysis method at various current densities. A cyclic voltammetric technique was applied to determine reduction-oxidation potential of each metal element in the melt and to detect the changes of the multi component melt composition for on-line monitoring. Also, a collaboration study with RIAR was completed to test the preliminary feasibility on a recovery of actinide elements from the mixture with rare earth elements using a liquid cadmium cathode and actinide metals. Experimental results showed that the ratio of actinides to rare earths, 9: 0.5∼1 led to the rare earth content of about 5∼10 wt% in the deposit.

• 대한금속재료학회지
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• 제49권11호
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• pp.874-881
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• 2011

The present study describes a new technique to extract the primary silicon from an Al-Si alloy melt using centrifugal force during its solidification. The primary silicon was separated from an Al-50 wt.%Si alloy by centrifugal force in the form of a foam, which facilitated subsequent acid leaching to extract the pure silicon due to its wide surface area. The foam recovery after centrifugal separation was decreased as centrifugal acceleration was increased. The final recovery after acid leaching became closer to the solid fraction of the alloy, which was calculated from the Al-Si binary phase diagram, with increasing centrifugal acceleration due to the effective removal of the attached Al on the foam. The purity of the primary silicon obtained by the centrifugal separation method was over 99.99%, with only aluminum being also present.

• 한국자원리싸이클링학회:학술대회논문집
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• 한국자원리싸이클링학회 2003년도 추계정기총회 및 국제심포지엄
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• pp.22-34
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• 2003

Processing and smelting of copper containing sulphide concentrates result in the accumulation of impurities into various process streams. All primary copper smelters and refineries around the world produce significant amounts of slag, dust, sludge, residues and others, which contain copper and precious metals. The recovery of these valuable metals is essential to the overall economics of the smelting process. Physical, chemical and mineralogical characterization of particular slag and Cottrell dusts from primary smelters and Dore furnace (TBRC) slag and Pressure Leached Anode slimes from a copper refinery have been carried out to understand the basic behind the recovery processes. Various process options have been evaluated and adapted for the treatment of slag from different smelting furnaces and Cottrell dusts as well as the intermediate products from copper refineries. Besides the hydro- or pyre-metallurgical treatments, the above mentioned physical separation options such as magnetic, gravity separation, flotation and precipitation flotation processes have been successfully identified and adapted as the possible process options to produce a Cu-rich or precious metal-rich concentrates for in-house recycling and other valued by-product for further treatment. The results of laboratory, pilot plant and production operations are presented, and incorporation of several alternative flowsheet is discussed in this paper.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2003년도 Proceedings of the international symposium on the fusion technology
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• pp.590-597
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• 2003

Processing and smelting of copper containing sulphide concentrates result in the accumulation of impurities into various process streams. All primary copper smelters and refineries around the world produce significant amounts of slag, dust, sludge, residues and others, which contain copper and precious metals. The recovery of these valuable metals is essential to the overall economics of the smelting process. Physical, chemical and mineralogical characterization of particular slag and Cottrell dusts from primary smelters and $Dor\'{e}$ furnace (TBRC) slag and Pressure Leached Anode slimes from a copper refinery have been carried out to understand the basic behind the recovery processes. Various process options have been evaluated and adapted for the treatment of slag from different smelting furnaces and Cottrell dusts as well as the intermediate products from copper refineries. Besides the hydro- or pyro-metallurgical treatments, the above mentioned physical separation options such as magnetic, gravity separation, flotation and precipitation flotation processes have been successfully identified and adapted as the possible process options to produce a Cu-rich or precious metal-rich concentrates for in-house recycling and other valued by-product for further treatment. The results of laboratory, pilot plant and production operations are presented, and incorporation of several alternative flowsheet is discussed in this paper.

• 한국재료학회:학술대회논문집
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• 한국재료학회 1999년도 춘계학술발표강연 및 눈문개요집
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• pp.85-85
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• 1999

• 기계와재료
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• 제10권3호통권37호
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• pp.54-62
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• 1998

• 자원리싸이클링
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• 제22권4호
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• pp.3-11
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• 2013

폐촉매를 침출한 산성용액으로부터 용매추출에 의해 몰리브덴과 바나듐을 회수하는 공정을 조사하였다. 여러 침출액중 황산용액이 두 금속의 회수측면에서 가장 적합하다. 다른 불순물이 혼합된 용액과 순수한 몰리브덴과 바나듐용액에서 여러 추출제(양이온, 중성, 아민, 양이온과 중성 혼합추출제)에 의한 두 금속의 추출 및 탈거 거동을 검토하였다. 각 추출제는 금속 분리와 제 3상의 형성측면에서 장단점을 지니고 있다. 폐촉매의 산성 침출액으로부터 몰리브덴과 바나듐을 분리회수하는데 있어서 양이온과 중성의 혼합추출제가 가장 적합하다.

• Archives of Metallurgy and Materials
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• 제66권4호
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• pp.983-986
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• 2021

This study investigated the recovery behavior of valuable metals (Co, Ni, Cu and Mn) in spent lithium ion-batteries based on Al₂O₃-SiO₂-CaO-Fe₂O₃ slag system via DC submerged arc smelting process. The valuable metals were recovered by 93.9% at the 1250℃ for 30 min on the 20Al₂O₃-40SiO₂-20CaO-20Fe₂O₃ (mass%) slag system. From the analysis of the slag by Fourier-transform infrared spectroscopy, it was considered that Fe₂O₃ and Al₂O₃ acted as basic oxides to depolymerize SiO₄ and AlO₄ under the addition of critical 20 mass% Fe₂O₃ in 20Al₂O₃-40SiO₂-CaO-Fe₂O₃ (CaO + Fe₂O₃ = 40 mass%). In addition, it was observed that the addition of Fe₂O₃ ranging between 20 and 30 mass% lowers the melting point of the slag system.

• 대한화학회지
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• 제63권6호
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• pp.446-452
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• 2019

젖산을 이용하여 안전하게 양극활물질에 있는 Co, Mn, Ni을 침출할 수 있는 방법을 개발하였다. 양극활물질을 젖산으로 침출 시켰을 때, 젖산의 농도는 1N과 4 N 이상에서 보다는 2 N에서 가장 높은 효율을 보였다. 양극활물질을 단계적으로 젖산 용액에 첨가 하였을 때, 최대 용해도는 2 N의 젖산 용액에서 1 L 당 30 g이었다. 젖산 용액에 옥살산을 첨가하였고 희유금속들은 1 L 당 4 g에서 가장 경제적인 회수율을 보였다. 본 연구를 바탕으로 해서, 양극활물질로부터 희유금속들을 회수하기 위한 최적의 조건은 무게비로 옥살산과 양극활물질이 7 : 1이라는 것을 확인할 수 있었다. 첨가하여, 옥살산에 의해서 생성된 침전물은 Co, Ni, Mn 3성분이 결합되어 있는 다핵 결정성 물질이었다.