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주석 폐자원의 재활용을 위한 전처리 및 분급 공정에 대한 연구
박일정,김건홍,정항철 한국폐기물자원순환학회 2016 한국폐기물자원순환학회지 Vol.33 No.5
In this paper, tin-waste resources were pulverized and separated by cut-mill and multi cyclone separator, respectively. After the cut-mill process, more than 98% of the Pb-Sn and Sn-Ag-Cu scraps were recovered, and the by-products consisting of metal and oxide could be reused as solder. The separation of pulverized powders was performed using the minimum fluidization velocity depending on the density of the materials. When the flow rate was 21 L/min (70% blower output), it had the highest separation efficiency.
액상환원침전법 및 수열반응법을 이용한 주석산화물 결정 합성에 관한 연구
박일정,김건홍,김대원,최희락,정항철,Park, Il-Jeong,Kim, Geon-Hong,Kim, Dae-Weon,Choi, Hee-Lack,Jung, Hang-Chul 한국결정성장학회 2016 한국결정성장학회지 Vol.26 No.3
본 연구에서는 염화주석, 하이드라진 그리고 수산화나트륨을 원료로 하여 용액환원침전법과 수열반응법을 이용하여 주석산화물 결정을 제조하여, 주요 실험 변수에 의한 결정상 및 형상을 XRD와 SEM을 이용하여 분석하였다. 원료의 몰 비에 따라 구형 및 판상의 주석산화물 결정을 얻을 수 있었으며, 그 결정상은 SnO, $Sn_6O_4(OH)_4$이었다. 그리고 수열반응법에 의하여 얻어진 결정 모양은 온도 조건에 따라 판상 및 꽃 모양의 SnO 결정이 얻어졌다. In this work, tin oxides were obtained by the liquid reduction precipitation method and hydrothermal process using $SnCl_2{\cdot}2H_2O$, $N_2H_4$, and NaOH. Tin oxide crystals having different sizes and morphologies could be achieved. The powders were characterized by X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FE-SEM). Depending on the molar ratio of the raw materials, tin oxide crystalline with the spherical and rectangular plate-like shape could be obtained, the crystal phase was SnO and $Sn_6O_4(OH)_4$. And the obtained SnO crystals by a hydrothermal reaction showed various shapes, such as, spherical, plate-like and flower-like architectures depending on the temperature conditions.
박일정,김대원,김건홍,채홍준,이상우,정항철 한국청정기술학회 2017 청정기술 Vol.24 No.3
In this study, a new organophosphorus acid-based solvent (KMC-P) from KMC Co., Ltd. was used for the recovery of the iron chloride etching waste solution. In order to increase the extraction efficiency for the new solvent in the solvent extraction process, we selected the process variables and conducted the optimization experiment according to the DOE to investigate the correlation between the variables. Solvent concentration, pH, and O/A ratio were found to be factors affecting extraction and stripping efficiency. The optimum stripping efficiency was 69.7% when the solvent concentration was 29.4 wt%, the HCl addition amount was 0 mL, and the O/A ratio was 7, and the reliability was more than 86%. 본 연구에서는 염화철 에칭폐액 재생을 위하여 ㈜케이엠씨에서 조합한 organophosphorus acid계의 신규용매(KMC-P)를 사용하였으며, 용매추출공정에서 신규 용매에 대한 추출효율을 증가시키기 위해 공정변수를 선정하고 변수간의 상관관계를알아보기 위해서 DOE에 따른 최적화실험을 진행하였다. 용매 농도, pH, O/A ratio가 추출, 탈거효율에 영향을 미치는 인자로 나타났으며 최적의 탈거효율을 갖는 공정조건은 용매 농도 29.4 wt%, HCl 첨가량 0 mL, O/A ratio 7일 때, 최대 69.7%의탈거효율을 기대할 수 있는 결과를 얻었으며 신뢰 수준은 86% 이상인 것을 확인하였다.
Relaxation Behavior of Oxygen Vacancies in Sc-doped BaTiO3
박일정,한영호 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.9
The dielectric properties of the Ba(Ti1−xScx)O3−δ system have been studied as functions of the temperature and the frequency for x = 0.0005 to 0.05. The dielectric loss (tanδ) peak shifted to higher frequency with increasing Sc content, and the loss peak moved to higher frequency with increasing temperature, showing a thermally- activated process. Such a behavior was in good agreement with Debye’s equation. Two activation energies were estimated at Sc ≤ 1 mol% whereas a single activation energy was determined for x = 0.02 and 0.05 on the temperature range studied. At Sc ≤ 1 mol%, the activation energy at higher temperatures could be due to the dissociation of the defect complex (Sc Ti − V ·· O ) and to the swing motion of oxygen vacancies. The single activation energy at Sc ≥ 2 mol% implies that over the temperature range studied, the relaxation mechanism could be due to the reorientation of a dipolar complex without any oxygen vacancy dissociation.
폐니켈-카드뮴 침출용액으로부터 황화물 침전법을 이용한 카드뮴 회수에 대한 연구
박일정,김대원,김민준,정항철 대한금속·재료학회 2019 대한금속·재료학회지 Vol.57 No.11
A large amount of waste nickel-cadmium batteries are being produced, and various studies have been conducted to recover the valuable metals contained in the batteries. Solvent extraction is mainly used to recover nickel and cadmium, but that method has economic and environmental problems. In this study, to solve these problems, we investigated the recovery of cadmium by a sulfide precipitation method. The electrode powders obtained from the waste nickel-cadmium battery were leached with sulfuric acid to make a nickel-cadmium mixed solution. Na2S, (NH4)2S and FeS were used as a precipitant and added in a ratio of MeS/Cd = 0.5 – 2. Then, the precipitated powders and filtrate were analyzed to obtain CdS characteristics and cadmium recovery. The cadmium was separated by ion substitution which occurred when the sulfide was added to the nickel-cadmium solution. The recovery of cadmium increased with an increasing sulfide addition. Na2S did not generate any secondary phase, and this study confirmed that 100% of the cadmium in the nickelcadmium solution was recovered.
박일정(Il-Jeong Park),김대원(Dae-Weon Kim),김건홍(Geon-Hong Kim),채홍준(Hong-jun Chae),이상우(Sang-Woo Lee),정항철(Hang-Chul Jung) 한국청정기술학회 2017 청정기술 Vol.23 No.3
본 연구에서는 염화철 에칭폐액 재생을 위하여 ㈜케이엠씨에서 조합한 organophosphorus acid계의 신규용매(KMC-P)를 사용하였으며, 용매추출공정에서 신규 용매에 대한 추출효율을 증가시키기 위해 공정변수를 선정하고 변수간의 상관관계를 알아보기 위해서 DOE에 따른 최적화실험을 진행하였다. 용매 농도, pH, O/A ratio가 추출, 탈거효율에 영향을 미치는 인자로 나타났으며 최적의 탈거효율을 갖는 공정조건은 용매 농도 29.4 wt%, HCl 첨가량 0 mL, O/A ratio 7일 때, 최대 69.7%의 탈거효율을 기대할 수 있는 결과를 얻었으며 신뢰 수준은 86% 이상인 것을 확인하였다. In this study, a new organophosphorus acid-based solvent (KMC-P) from KMC Co., Ltd. was used for the recovery of the iron chloride etching waste solution. In order to increase the extraction efficiency for the new solvent in the solvent extraction process, we selected the process variables and conducted the optimization experiment according to the DOE to investigate the correlation between the variables. Solvent concentration, pH, and O/A ratio were found to be factors affecting extraction and stripping efficiency. The optimum stripping efficiency was 69.7% when the solvent concentration was 29.4 wt%, the HCl addition amount was 0 mL, and the O/A ratio was 7, and the reliability was more than 86%.
이온치환 반응을 이용한 니켈-카드뮴 폐이차전지에서 카드뮴의 분리에 대한 연구
김대원,박일정,안낙균,정항철,정수훈,최중엽,양대훈,Kim, Dae-Weon,Park, Il-Jeong,Ahn, Nak-Kyoon,Jeong, Hang-Chul,Jung, Soo-Hoon,Choi, Joong-Yup,Yang, Dae-Hoon 한국자원리싸이클링학회 2018 資源 리싸이클링 Vol.27 No.4
폐 니켈-카드뮴 전지의 재활용을 위하여 효율적으로 카드뮴과 니켈을 분리할 수 있도록 이온치환 반응을 이용하여 선택적으로 카드뮴을 분리하였다. 폐 니켈-카드뮴 전지 내의 전극을 분쇄하여 얻은 전극 분말을 황산에 침출시킨 니켈-카드뮴 용액에 황화나트륨을 첨가하여 CdS로 침전시켰다. 다양한 조건에서 이온치환실험을 실시하였으며, 최적조건으로는 상온에서 용액의 pH = -0.1, $Na_2S/Cd=2.3$일 때 용액 내 잔존하는 Cd은 약 100 ppm으로 대부분 CdS로 침전된 결과를 얻을 수 있었다.