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An investigation of the properties of Cu-Be-x alloys prepared by horizontal continuous casting
홍현선,Man Sik Kong,Neung-Mo Sung,Seung Yun Lee,Kyung Min Kim 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.3
The effects of the solid solution and aging treatment on the microstructure, hardness and electrical conductivity of Cu alloys containing 0.7 wt% and 1.8 wt% Be were investigated. These Cu-Be alloys contain Co, Si, Ni and Mn as alloying elements. An horizontal continuous casting process was applied to obtain unidirectionally solidified billets. A solid solution treatment of the sample was carried out at 865 oC and aging treatments were performed in the range 270-550 oC. For the Cu-1.8 wt% Be alloys, the electrical conductivity generally increased as the aging temperature increased in the range of 270-370 oC. For the Cu-0.7 wt% Be alloys, the electrical conductivity increased as the aging time increased in the range of 10-180 min. The effects of the solid solution and aging treatment on the microstructure, hardness and electrical conductivity of Cu alloys containing 0.7 wt% and 1.8 wt% Be were investigated. These Cu-Be alloys contain Co, Si, Ni and Mn as alloying elements. An horizontal continuous casting process was applied to obtain unidirectionally solidified billets. A solid solution treatment of the sample was carried out at 865 oC and aging treatments were performed in the range 270-550 oC. For the Cu-1.8 wt% Be alloys, the electrical conductivity generally increased as the aging temperature increased in the range of 270-370 oC. For the Cu-0.7 wt% Be alloys, the electrical conductivity increased as the aging time increased in the range of 10-180 min.
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.
홍현선,김율이,오민주,이유미,이혜지,차은서 한국폐기물자원순환학회 2018 한국폐기물자원순환학회지 Vol.35 No.7
The coffee grounds generated during the coffee extraction process contain several resources, but the technology for their recycling has not been commercialized yet, causing various environmental problems. Due to the recent increase in coffee consumption worldwide, the amount of coffee grounds produced has been continuously increasing, reaching more than 750 million tons. In Korea, about 120,000 tons of coffee waste are annually generated; however, most of them are landfilled or incinerated. Although there is still a shortage of coffee waste recycling technologies compared to the amount of coffee grounds produced, various recycling approaches are being actuated in many countries including Korea. In this study, the generation of coffee grounds at home and abroad, the status of coffee grounds recycling, and the associated technology development trends were investigated. The coffee grounds recycling has been studied in the fields of energy, adsorbent, construction, agriculture, and bio-foods. Research is most active in the energy and biotechnology areas; in particular, since the oil in the coffee grounds is valuable as a feedstock for biomass energy, the technology related to energy recovery is currently under development worldwide. Removed because confusing and unnecessary.