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이덕희,신동윤,김태형,이찬기,박경수,이기웅,이재령,Lee, Duk-Hee,Shin, Dongyoon,Kim, Tae-Hyung,Lee, Chan-Gi,Park, Kyung-Soo,Lee, Ki Woong,Lee, Jaeryeong 한국자원리싸이클링학회 2019 資源 리싸이클링 Vol.28 No.2
Development of technology makes LED an economical option because of lower energy consumption and better environmental impact. Because higher consumer demand the LED market is expanding rapidly due to its environment-friendly advantages. Expansion of LED application, development of various fusion technologies, the emergence of new markets, and the large-scale expansion of markets would lead to a large volume of e-waste generation with valorization potential. Currently, most of the generated waste being that landfilled and incinerated due to the absence of technology and management system. In this paper, we review the current status of LED waste recycling and analyzes the available recycling technologies.
Synthesis and characterization of ZnS:Co nanoparticles prepared through wet chemical method
Jaeryeong Lee,이재령 한국자원공학회 2013 Geosystem engineering Vol.16 No.3
Homogeneous ZnS–Co-doped nanoparticles (ZnS:Co) were accomplished through wet chemical method with the aid of a buffer solution at room temperature. Based on theoretical calculations, the pH of the reaction and the type of buffer solution were determined. The results of X-ray diffraction analysis showed that the change of lattice constant in ZnS:Co can be detected with a change of Co concentration. The average size of ZnS nanocrystallites, estimated by the Debye–Sherrer formula, was about 3 nm. Also, optical and magnetic properties were tested with the ZnS:Co nanoparticles in various Co concentrations.
고강도 혼합분쇄 처리에 의한 인운모로부터 리튬의 수 침출 특성
김병진,김수윤,이재령,Kim, Byoungjin,Kim, Suyun,Lee, Jaeryeong 한국자원리싸이클링학회 2017 資源 리싸이클링 Vol.26 No.3
중액선별(HMS, heavy medium separation)을 통해 회수된 인운모(lepidolite) 정광(Li: 2.3%)으로부터 리튬을 수 침출하기 위해 황산칼슘 반수화염(CSH, calcium sulfate hemihydrate, $CaSO_4{\cdot}1/2H_2O$)과 혼합분쇄하여 기계화학적 효과를 연구하였다. 인운모를 CSH와 함께 고강도 분쇄한 결과, 리튬의 침출율이 4.48%에서 93.5%로 급격히 증가하였다. 이는 고강도 혼합분쇄 과정 중 발생되는 기계화학적 효과로 인해 결정구조가 파괴되면서 인운모와 CSH의 혼합물이 새로운 화합물로 형성되어 나타난 결과로 판단된다. 결과적으로 인운모로부터 상온에서 리튬의 수 침출이 가능함을 확인하였다. The concentrate of lepidolite, being treated by heavy medium separation (HMS), was ground with calcium sulphate hemihydrate (CSH, $CaSO_4{\cdot}1/2H_2O$) to investigate the mechanochemical effect for the Li leachability in water. This leachability increased, dramatically through the intensive grinding for the mixture, concentrate and CSH. The leachability of Li was improved from 4.48% to 93.5%. The grinding of the mixture destructed the crystal structure of the concentrate, and it might be formed to new compounds. As the result, Li in the concentrate can be extracted by water leaching at room temperature.
김영진,김승현,이재령,Kim, Youngjin,Kim, Seunghyun,Lee, Jaeryeong 한국자원리싸이클링학회 2019 資源 리싸이클링 Vol.28 No.6
This study aims to introduce and economical review on the possibilities of rare earth elements(REEs) recovery from coal ashes and the analysis of economical evaluation factors based on the data for securing domestic rare earth elements. The cut-off grade of REEs on recovering from coal ash was confirmed to be 1,000 ppm on total rare earth oxides(TREO) basis, and while the economic value of coal ash changed with contents and specific elements of rare earth elements. This shall be resulted in the price differences of rare earth elements required by the current industry, and it probably varies depending on the future demand of rare earth components. For developing of commercial recovery technology on REEs in coal ashes, many researches have been carried out by various analyzing methods, such as evaluation of holding value of REEs in ashes, assessment between supply and demand of industry, comparison of investment and its profitability for the REEs's production from coal ashes, and so on. Although these methods have been suggested, its recovery system with economical feasibility could not been confirmed up to present. In this reason, the process design of recovering REEs from coal ash shall be researched continuously to solve the problems of the global rare earth market. And also these researches shall be conducted actively in Korea for the purpose of securing the REEs resources and their recovering technologies.
알칼리 용융 및 수 침출을 이용한 탄화텅스텐으로부터 텅스텐 회수
김병진,김수윤,이재령,Kim, Byoungjin,Kim, Suyun,Lee, Jaeryeong 한국자원리싸이클링학회 2017 資源 리싸이클링 Vol.26 No.6
Tungsten (W) recovery from tungsten carbide (WC) was researched by alkali melt followed by water leaching. The experiments of alkali melt were carried out with the change of the sort of alkali material, heating temperature, and the heating duration. Water leaching of W was performed in the fixed conditions ($25^{\circ}C$, 2 hr., slurry density: 10 g/L). From the mixture of WC and sodium nitrate ($NaNO_3$) in the molar ratio of 1:2, treated at $400^{\circ}C$ for 6 hours, only 63.3% of W might be leached by water leaching. With the increase of sodium hydroxide (NaOH) as a melting additive, the leachability increased. Finally it reached to 97.8 % with the melted mixture of ($WC:NaNO_3:NaOH$) in the ratio of (1:2:2). This imply that NaOH may play a role as a reaction catalyst by lowering Gibb's free energy for alkali melt reaction for WC. 알칼리 용융법과 수 침출을 이용하여 탄화텅스텐(WC)으로부터 텅스텐(W) 회수에 관한 연구를 실시하였다. 알칼리 용융 처리는 알칼리염의 종류, 용융온도 및 용융시간을 변화시키면서 실시하였으며, 수 침출은 $25^{\circ}C$, 2시간 및 슬러리 농도 10 g/L로 고정하여 실시하였다. 알칼리염으로 질산나트륨($NaNO_3$)만 단독으로 사용한 경우, W의 수 침출율은 63.3%이었지만, 용융 첨가제인 수산화나트륨(NaOH) 혼합량이 증가할수록 침출율은 증가하였으며, 몰비 $WC:NaNO_3:NaOH=1:2:2$로 혼합한 용융물에서는 97.8%까지 증가하였다. NaOH는 용융 반응의 반응열 증가로 인한 반응 촉진제 역할을 한 것으로 판단된다.
알칼리화합물과 텅스텐/바나듐산화물의 기계화학반응을 이용한 수 침출 연구
김병진,김수윤,이재령,Kim, Byoungjin,Kim, Suyun,Lee, Jaeryeong 한국자원리싸이클링학회 2018 資源 리싸이클링 Vol.27 No.4
Water leaching of tungsten(W) and vanadium(V) was researched from their oxides through mechanochemical (MC) reaction with alkali compounds. Intensive grinding for the mixture of tungsten/vanadium oxide and alkali compounds (NaOH, $Na2CO_3$) was carried out with change of their mixing ratios and grinding duration. Water soluble compounds, $Na_2WO_4$ and $NaVO_3$, were synthesized through MC reaction and their solubilities increased in proportion to the mixing ratio of sodium compound and grinding times. Whereas vanadium leachability was less affected by the mixting ratio and grinding times. The leachabilities of 99.0% were accomplished by a short period of MC treatment, W (30 min.) and V (5 min.). This process enable us to extract W and V from their oxides via a water leaching, and can be applied to the selective recovery of W and V from $DeNO_x$ spent catalysts.
건식제련용 동 함유 슬러지 펠렛 제조 및 물리적 특성평가
김수윤,김영진,김승현,이재령,Kim, Suyun,Kim, Youngjin,Kim, Seunghyun,Lee, Jaeryeong 한국자원리싸이클링학회 2019 資源 리싸이클링 Vol.28 No.2
The pelletizing of printed circuit board (PCB) sludge was researched for copper recovery in pyrometallurgical process. This pelletizing was carried out by using self-manufactured compression-type apparatus after pre-treatments (drying, water scrubbing, size classification) were proceeded. The physical properties (compression strength and drop-breakage test) were tested with a change of sludge sizing and the number of compression. In the case of using the undersized sludge of #140, its properties were improved to 0.6 MPa and 9.3 times. Moreover, they increased to 0.82 MPa and 19.0 times by using the #140 ~ 325 sludge. These imply that the packing density increases due to the elimination of large-sized sludge (#140), and also the weight of required binder decreases by the removal of fine-sized sludge (#325).
서영진(Youngjin Seo),김연호(Yeonho Kim),김기남(Kinam Kim),김신규(Shingyu Kim),이재령(Jaeryeong Lee),정일권(Ilgwon Jeong) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
The efficiency of traction motor is directly related to the fuel economy of eco-friendly vehicle. To improve the efficiency of the motor, various technologies have been developed which reduce the main loss factor ? the copper loss arising from winding section and the core loss arising from laminated core. The purpose of this study is to improve the efficiency of the motor by reducing the core loss. By applying the new method of lamination that does not damage the electrical steel sheet and insulation between the sheets, the magnetic loss of core is minimized. In addition, the cohesion and rigidity of laminated core has improved compared to traditional methods, so the productivity and NVH characteristics of motor is improved also.