질산 Etching 폐액으로부터 용매추출법에 의한 질산의 회수에 관한 연구

안재우 한국자원리싸이클링학회 1998 資源 리싸이클링 Vol.7 No.5

질산계 에칭폐액으로부터 질산과 유가금속을 분리하여 재활용하기 위하여 용매추출법을 이용하여 질산성분을 회수하기 위한 기초 연구를 수행하였다. 주요 실험내용으로는 추출제의 종류와 농도에 따라 질산의 추출거동을 조사하였고, 질산의 추출시 구리, 납, 철, 주석 등의 금속이온들과의 분리성을 고찰하였다. 또한 McCabe-Thiele 그림으로부터 질산성분을 추출과 탈거에 필요한 이론적인 단수를 분석하였다. 실험 결과 TBP가 Alamine336에 비하여 질산의 회수에는 유리하였으며 TBP는 유기상의 60∼70%가 적합하였으며 폐액상의 질산농도가 0.1N 이상인 경우에는 각 금속성분들이 추출되지 않았으며 60%TBP를 사용하여 O/A비가 3인 경우 5단으로 95%이상의 질산이 추출되었다. 한편, 질산이 추출된 유기상으로부터 탈거 실험의 경우 초기농도가 80 g/l일 때 증류수에 의해 O/A비가 2에서 4단으로 98%이상의 탈거율을 나타내었다. A study has been on the recovery of nitric acid and valuable metals such as Fe, Cu, Sn, Pb, from spent nitric etching solutions. The effects of extractant of extractant type, concentrations, phase raios and selectivity from Fe, Cu, Sn, Pb on nitric acid extraction were studied. The results showed that TBP as an extractant for recovering of nitric acid was more effective than Alamine336, and the optimal concentration of TBP was found to be 60~70% of organic phase. Also, the nitric acid were only extracted by TBP from the spent etching solutions and the heavy metals such as Fe, Cu, Sn, Pb were not extracted above 0.1N nitric acid in spent etching solutions, From the analysis of McCabe-Thiele diagram, the extraction of 95% nitric acid is attained at a ratio of O/A=3 with five stages by 60% TBP and the stripping of 98% nitric acid from 80 g/l nitric acid in organic phase is attained at a ratio of O/A=1 with four stages by distilled water.

Subcorneal Pustular Dermatosis 1예

안재우,송해준,오칠환,전지현 대한피부과학회 2015 大韓皮膚科學會誌 Vol.53 No.5

Ni-Zn-P 및 Fe-Zn-P 3원계 합금도금에 관한 헐셀 실험 연구

안재우,안종관 대진대학교 1995 大眞論叢 Vol.3 No.-

A experimental study on the electrodeposition of Ni-Zn-P and Fe-Zn-P alloy onto a steel has been carried out using a Hull-cell apparatus. The results show that the optinum current efficency of Ni-Zn-P and Fe-Zn-P alloy was 80mA/cm^(2), 120mA/cm^(2) respectively. And the desirable cell distance of Ni-Zn-P and Fe-Zn-P alloy was 6cm, 6.5cm. For the alloying of P, it was obtained that the optimum concentration of NaH_(2)PO_(2) was 20 g/ℓ.

금속파면의 프랙탈적 해석

안재우,전채홍,안종관 대진대학교 1997 大眞論叢 Vol.5 No.-

In the fracture of materials, the art of fractography is well established. However there are few quantitative rules that related the morphology of the fracture surface to the properties of the material, particularly its resistance to fracture, or to the circumstances of the fracture, sudden and catastrophic, or gradual by fatigue, etc. Fractal geometry is used in order to these quantitative relation. Fracture surface is expressed by the fractal. The fractal dimension is related to the special feature of microstructure. And fracture profiles that are generated by midpoint displacement method are in aggrement with the measured profiles.

소아 및 성인 천식 유병률 파악을 위한 델파이법을 활용한 표준조사서 개발

안재우,이경석,김진택,양현종,조유숙,장광천,송우정,권혁수,윤종서,한만용 대한 소아알레르기 호흡기학회 2018 Allergy Asthma & Respiratory Disease Vol.6 No.1

Purpose: Recently, the prevalence and disease burden of asthma have increased. Thus, the need for early diagnosis and appropriate management of asthma is emerging. However, it is difficult to identify the diagnosis, symptoms and the prevalence of asthma due to lack of reliable investigating items. The purpose of this study was to develop a standardized survey format in order to assess the prevalence of asthma in Koreans. Methods: We investigated surveys and related information that are utilized to assess asthma diagnosis and prevalence by systematic review. After that, Delphi survey was conducted on 44 Korean allergists in order to develop a standardized survey in Korea. The process consisted of 3 serial rounds across 3 age groups. Each subsequent round narrowed investigating items for the decision of standard set about asthma prevalence, current asthma, and asthma aggravation. Results: Lifetime asthma was defined as “ever doctor-diagnosed asthma” in all age groups. Current asthma was defined as “treatment for asthma during the past 12 months” in all age groups, and “doctor-diagnosed asthma during the past 12 months” was added on the ≥5-year-old and adult groups. “Wheezing ever” was defined as “wheezing at any time in the past,” and current wheeze was defined as “wheezing in the last 12 months.” Asthma aggravation was defined as “visits at the emergency department or admission due to asthma attack within the last 12 months” in all age groups. Conclusion: We established applicable nationwide definitions of “lifetime asthma,” “current asthma,” and “asthma aggravation” in Koreans by the Delphi survey.

The Non-Eco-Friendly Drive : Understanding South Korea’s Post-Dieselgate Volkswagen Sales

안재우 한국생태환경사학회 2016 생태환경과역사 Vol.- No.2

This study is an observation on the unusual post-dieselgate Volkswagen sales in South Korea, through the magnifying glasses of the humanities and social sciences. An analysis on the causality behind the country’s general utility function with regard to Volkswagen’s automobiles has been conducted by applying the theories of Pierre Bourdieu, Ivan Illich and Edward Said.

전자(電子)스크랩에서 구리 및 주석의 회수(回收)를 위한 질산(窒酸) 침출(浸出) 및 침출액(浸出液)에서 유리질산(遊離窒酸) 제거(除去) 연구(硏究)

안재우,서재성,Ahn, Jae-Woo,Seo, Jae-Seong 한국자원리싸이클링학회 2009 資源 리싸이클링 Vol.18 No.5

Fundamental study has been made on the recovery of copper from the electronic scrap by hydrometallurgical process. Nitric acid was used as a leaching agent to dissolve the metals such as Cu, Sn, Pb, Fe etc. from the crushed electronic scraps. TBP was employed to extract nitric acid from the strong nitric acid leaching solutions and to reclaim nitric acid. From the experimental results, Cu was effectively leached by 3.0-4.0 M nitric acid. And 95% of nitric acid in the leaching solution was extracted by 60% TBP, and 98% of nitric acid was stripped from the loaded organic phase by distilled water and it was possible to reuse as a leaching agent. 전자스크랩중에 함유된 구리 및 주석을 습식공정으로 회수하기 위하여 기초 연구를 실시하였다. 침출제로 질산을 이용하여 분쇄된 전자스크랩에서 구리, 주석, 납, 철 등의 금속 성분들에 대한 침출율을 조사하고 최적 침출조건을 제시 하였다. 이러한 질산 침출 용액으로부터 TBP를 이용하여 유리질산을 분리 추출하여 재활용하기 위한 기초 연구를 실시하였다. 실험 결과 3.0-4.0 M 질산으로 구리를 효과적으로 침출시킬 수 있었으며, 질산 침출액 중 유리질산을 60% TBP에 의해 95%정도 추출이 가능하였고, 유기상에 추출된 질산의 98%를 증류수에 의해 탈거하여 질산침출액으로 재사용이 가능하였다.

Mixer-Settler를 이용한 연속공정에 의한 니켈과 코발트의 추출

안재우,안종관,이만승 대진대학교 첨단소재연구소 2001 첨단소재연구소논문집 Vol.4 No.-

Extraction behaviors of Co and Ni in hydrochloric acid solutions by Alamine336(Teritary amine) have been investigated in mixer-settler. The feeding aqueous solution contained 5.0g/L nickel and 0.7g/I, Co in 5.0M hydrochliric acid solution. The organic phase being used for extractant comprised 20 vol. % Alamine336(Teritary amine) in Xylene. The 10 mixer-settler units of count current type consist of 3 extraction, 2 scrubbing, 3 stripping and 2 washing sections. The extraction percent of Co was 99 % but Ni was not extracted during 3 steps. Ni co-extracted with co was removed in 2 steps of scrubbing section by 6M hydrochloric acid solution from organic phase. Over 92% of Co from organic phase was stripped by 0.1M hydrochloric acid solution in 2 volume ratio of organic and aqueous phase. After stripping, the organic phase that was washed by 3.0 M hydrochloric acid solution in 2 volume ratio of organic and aqueous phase could be recycled for the organic solution.

염산에칭폐액으로부터 Alamine336에 의한 구리의 용매추출에 관한 연구

안재우,염재웅 한국자원리싸이클링학회 1997 資源 리싸이클링 Vol.6 No.3

염산계 에칭폐액으로부터 추출제로 Alamine336(Tri-n-octylamine)을 이용하여 용매추출법에 의해 구리를 회수하기 위한 연구를 행하였다. 주요 실험변수로는 염산농도 및 염소이온농도, 추출제의 농도, 유기상과 수용액상(폐액상)의 상비 등 구리이온의 추출에 영향을 미칠 수 있는 인자들에 대하여 실험을 하엿는데, 이 실험결과 추출제의 농도 및 상비가 구리의 추출에 큰영향을 미침을 알 수 있었고 또한 수용액상의 염산 및 염소이온의 농도가 증가할수록 구리의 추출률이 증가하였다. 한편 McCabe-Thiele diagram으로부터 구리성분의 연속추출공정에 필요한 이론적인 추출단수를 결정하였다. 유기상으로 추출된 구리성분은 탈거제로 물($H_2$O)을 사용함으로써 효율적으로 탈거가 가능하였고 탈거제의 온도가 증가할수록 구리성분의 탈거율은 증가하였다. A study has been made of the rccovery of copper (11) by solvent extraction with Alamine336 (Tri-n-oclylamine) as a extractant from hydrochloric etching solutions. The effect of extractant concentrations, hydrochloric acid, chloride Ion concentrations and phase ratio (organiclaqueaus) on copper extraction were studied. Experimental results showed that the concenl~atiano f extractant and the phase ratio strongly influenced the copper extraction, and the extraction percent of capper Increased at higher hydrochloric acid and chloride ion mncmhation. We proposed that the optimum extrachon stages of copper for continuous extraction process by analysidng thc McCabe-Thielc diagram. Stripping of copper from the loaded organic phases wn be accomplished by pure water (H, O) as a dripping reagent effectively. As the tcmpcrature is increased, thc stripping of copper is enhanced.

New record of Ulva sublittoralis (Ulvales, Chlorophyta) in Korea

안재우,강필준,남기완 한국환경생물학회 2019 환경생물 : 환경생물학회지 Vol.37 No.3

A marine ulvalean species (Chlorophyta) was collected from the eastern coast of Korea. This species is morphologically characterized by a distromatic, dark to medium green and mostly irregularly orbicular or irregularly expanded thallus with entire or undulate margin without serrations. Vegetative cells are irregularly polygonal with distinctly rounded corners in shape, and have chloroplast completely covering the outer cell wall and one to two pyrenoids per cell. In a phylogenetic tree based on ITS (Internal Transcribed Spacer) sequences, this Korean alga nests in the same clade with Ulva sublittoralis, as a sister clade of U. californica, U. flexuosa and U. tanneri, which share the irregularly orbicular or expanded thallus normally without teeth cells. The genetic divergence between them is intraspecific within Ulva. Accordingly, it is identified as U. sublittoralis based on the morphological and molecular data. This is the first record of Ulva sublittoralis in the Korean marine algal flora.