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하용황(Ha, Yonghwang),강윤지(Gang, Ryun-Ji),손성호(Son, Seong-Ho),이원식(Lee, Wonsik),안종관(Ahn, Jong-Gwan) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.11
자동차용 고광택 크롬 도금 박리액에는 질산과 유가금속인 구리가 다량 함유되어 있는 것으로 알려져 있다. 질산(HNO₃) 및 유가금속은 고가이며 유독하므로, 경제 및 환경을 고려하여 반드시 회수하여 재활용하여야 한다. 본 연구에서는 도금박리액으로부터 질산과 구리는 용매 추출법을 이용하여 후 분리하였다. 수상에 존재하는 질산의 농도는 0.01 ~ 1N NaOH를 이용하여 적정하여 분석하고, 금속의 농도는 ICP-MS 및 ICP-AES 등을 이용 하여 분석하였다. 도금 박리액을 분석한 결과, 구리 이온은 76,850 mg/L이 함유되어 있음을 알 수 있었다. 용액 내 질산의 양을 NaOH 용액을 이용하여 적정법으로 측정하였을 때 대략 1.02 M 임을 알 수 있었다. 50% Tributylphosphate (TBP)를 이용하여 3단 추출한 유기층의 용액을 증류수를 이용하여 각각 3회의 역추출을 하였을 때, 원액으로부터 48.1%의 질산을 회수할 수 있음을 알 수 있었으며, 순도는 99.9% 이상이었다. 질산 회수 후, 용 액 내에 남은 구리는 PC 88A, D2EPHA, LIX 84 및 ISE 106을 이용하여 용매추출 하였으며, 각 용매의 추출률을 비교하였을 때, ISE 106의 경우, 1단 추출 후 30% 황산으로 역세척 하였을 경우, 92%의 구리를 회수할 수 있었 다. 추출된 구리는 N2H<sub>4</sub>를 이용하여 환원시켰고, 다양한 조건 하에서 구리 분말을 제조하였다. It has been known that there are large amount of nitric acid and valuable metals, copper in the plating waste solution of automobile wheel. As nitric acid and valuable metals are high price and toxic, they should be recovered for economics and environment. Plating waste was extracted with TBP diluted with kerosene. The concentration of nitric acid in aqueous phase was analyzed by titration method by NaOH solution (0.1∼1.0N) and the amount of metals by ICP-MS and ICP-AES. The concentration of copper in plating waste were 76,850 mg/L. The concentration of nitric acid in plating waste was 1.02 M. After three step extraction was performed with 50% TBP, each organic phase was stripped three times with distilled water to obtain 48.1% of nitric acid. Purity of final nitric acid was over 99.9% by ICP analysis. After recovery of nitric acid, copper was extracted with various solvent extractors like PC 88A, D2EPHA, LIX 84 and ISE 106. Among these extractors, 92% of copper was recovered by ISE 106 after 1st extraction and 30% H<sub>2</sub>SO₄ stripping. Copper ion was reduced with N<sub>2</sub>H<sub>4</sub> to make metal powders, respectively.
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네오디뮴 폐자석 재활용을 위한 화학환원법을 이용한 철 나노 분말 제조
하용황(Ha, Yonghwang),강윤지(Gang, Ryun-Ji),최승훈(Choi, Seung-Hoon),윤호성(Yoon, Ho-Sung),안종관(Ahn, Jong-Gwan) 한국산학기술학회 2012 한국산학기술학회논문지 Vol.13 No.12
네오디뮴 폐자석 침출액으로부터 희유금속인 네오디뮴을 회수하기 위해서는 네오디뮴과 같이 침출되는 철 의 부가가치를 높이는 연구가 필요하다. 본 연구에서는 네오디뮴과 같이 침출되는 철의 유용자원화를 위한 기초연 구로 철 나노분말 제조하는 실험을 수행하였다. 본 연구는 FeCl<sub>3</sub> 용액을 철 분말 원료로, 분산제는 Na<sub>4</sub>O<sub>7</sub>P<sub>2</sub>와 Polyvinylpyrrolidone를 이용하였고, 환원제로는 NaBH<sub>4</sub>, 철 나노분말 핵생성 촉진제 시드(seed)로 염화팔라듐을 사용 하였다. 제조한 철 나노분말을 XRD, 전자현미경(SEM) 및 PSA 등을 이용하여 분말의 형상 및 크기 등을 분석하였다. 철과 NaBH<sub>4</sub>의 농도비가 1 : 5이며, 반응시간이 30분 이상인 경우에서 철 분말이 제조되었으며, 이때 철 분말은 구형 이었으며, 입도는 약 50 nm ~ 100 nm 크기였다. 분산제 Na<sub>4</sub>O<sub>7</sub>P<sub>2</sub>의 경우 100 mg/L에서 철이온의 제타포텐셜이 음의 값을 가지므로 100 mg/L로 일정하게 하고, PVP와 Pd의 농도를 다양하게 하였을 경우, FeCl<sub>3</sub>와 PVP와 Pd의 질량비 1 : 4 및 1 : 0.001에서, 분산이 양호하고, 입도 100 nm 크기인 철 나노분말을 합성하였다. Recycling process of iron should be developed for efficient recovery of neodymium(Nd), rare metal, from acid-leaching solution of neodymium magnet. In this study, FeCl<sub>3</sub> solution as iron source was used for synthesis of iron nanoparticle with the condition of various factors, etc, reductant, surfactant. Na<sub>4</sub>O<sub>7</sub>P<sub>2</sub> and polyvinylpyrrolidone(PVP) as surfactants, NaBH<sub>4</sub> as reductant, and palladium chloride(PdCl<sub>2</sub>) as a nucleation seed were used. Iron powder was analyzed with instruments of XRD, SEM and PSA for measuring shape and size. Iron nanoparticles were made at the ratio of 1 : 5(Fe (III) : NaBH<sub>4</sub>) after 30 min of reduction time. Size and shape of iron particles synthesized were round-form and 50 nm ~ 100 nm size. Zeta-potential of iron at the 100 mg/L of Na<sub>4</sub>O<sub>7</sub>P<sub>2</sub> was negative value, which is good for dispersion of metal particle. When Na<sub>4</sub>O<sub>7</sub>P<sub>2</sub>(100 mg/L), PVP(FeCl<sub>3</sub> : PVP = 1 : 4, w/w) and Pd(FeCl<sub>3</sub> : PdCl<sub>2</sub> = 1 : 0.001, w/w) were used, iron nanoparticles which are round-shape, well-dispersed, near 100 nm-sized can be made.
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2009 Historical Consideration of Hanji Used as Art Materials
Ji-Young Lee,Chul-Hwan Kim,Young-Rok Lee,Gyeong-Gil Baek,Hee-Jin Lee,Hye-Jung Gwak,Sung-Ho Kim,Ha-Ryun Gang 한국가구학회 2009 한국가구학회지 Vol.20 No.3
Traditional Korean paper called Hanji using bast fibers from mulberry tree is made through complicated handmade works. This made Hanji very strong and exceedingly durable. Therefore it is said to last a thousand years. Such incomparable features of Hanji come from the unique sheet forming method called ouibalttugi using a bamboo screen. Excellent physical properties of Hanji reflect the wide variety of use, all central to everyday life. Despite its Excellency, the papermaking practice of traditional handmade paper, Hanji, from Korea is little known outside its country. This might be due to public apathy on Hanji in modern times. Without future apprentices dedicated to the craft, the Korean tradition able to make its soul is in danger of extinction in its homeland. Therefore more concern and more affection on Hanji is required immediately. It must be kept in mind that Hanji is our cultural heritage in pride over time.
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2009 Historical Consideration of Hanji Used as Art Materials
Lee, Ji-Young,Kim, Chul-Hwan,Lee, Young-Rok,Baek, Gyeong-Gil,Lee, Hee-Jin,Gwak, Hye-Jung,Kim, Sung-Ho,Gang, Ha-Ryun Korea Furniture Society 2009 한국가구학회지 Vol.20 No.3
Traditional Korean paper called Hanji using bast fibers from mulberry tree is made through complicated handmade works. This made Hanji very strong and exceedingly durable. Therefore it is said to last a thousand years. Such incomparable features of Hanji come from the unique sheet forming method called ouibalttugi using a bamboo screen. Excellent physical properties of Hanji reflect the wide variety of use, all central to everyday life. Despite its Excellency, the papermaking practice of traditional handmade paper, Hanji, from Korea is little known outside its country. This might be due to public apathy on Hanji in modern times. Without future apprentices dedicated to the craft, the Korean tradition able to make its soul is in danger of extinction in its homeland. Therefore more concern and more affection on Hanji is required immediately. It must be kept in mind that Hanji is our cultural heritage in pride over time.
ScienceON
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