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용매추출-전해채취법에 의한 망간단괴 매트상 모의 침출용액으로부터 코발트 회수
김현호,남철우,박경호,윤호성,김민석,김철주,박상운,Kim, Hyun-Ho,Nam, Chul-Woo,Park, Kyung-Ho,Yoon, Ho-Sung,Kim, Min-Seuk,Kim, Chul-Joo,Park, Sang-Woon 한국자원리싸이클링학회 2016 資源 리싸이클링 Vol.25 No.2
망간단괴 매트상 모의 침출용액에서 구리 용매추출과 수산화 침전법에 의해 구리와 철이 제거 된 용액(Co 1.91 g/L, Ni 14.65 g/L)으로부터 용매추출-전해채취 연속공정을 통해 코발트를 분리, 회수를 위한 규모확대 실험(망간단괴 기준 380 kg/day)을 수행하였다. 용매추출의 경우 추출제로는 NaOH로 45% 비누화 된 0.22 M Cyanex 272, 세정용액은 코발트 2 g/L(pH : 3.0), 탈거용액은 코발트 전해폐액(Co 36.0 g/L, $Na_2SO_4\;70g/L$, pH : 1.5)을 사용하였으며, 탈거된 유기상은 산과 증류수의 세척 공정을 통해 재사용하였다. 추출단, 세정단 그리고 탈거단의 O/A 비는 각각 1/1.5, 10/1 그리고 1.5/1 이었으며, 산세척과 수세척단의 O/A 비는 각각 1/1, 6/1이었다. 용매추출공정의 코발트의 추출율과 탈거율은 각각 99.8%와 99.88%이었으며 탈거액의 코발트와 니켈의 농도는 각각 40.27 g/L, 4 ppm이었다. 전해액의 pH 조절을 위해 전해폐액 순환 방식을 도입한 전해채취공정은 $0.563A/dm^2$의 전류밀도에서 67.0%의 전류효율을 나타내었으며, 99.963% 순도의 금속 코발트를 얻었다. A scale up tests (380 kg/day) using a continuous solvent extraction and electro-winning system was carried out to separate and recover cobalt from a solution containing 1.91 g/L Co and 14.65 g/L Ni. The solution was obtained during a process including solvent extraction and precipitation stages for removal of Cu and Fe from a synthetic sulfuric acid solution of manganese nodule matte. The optimal condition for solvent extraction was : solvent concentration of 0.22M Na-Cyanex 272 (45% saponified with NaOH) and O:A phase ratios of 1:1.5, 10:1 and 1.5:1 used in extraction, scrubbing and stripping stages, respectively. The extraction and stripping efficiencies were found to be 99.8% and 99.88%, respectively. The stripped solution contained 40.27 g/L Co with 4 ppm Ni. Cobalt metal of 99.963% purity was yielded with current efficiency of 67% and current density of $0.563A/dm^2$ during the electro-winning process.
요추(腰椎) 추간판(椎間板) 탈출증(脫出症)으로 인하여 발생한 소음인(少陰人) 요각통(腰脚痛) 치험 1례
김현호,김은이,김경선,임은철,정경숙,윤형선,Kim, Hyun-Ho,Kim, Eun-Yi,Kim, Kyung-Sun,Lim, Eun-Chul,Jung, Kyung-Suk,Yoon, Hyoung-Seon 사상체질의학회 2004 사상체질의학회지 Vol.16 No.3
1. Objectives The purpose of this study is to give an account of the effects of Korean herbal medicine therapy which is based on the Sasang Constitutional Medicine for the patient who has suffered from low back pain caused by the Herniated Lumbar Disc. 2. Methods Consulting her sungjeong(性情), Chehyungkisang(體形氣像) and QSCCII, we have diagnosed her as Soeumin(少陰人), and have prescribed Hyangbujapalmul-tang(香附子八物湯). 3. Results After the treatment, she felt her symptoms, low back pain, headache, and general condition, improved. 4. Conclusions This paper describes the process of management and changes of symptoms. We hope this paper useful to rehabilitatable treatment for low back pain caused by the Herniated Lumbar Disc through Sasang Constitutional Medicine.
후면 형상에 따른 결정질 실리콘 태양전지의 후면전계 형성 및 특성
김현호,김성탁,박성은,송주용,김영도,탁성주,권순우,윤세왕,손창식,김동환,Kim, Hyun-Ho,Kim, Seong-Tak,Park, Sung-Eun,Song, Joo-Yong,Kim, Young-Do,Tark, Sung-Ju,Kwon, Soon-Woo,Yoon, Se-Wang,Son, Chang-Sik,Kim, Dong-Hwan 한국재료학회 2011 한국재료학회지 Vol.21 No.5
To reduce manufacturing costs of crystalline silicon solar cells, silicon wafers have become thinner. In relation to this, the properties of the aluminium-back surface field (Al-BSF) are considered an important factor in solar cell performance. Generally, screen-printing and a rapid thermal process (RTP) are utilized together to form the Al-BSF. This study evaluates Al-BSF formation on a (111) textured back surface compared with a (100) flat back surface with variation of ramp up rates from 18 to $89^{\circ}C$/s for the RTP annealing conditions. To make different back surface morphologies, one side texturing using a silicon nitride film and double side texturing were carried out. After aluminium screen-printing, Al-BSF formed according to the RTP annealing conditions. A metal etching process in hydrochloric acid solution was carried out to assess the quality of Al-BSF. Saturation currents were calculated by using quasi-steady-state photoconductance. The surface morphologies observed by scanning electron microscopy and a non-contacting optical profiler. Also, sheet resistances and bulk carrier concentration were measured by a 4-point probe and hall measurement system. From the results, a faster ramp up during Al-BSF formation yielded better quality than a slower ramp up process due to temperature uniformity of silicon and the aluminium surface. Also, in the Al-BSF formation process, the (111) textured back surface is significantly affected by the ramp up rates compared with the (100) flat back surface.
망간단괴 매트상 모의 침출용액으로부터 용매추출-전해채취 공정에 의한 구리의 회수
김현호,박경호,남철우,윤호성,김민석,김철주,박상운,Kim, Hyun-Ho,Park, Kyung-Ho,Nam, Chul-Woo,Yoon, Ho-Sung,Kim, Min-Seuk,Kim, Chul-Joo,Park, Sang-Woon 한국자원리싸이클링학회 2016 資源 리싸이클링 Vol.25 No.1
망간단괴 매트상 침출액 조성으로 제조 된 모의 용액(Cu 10.5 g/L, Co 2.0 g/L, Ni 15.0 g/L, Fe 0.2 g/L)으로부터 용매추출-전해채취 연속공정을 통해 구리를 분리-회수하기 위하여 규모 확대용 용매추출장치인 6단 혼합-침강기(mixer-settler : 추출 4단, 탈거 2단)와 전해조를 이용하였다. 용매추출의 경우 추출제로는 40%(v/v)의 LIX 84I, 탈거용액은 전해폐액(Cu 35.0 g/L, $H_2SO_4$ 180 g/L)을 사용하였으며 추출단과 탈거단의 O/A 비는 각각 1/1과 1.5/1 이었다. 용매추출공정의 구리의 추출율과 탈거율은 각각 96.7%와 91.0%이었으며 탈거액(전해액)의 구리, 니켈, 코발트 그리고 철의 농도는 각각 50~51 g/L, 25 ppm, 5 ppm 그리고 3 ppm 이었다. 전해채취공정은 $1.50A/dm^2$의 전류밀도에서 98.9%의 전류효율을 나타내었으며, 99.833% 순도의 금속 구리를 얻었다. A scale-up test with a continuous solvent extraction and electro-winning system was carried out to separate and recover copper from a synthetic sulfuric acid solution (Cu 10.5 g/L, Co 2.0 g/L, Ni 15.0 g/L, Fe 0.2 g/L). The solution was introduced into mixer-settlers with four stages of extraction and two stages of stripping for continuous countercurrent solvent extraction to separate copper from nickel and cobalt. The loading was carried out using 40% LIX 84-I(v/v) as extractant with a phase ratio of A : O = 1 : 1. Meanwhile, the stripping was undertaken at a phase ratio of A : O = 1 : 1.5 using depleted electrolyte containing 35.0 g/L Cu and 180 g/L $H_2SO_4$ as stripping solution. The extraction and stripping efficiencies were found to be 96.7% and 91.0%, respectively. The copper composition of the stripped solution (pregnant electrolyte) was 50.0 g/L Cu with impurities of 25 ppm nickel, 5 ppm cobalt and 3 ppm iron. In the electro-winning process, copper metal of 99.833 purity was yielded with current efficiency of 98.9% and current density of $1.50A/dm^2$.