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        • KCI등재

          특허검색(特許檢索)에 의한 폐전기(廢電氣).전자기기(電子器機) 재활용(再活用) 기술(技術) 동향(動向)

          유경근,이재천,정진기,강경석,Yoo,,Kyoung-Keun,Lee,,Jae-Chun,Jeong,,Jin-Ki,Kang,,Kyung-Seok 한국자원리싸이클링학회 2009 資源 리싸이클링 Vol.18 No.4

          폐전기 전자기기 재활용 관련 기술의 추이 및 동향을 조사하기 위하여 출원된 특허의 검색을 실시하였다. 특허 검색 데이터베이스는 국내 WIPS사의 특허검색 사이트를 이용하였으며, 검색된 특허의 요약문을 분석하여 최종적으로 223건을 선정하였다. 1986년부터 2007년까지의 특허를 주요 국가별, IPC 분류별, 주요 출원인(회사)별, 관련 기술별, 대상물질별로 분류하여 분석하였다. 특허출원국 및 출원인 국적 분석에서 일본이 가장 많은 특허를 출원하였으며, 물리적 전처리 기술에 관한 특허출원이 가장 많았다. 대상물질 중 인쇄회로기판에 대한 출원이 가장 많았으며 이는 인쇄회로기판이 유가금속 함유량이 높아 부가가치가 높기 때문이다. The patents were searched to investigate the trend and the direction of technologies about the recycling of WEEE (waste electric and electronic equipment). Database was collected from WIPS site, and then 223 patents were selected by investigating abstracts. The patents from 1986 to 2007 were analyzed according to countries, international patent classification (IPC), companies, technologies, and recycling-target materials. The most patents were applied in Japan and by Japan companies. Patents about physical pretreatment technology are the most among the patents of the WEEE recycling technologies. Patents about printed circuit boards among target materials are the most because of its high value-added.

        • KCI등재

          염산용액에서의 황동광 침출에 대한 산화환원전위의 영향

          유경근,이재천,정진기,손정수 한국자원공학회 2008 한국자원공학회지 Vol.45 No.1

          Redox potential dependence of chalcopyrite leaching has been investigated to improve low leaching rate of chalcopyrite and it was reported that there is an optimum redox potential for high leaching rate in relatively low redox potential zone. In the present study, chalcopyrite leaching test was performed in chloride media with ferric ions at 50℃ or 80℃, and the redox potential dependence was investigated. The concentration of copper increases gradually with time, and then rapidly increases after around 20 minutes at 80℃ and after around 7 hours at 50℃, respectively. Oxidation-reduction potential (ORP) decreases with time because ferrous ions are leached from chalcopyrite. Leaching rate of chalcopyrite is much faster in the experiment at 80℃ than at 50℃. There is the highest leaching rate around 440 mV (vs Ag/AgCl), and this result indicates that chalcopyrite leaching depends on redox potential in chloride media.

        • KCI등재

          폐(廢)리튬일차전지(一次電池)의 안정적(安定的) 해체(解體)를 위한 연구(硏究)

          유경근,김명화,신선명,양동효,강진구,손정수,Yoo,,Kyoung-Keun,Kim,,Myoung-Hwa,Shin,,Shun-Myung,Yang,,Dong-Hyo,Kang,,Jin-Gu,Sohn,,Jeong-Soo 한국자원리싸이클링학회 2007 資源 리싸이클링 Vol.16 No.4

          고열 및 파절단에 의하여 폭발위험이 있는 폐리튬일차전지를 재활용하기 위해서는 폐리튬일차전지의 안정적 해체공정이 필수적이다. 본 연구에서는 폐리튬일차전지의 안정적 해체를 위한 최적 방전공정 조건을 연구하였다. $0.5kmol{\cdot}m^{-3}$ 황산용액을 이용하여 안정화를 진행한 결과, $35^{\circ}C$에는 4일째에 그리고 $50^{\circ}C$에는 1일째에 안정적 파쇄가 가능하였으며, 높은 반응온도에서 보다 빠른 안정화 결과를 얻을 수 있었다. 황산만을 사용하여 안정화를 진행할 경우, 재활용 가능한 폐리튬일차전지 금속의 손실이 크기 때문에 황산과 증류수를 이용하여 2단으로 안정화하는 공정을 제안하였으며, $0.5kmol{\cdot}m^{-3}$ 황산으로 6시간 안정화시킨 후, 증류수로 24시간 안정화한 결과, 폐리튬일차전지는 안정적으로 파쇄되었으며 금속의 손실도 적어 향후 재활용공정의 경제성 향상이 가능하다고 판단되었다. Dismantlement of lithium primary batteries without explosion is required to recycle the lithium primary batteries which could be exploded by heating too much or crushing. In the present study, the optimum discharging condition was investigated to dismantle the batteries without explosion. When the batteries were discharged with $0.5kmol{\cdot}m^{-3}$ sulfuric acid, the batteries became inert after 4 days at $35^{\circ}C$ and after 1 day at $50^{\circ}C$, respectively. This result shows that higher temperature accelerates inert of the batteries. Because loss of metals recycled increases when the batteries are discharged only with the sulfuric acid, discharging process using acid solution and water was newly proposed. When the batteries were discharged with water during 24 hours after discharging with $0.5kmol{\cdot}m^{-3}$ sulfuric acid during 6 hours, the batteries discharged were dismantled without explosion. Because decrease in loss of metals was accomplished by new process, the recycling process of the batteries could become economic by the 2-step discharging process.

        • KCI등재

          광산배수처리를 위한 황산염환원균의 응용

          유경근,정진기,손정수,이재천 한국자원공학회 2006 한국자원공학회지 Vol.43 No.2

          Sulfate-reducing bacteria(SRB) are obligate anaerobes and obtain energy from the process to reduce sulfates into sulfides. SRB have attracted interest in the treatment of acid mine drainage(AMD) because the biogenic sulfide reacts easily with heavy metal in solutions, and precipitates as metal sulfide. In the present article, the effects of pH, heavy metal ions, substrates, temperature, concentration of sulfides, types of reactor on the removal of heavy metal from mine drainage by SRB were summarized and discus sed. 황산염환원균은 황산염을 환원하여 황화수소를 생성하는 과정에서 에너지를 획득하는 편성혐기성세균이다. 황산염환원균에 의해 생성된 황화수소는 중금속과 반응하여 황화금속으로 침전하기 때문에 광산배수 중의 황산염과 중금속을 동시에 제거할 수 있는 세균으로서 주목을 받아왔다. 이 글에서는 황산염환원균을 이용한 광산배수 중의 중금속 제거에 미치는 pH, 중금속 이온, 기질, 온도, 황화수소의 농도, 반응기 등의 영향에 대하여 지금까지 발표된 연구결과들을 정리하고 고찰하였다.

        • KCI등재

          Optimum Conditions of Dismantlement for Recovery of Valuables from Spent Lithium Primary Batteries

          유경근,김홍인,손정수 한국자원리싸이클링학회 2019 資源 리싸이클링 Vol.28 No.4

          Dismantlement of lithium primary batteries without explosion is required to recycle the lithium primary batteries which could be exploded by heating too much or crushing. In the present study, the optimum discharging condition was investigated to dismantle the batteries without explosion. When the batteries were discharged with 0.5 kmol·m 3 sulfuric acid, the reactivity of the batteries decreased after 4 days at 35 ℃ and after 1 day at 50 ℃, respectively. This result shows that higher temperature removed the high reactivity of the batteries. Because loss of metals recycled increases when the batteries are discharged only with the sulfuric acid, discharging process using acid solution and water was newly proposed. When the batteries were discharged with water during 24 hours after discharging with 0.5 kmol·m 3 sulfuric acid during 6 hours, the batteries discharged were dismantled without explosion. Because decrease in loss of metals was accomplished by new process, the recycling process of the batteries could become economic by the 2-step discharging process.

        • KCI등재

          저등급 석탄의 활용기술 현황

          유경근,정문영 한국자원공학회 2014 한국자원공학회지 Vol.51 No.3

          The development for processing technologies of low rank coal (brown & subbituminous coal), which has disadvantages such as non-agglomerating property, low calorific value according to high inherent moisture content, susceptibility to spontaneous combustion, was required to diversify bituminous coal import markets in Korea, importing more than 98.5 % of coal. In the present article, the development direction of domestic processing technologies for low rank coal was suggested by summarizing the reserves of low rank coal and by categorizing the utilizing technologies of low rank coal to liquid (CTL) technology, coal gasification technology, integrated gasification combined cycle (IGCC) technology, and mine mouth power plant (MMPP). 석탄의 98.5 %를 수입에 의존하고 있는 우리나라는 유연탄 중심의 석탄사용을 다변화하기 위해 점결성이 없고, 수분함량이 높아 발열량이 낮으며, 자연발화되기 쉬워 활용이 어려운 저등급 석탄(갈탄 및 아역청탄)의 활용기술 개발이 필수적이다. 이 글에서는 저등급탄의 부존현황을 정리하고 활용기술로 액화기술, 가스화기술, 가스화복합발전기술, MMPP(Mine Mouth Power Plant)기술로 대별하고 분석・제시하여 국내외에서 자주개발 중 인 저등급 석탄의 활용기술 활성화에 도움이 되고자 하였다.

        • 銀 超微粒子의 燒結 擧動에 關한 硏究

          유경근 서울産業大學校 1993 논문집 Vol.37 No.1

          Sintering of ultra-fine silver particles was investigated. The silver UFPs(Ultra Fine Particle) show low temperature sintering, which is found to be initiated at about 130℃ and finished at around 414℃. It appears that the sintering is governed by the two main diffusion mechanisms; surface diffusion stage [130℃ (~1/7.4 Tm) -280℃ (~1/3.34Tm)] and grain boundary diffusion stage [(280℃-414℃ (~1/2.32Tm)]. The sintered body has much greater micro hardness than that of bulk material. The activation energy was determined to be about 0.17eV based on measurement of electrical resistivity during the progress of sintering.

        • KCI등재

          사문석으로부터 마그네슘의 黃酸浸出과 물유리의 製造

          유경근,김동진,정헌생,김민석,이재천 한국자원공학회 2008 한국자원공학회지 Vol.45 No.3

          The optimization of Mg leaching from serpentine and the utilization of leaching residue are required for practical use of CO2 sequestration by carbonation of serpentine. Magnesium was leached from serpentine with sulfuric acid and then glass water was prepared using leaching residue obtained from the leaching test. The effects of concentration of sulfuric acid, temperature and time of leaching, and pulp density on leaching of magnesium were investigated. Leaching efficiency increased to 95% under the optimum conditions; 4.0 M in sulfuric acid, 90°C in temperature, 60 minutes in leaching time, 200 g/L in pulp density. The leaching residue contained about 80% Si and is porous with 350 m2/g in surface area. The effects of NaOH concentration, temperature and time of reaction, pulp density on dissolution rate of the residue were investigated. When glass water was synthesized at room temperature, the SiO2/Na2O ratio in glass water was 3.817. Therefore, the new process in this study was found to be an attractive alternative to conventional processes operated at high temperature.

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