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홍현선,정항철,김건홍,강이승,석한길,Hong, Hyun-Seon,Jung, Hang-Chul,Kim, Geon-Hong,Kang, Lee-Seung,Suk, Han-Gil 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.3
Nano-sized cobalt powder was fabricated by wet chemical reduction method at room temperature. The effects of various experimental variables on the overall properties of fabricated nano-sized cobalt powders have been investigated in detail, and amount of NaOH and reducing agent and dropping speed of reducing agent have been properly selected as experimental variables in the present research. Minitab program which could find optimized conditions was adopted as a statistic analysis. 3D Scatter-Plot and DOE (Design of Experiments) conditions for synthesis of nano-sized cobalt powder were well developed using Box-Behnken DOE method. Based on the results of the DOE process, reproducibility test were performed for nano-sized cobalt powder. Spherical nano-sized cobalt powders with an average size of 70-100 nm were successfully developed and crystalline peaks for the HCP and FCC structure were observed without second phase such as $Co(OH)_2$.
폐(廢)스마트 유리제품(琉璃製品) 재활용(再活用) 현황(現況)과 기술(技術) 전망(展望)
홍현선,조봉규,Hong, Hyun Seon,Cho, Bong-Gyoo 한국자원리싸이클링학회 2013 資源 리싸이클링 Vol.22 No.4
유리소재는 금속과는 다른 세라믹의 특성 때문에 오랜 기간 인류가 지속적으로 사용한 소재로서, 현대에 산업이 고도화되면서 유리소재도 고도화되어 스마트 유리가 개발되어 사용되고 있다. 스마트 유리는 주로 디스플레이, 반도체 등에서 사용되고 있는 고기능성 첨단유리 제품으로, 사용 후 유리 발생량이 계속 증가하고 있는 추세이며 2012년의 경우 적어도 60,000톤 이상의 폐기물이 발생한 것으로 추정된다. 본 고에서는 국내 스마트 유리산업 및 재활용 현황을 살펴보고, 국내의 재활용기술과 향후 전망에 대해 요약 소개하고자 한다. Glass materials possess unique functional characteristics of ceramics different from those of metals, which has marked glass as one of the mainstay materials in the history of mankind. Nowadays, industrial sophistication necessitates comparable "smart" attributes of glass materials as a significantly advanced form of sophistication. Smart glasses are increasingly applied in many state-of-the-art digital appliances such as displays and semiconductors and waste is also expected to accumulate therefrom in the near future: More than 60,000 tons of smart glass wastes were reported as of 2012, for example. In the present paper, current status of domestic Korean smart glass industry and related recycling enterprise have been comprehensively investigated. Finally, Korean domestic smart glass recycling technology and its future prospect are also briefly presented.
MoO<sub>3</sub> 침출공정 폐액으로부터 동분말의 회수기술
홍현선,정항철,김건홍,공만식,Hong, Hyun-Seon,Jung, Hang-Chul,Kim, Geun-Hong,Kong, Man-Sik 한국분말야금학회 2009 한국분말재료학회지 (KPMI) Vol.16 No.5
A two-step recovery method was developed to produce copper powders from copper chloride waste solution as byproducts of MoO$_3$ leaching process. The first step consisted of replacing noble copper ions with external Fe$^{3+}$ ions which were formed by dissolving iron scraps in the copper chloride waste solution. The replaced copper ions were subsequently precipitated as copper powders. The second step was cementation of entire solution mixture to separate (pure) copper powders from aqueous solution of iron chloride. Cementation process variables of temperature, time, and added amount of iron scraps were optimized by using design of experiment method and individual effects on yield and efficiency of copper powder recovery were investigated. Copper powders thus obtained from cementation process were further characterized using various analytical tools such as XRD, SEM-EDS and laser diffraction and scattering methods.Cementation process necessitated further purification of recovered copper powders and centrifugal separation method was employed, which successfully yielded copper powders of more than 99% purity and average 1$\sim$2$\mu$m in size.
알루미나 제조 공정 산출물 레드머드의 재활용 현황과 기술개발 동향 분석
홍현선,김예린,조현정,김대원,김대웅,김형준,김용,김성표,Hong, Hyun-Seon,Kim, Ye-lin,Cho, Hyun-Jung,Kim, Dae-Weon,Kim, Dae-woong,Kim, Hyeong-Jun,Kim, Yong,Kim, Sung-pyo 한국자원리싸이클링학회 2017 資源 리싸이클링 Vol.26 No.5
알루미나 제조공정 부산물인 레드머드는 여러 가지 유용한 자원을 포함하고 있음에도 불구하고 아직까지 재활용되지 않고 있어 환경문제를 야기하고 있다. 현재 우리나라에서 레드머드가 매년 약 20만 톤 이상을 생산하고 있으며 대부분이 야적되고 있는 실정이다. 글로벌하게 보면 최근 중국의 알루미나 생산량이 증가함에 따라 전 세계에서 발생하는 레드머드의 양은 1억 톤 이상으로 꾸준히 증가하고 있다. 레드머드의 재활용 기술은 우리나라를 비롯한 많은 국가에서도 개발되고 있지만, 재활용 및 처리 기술은 여전히 레드머드의 생산증가 속도에 비해 미흡한 실정이다. 본 논문에서는 레드머드와 관련된 특허, 논문, 기술보고서를 내용별 연도별로 분석하였다. 또한 국내 산출 레드머드의 물성 분석을 통해 기초 소재특성 자료를 제공하였고 국내외 레드머드 재활용의 실용화 추진 사례를 분석하여 실용화 기술 개발 가능성을 제시하였다. 특히 레드머드에서 희토류를 회수하는 기술, 환경오염 방지제 기술 등은 수요가 높고 경제적 가치가 높기 때문에 전 세계적으로 개발되고 있는 것으로 파악되었다. 이처럼 본 연구에서 도출된 레드머드의 기술개발 사례 등의 자료는 향후 고부가가치의 실용적 연구 및 기술 개발에 기여할 것으로 판단된다. Red mud generated in the alumina manufacturing process contains various valuable resources, but it is not comprehensively recycled yet causing severe environmental problems. In Korea, red mud is producing about 200,000 tons annually and most of them are landfilled or disposed. Red mud's recycling technology is also being developed in many countries, but red mud's recycling technologies are still lacking compared to the production rate. In this study, we analyzed the characteristics and the amount of red mud, and the current status and technology development trend. Red mud has shown that recycling studies are being carried out in fields such as construction, recycling, metal recovery, adsorbent, and pollution stabilization. In particular, technologies for recovering rare earths have been developed as worldwide because of their high economic value. The data analyzed in this study will be used as basic data for the further development of technologies in the future.
MOCVD 공정 중 발생한 GaN 분말 scrap에 대한 대기 산화가 결정조직과 미세조직에 미치는 영향
홍현선,안중우,Hong, Hyun Seon,Ahn, Joong Woo 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.4
The GaN-powder scrap generated in the manufacturing process of LED contains significant amounts of gallium. This waste can be an important resource for gallium through recycling of scraps. In the present study, the influence of annealing temperatures on the structural properties of GaN powder was investigated when the waste was recycled through the mechanochemical oxidation process. The annealing temperature varied from $200^{\circ}C$ to $1100^{\circ}C$ and the changes in crystal structure and microstructure were studied. The annealed powder was characterized using various analytical tools such as TGA, XRD, SEM, and XRF. The results indicate that GaN structure was fully changed to $Ga_2O_3$ structure when annealed above $900^{\circ}C$ for 2 h. And, as the annealing temperature increased, crystallinity and particle size were enhanced. The increase in particle size of gallium oxide was possibly promoted by powder-sintering which merged particles to larger than 50 nm.
홍현선,고영대,강이승,김건홍,정항철,Hong, Hyun-Seon,Ko, Young-Dae,Kang, Lee-Seung,Kim, Geon-Hong,Jung, Hang-Chul 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.3
Spherical nanosized cobalt powder with an average size of 150-400 nm was successfully prepared at room temperature from cobalt sulfate heptahydrate ($CoSO_4{\cdot}7H_2O$). Wet chemical reduction method was adopted to synthesize nano cobalt powder and hypophosphorous acid ($H_3PO_2$) was used as reduction agent. Both the HCP and the FCC Co phase were developed while $CoSO_4{\cdot}7H_2O$ concentration ranged from 0.7 M to 1.1 M. Secondary phase such as $Co(OH)_2$ and $CO_3O_4$ were also observed. Peaks for the crystalline Co phase having HCP and FCC structure crystallized as increasing the concentration of $H_3PO_2$, indicating that the amount of reduction agent was enough to reduce $Co(OH)_2$. Consequently, a homogeneous Co phase could be developed without second phase when the $H_3PO_2/CoSO_4{\cdot}7H_2O$ ratio exceeded 7.
홍현선(Hong, Hyun-Seon),김종민(Kim, Jong-Min),신석재(Shin, Seock-Jae) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
700 ?C이상의 온도에서 실시되는 고온수전해는 다가오는 수소경제시대의 주요한 수소제조기 술로 주목되고 있다. 이 연구에서는 Ni보다 전기전도도가 우수하고 가격이 저렴한 Cu를 사용하여 고온수 전해 수소극용 Cu/YSZ 복합체를 기계적합금법에 의해 제조하여 미세구조를 관찰하였고 Cu/YSZ를 수소전극으로 한 반전지를 제조하여 수조제조 실험을 실시하였다. Cu/YSZ 복합체는 Cu와 YSZ를 6:4(vol%)의 조성비로 유성밀을 사용하여 400 rpm으로 24시간 동안 실시하여 제조하였다. 고에너지 볼밀 후 500 nm이하의 나노크기의 복합체가 제조되었으며 Cu입자에 YSZ가 고르게 분포되어 있었다. 수은압입법으로 측정한 기공률은 70%이고 기공크기는 평균 0.5 {mu}m으로 미세한 기공으로 이루어져 있었다. 제조된 Cu/YSZ 복합체를 수소전극으로 한 반전지를 제조하여 수소제조 실험을 실시한 결과 Ni/YSZ 전극보다 수소제조 성능이 우수한 것으로 나타났다. Cu의 높은 열팽창계수와 낮은 녹는점을 보완하면 우수한 고온수전해용 전극재료로 사용될 것으로 판단된다.
국내 산출 레드머드에서 스칸듐 회수를 위한 침출 거동 연구
홍현선 ( Hyun Seon Hong ),김미소 ( Mi So Kim ) 한국폐기물자원순환학회 2019 한국폐기물자원순환학회지 Vol.36 No.2
In Korea, more than 200,000 tons of red-mud are produced annually during the aluminum hydroxide manufacturing process. The red-mud produced contains valuable resources, including scandium; however, most of the red-mud is not recycled, causing environmental problems. The aim of this study is to investigate the leaching characteristics of scandium from red-mud produced in Korea. Leaching experiments on domestic red-mud were conducted under varying leaching times, leaching temperatures, liquid-to-solid (L/S) ratios, and acid concentrations. The recovery of scandium was higher when leached in H<sub>2</sub>SO<sub>4</sub> solution compared to HCl solution. Whereas the dissolution of scandium was slightly affected by leaching time and temperature, changes in acid concentrations and liquid-to-solid ratios significantly enhanced the dissolution of scandium by approximately 40%. In 5 M acid solution and an L/S ratio of 10, the maximum dissolution efficiency of scandium was measured to be approximately 89%. The leaching data indicated that scandium dissolution was closely associated with acid concentrations and L/S ratios. This study investigated leaching process characteristics as a pre-treatment process to recover scandium from red-mud scrap. These results could have industrial applications through scaling up.