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재활용을 위한 폐 평판디스플레이 제품의 자동 비전인식 장비의 개발
이찬기(Chan Gi Lee),홍현선(Hyun Seon Hong),김종원(Jong Won Kim) 한국비파괴검사학회 2018 한국비파괴검사학회지 Vol.38 No.4
최근 폐 전기 전자제품 또는 전자제품 쓰레기의 재사용과 재활용에 대한 관심이 높아지고 있다. 특히 평판디스플레이는 텔레비전수상기, 컴퓨터 모니터, 휴대전화 등에 널리 사용되고 있어 이러한 관심의 중심에 있다. 본 연구의 목적은 재활용센터에서 평판디스플레이의 재활용 공정의 작업시간을 최소화하고 폐기부품을 잘 선별하도록 자동 비전인식 시스템으로 제조공정상의 정보를 제공하도록 하는 데 있다. 자동 비전인식 시스템은 폐 평판디스플레이의 후면부를 보고 크기를 인식하는 1차 비전부와 라벨로부터 모델명을 인식하는 2차 비전부로 구성되어 있다. 이 인식장비는 1분 이내의 스캔 결과를 이용하여 1초 이내에 모델정보를 제공할 수 있음을 실험적으로 확인하였다. Reusing and recycling waste electrical and electronic equipment (WEEE) or electronic waste (E-waste) is a topic of popular interest. In particular, flat panel displays (FPDs) are at the center of this interest because they are widely used as television displays, computer monitors, and mobile phone screens. This work targets the minimizing of their recycling processing time in a recycling factory using a vision-based inspection system to sort the E-wastes based on their manufacturing information. The automatic vision inspection system is composed of two cameras, one for macro vision to check the size and another for micro vision to identify the model name from the label of the inspected waste. In the experiment, this vision-based system provides the disassembly process of FPDs in one minute and their model information in one second.
MOCVD 더스트 합성용액으로부터 D2EHPA를 이용한 In의 선택적 용매추출
임병용,이찬기,박재량,박경수,심종길,박정진,Im, Byoungyong,Swain, Basudev,Lee, Chan Gi,Park, Jae Layng,Park, Kyung-Soo,Shim, Jong-Gil,Park, Jeung-Jin 한국자원리싸이클링학회 2015 資源 리싸이클링 Vol.24 No.5
In, Ga, Fe, Al이 함유되어 있는 혼합용액으로부터 In을 분리하기 위해 D2EHPA를 이용한 용매추출 연구를 수행하였으며, In의 추출에 대한 수상의 HCl 및 추출제 농도 효과를 확인하였다. In과 Ga의 추출률은 HCl 농도의 감소에 따라 증가하였지만, Fe와 Al의 추출률에는 큰 영향을 미치지 않았다. In과 Ga의 분리인자($D_{In}/D_{Ga}$)는 1.0 M D2EHPA, 0.5 M HCl조건에서 115로 나타났다. 즉, D2EHPA는 혼합용액으로부터 In을 분리하는 추출제로 적합하며, 추출률 및 분리인자는 HCl 및 추출제의 농도 조절을 이용하여 조절할 수 있다. The separation of In from the synthesis solution with Ga, Fe, and Al has been studied by the solvent extraction using D2EHPA as an extractant. The effects as a function of the concentration of extractant and HCl on the extraction of In were investigated. The extraction of In and Ga increased with decreasing HCl concentration, but that of Fe and Al was independent. Separation factor between In and Ga of 115 was obtained at 1.0 M D2EHPA in the presence of 0.5 M HCl of feed solution. Consequently, this study shows that D2EHPA is suitable extractant for In extraction from the synthesis solution. Extraction efficiency and separation factor could be increased by controlling HCl and extractant concentration.
수소화-탈수소화법을 이용한 탄탈륨 스크랩으로부터 탄탈륨 분말 제조 연구
이지은,이찬기,박지환,윤진호,Lee, Ji-eun,Lee, Chan Gi,Park, Ji Hwan,Yoon, Jin-Ho 한국자원리싸이클링학회 2018 資源 리싸이클링 Vol.27 No.5
For recylcing of high purity tantalum (Ta) scrap, We investigated manufacture of tantalum powder using hydride-dehydride (HDH) process. Tantalum had excellent properties such as ductile, hardness and high melting point. Usually these properties made difficult to make a powder. In this study, Tantalum powder was manufactured using Tantalum hydride via hydridation. Tantalum hydride was formed at $500^{\circ}C$, 5 hr/$700^{\circ}C$, 3 hr and it is easy to make a tantalum hydride powder because hydrogen in the tantalum act as a defect dislocation and lattice expansion. The powder was pulverized to a size of less than $10{\mu}m$ under a condition of 1300 rpm, 30 min using a ring mill, and tantalum powder with less than 50 ppm hydrogen was prepared through dehydridation in an Ar and low vacuum atmosphere.
특허(特許)와 논문(論文)으로 본 폐(廢) 디스플레이 재활용(再活用) 기술(技術) 동향(動向)
이성규,이찬기,홍현선,조영주,조봉규,Lee, Sung-Kyu,Lee, Chan-Gi,Hong, Hyun-Seon,Cho, Young-Ju,Cho, Bong-Gyoo 한국자원리싸이클링학회 2012 資源 리싸이클링 Vol.21 No.3
디스플레이는 액정 디스플레이(LCD), 음극선관(CRT), 플라즈마 디스플레이 패널(PDP), 발광 다이오드(LED), 유기 발광 다이오드(OLED) 등 여러 종류가 있다. 경제적, 효율적 관점에서 폐 디스플레이의 재활용 기술은 폭넓게 연구되어 왔다. 본 연구에서는 폐 디스플레이의 재활용 기술에 대한 특허와 논문을 분석하였다. 분석범위는 1980년~2011년까지의 미국, 유럽연합(EU), 일본, 한국의 등록/공개된 특허와 SCI 논문으로 제한하였다. 특허와 논문은 키워드를 사용하여 수집하였고, 기술의 정의에 따라 필터링하였다. 특허와 논문의 동향은 연도, 국가, 기업, 기술에 따라 분석하여 나타내었다. There are several kinds of displays such as liquid crystal display (LCD), cathode ray tube (CRT), plasma display panel(PDP), light emitting diode (LED), organic light emitting diode (OLED), etc. Nowadays, recycling technologies of waste displays have been widely studied from economy and efficiency points of view. In this paper, patents and literature on the recycling technologies of the waste displays have been comprehensively analyzed. The search was limited to the open patents of USA (US), European Union (EU), Japan (JP), and Korea (KR) and SCI journals published from 1980 to 2011. Patents and journals were systematically compiled and collected using key-words search and filtered by pre-set filtering criteria. The trends of the patents and journals were thus analyzed according to the years, countries, companies, and technologies.
Ammonium Hexafluorotitanate 전구체로부터 습식 공정을 이용한 불소 함유 TiO<sub>2</sub> 나노 분말 제조 및 광촉매 특성 연구
이덕희,박재량,이찬기,김현모,박경수,Lee, Duk-Hee,Park, Jae-Ryang,Lee, Chan-Gi,Kim, Hyeon-Mo,Park, Kyung-Soo 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.3
F-containing $TiO_2$ nanopowders are synthesized using simple wet processes (precipitation-based and hydrothermal) from ammonium hexafluorotitanate (AHFT, $(NH_4)_2TiF_6$) as a precursor to apply as a photocatalyst for the degradation of rhodamine B (RhB). The surface properties of the prepared samples are evaluated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). The results confirm that the synthesized anatase $TiO_2$ has sphere-like shapes, with numerous small nanoparticles containing fluorine on the surface. The photocatalytic activity of F-containing $TiO_2$ compared with F-free $TiO_2$ is characterized by measuring the degradation of RhB using a xenon lamp. The photocatalytic degradation of F-containing $TiO_2$ exhibits improved photocatalytic activity, based on the positive effects of adsorbed F ions on the surface.
저농도 은이 함유된 LTCC 전극공정부산물로부터 은 회수 및 나노입자 제조 연구
주소영,안낙균,이찬기,윤진호,Joo, Soyeong,Ahn, Nak-Kyoon,Lee, Chan Gi,Yoon, Jin-Ho 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.3
In this paper, the recovery and nanoparticle synthesis of Ag from low temperature co-fired ceramic (LTCC) by-products are studied. The effect of reaction behavior on Ag leaching conditions from the LTCC by-products is confirmed. The optimum leaching conditions are determined to be: 5 M $HNO_3$, a reaction temperature of $75^{\circ}C$, and a pulp density of 50 g/L at 60 min. For the selective recovery of Ag, the [Cl]/[Ag] equivalence ratio experiment is performed using added HCl; most of the Ag (more than 99%) is recovered. The XRD and MP-AES results confirm that the powder is AgCl and that impurities are at less than 1%. Ag nanoparticles are synthesized using a chemical reduction process for recycling, $NaBH_4$ and PVP are used as reducing agents and dispersion stabilizers. UV-vis and FE-SEM results show that AgCl powder is precipitated and that Ag nanoparticles are synthesized. Ag nanoparticles of 100% Ag are obtained under the chemical reaction conditions.
박경수,강이승,이찬기,홍현선,심종길,박정진,Park, Kyung-Soo,Swain, Basudev,Kang, Lee Seung,Lee, Chan Gi,Hong, Hyun Seon,Shim, Jong-Gil,Park, Jeung-Jin 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.3
Leaching of MOCVD dust in the LED industry is an essential stage for hydro-metallurgical recovery of pure Ga and In. To recover Ga and In, the leaching behavior of MOCVD scrap of an LED, which contains significant amounts of Ga, In, Al and Fe in various phases, has been investigated. The leaching process must be performed effectively to maximize recovery of Ga and In metals using the most efficient lixiviant. Crystalline structure and metallic composition of the raw MOCVD dust were analyzed prior to digestion. Subsequently, various mineral acids were tested to comprehensively study and optimize the leaching parameters such as acidity, pulp density, temperature and time. The most effective leaching of Ga and In was observed for a boiling 4 M HCl solution vigorously stirred at 400 rpm. Phase transformation of GaN into gallium oxide by heat treatment also improved the leaching efficiency of Ga. Subsequently high purity Ga and In can be recovered by series of hydro processes.