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폐 영구자석으로부터 회수한 염화희토류용액에서 PC88A를 이용한 경희토류(Pr, Nd)/중희토류(Tb, Dy) 용매추출
전수병,손인준,임병철,김정모,김연진,하태규,윤호성,김철주,정경우,Jeon, Su-Byung,Son, InJoon,Lim, Byung-Chul,Kim, Jeong-Mo,Kim, Yeon-Jin,Ha, Tae-Gyu,Yoon, Ho-Sung,Kim, Chul-Joo,Chung, Kyeong-Woo 한국자원리싸이클링학회 2018 資源 리싸이클링 Vol.27 No.3
Solvent extraction behavior of light rare earth elements (Pr, Nd) and medium rare erath elements (Tb, Dy) in the HCl-PC88A-kerosene extraction system was investigated in order to separate high-purity light rare earths (Pr, Nd) and medium rare earths (Tb, Dy) in the mixed rare earth chloride solution. In the batch test step, it was confirmed that the separation efficiency was good when the extractant concentration (PC88A) was 0.5 M, the equilibrium pH after extraction was 0.8 to 1.0 (initial pH 1.3 of the feed), the concentrations of hydrochloric acid in scrubbing solution was set as 0.1 M, the concentrations of hydrochloric acid in stripping solution was set as 2.0 M or more. Based on the experimental data obtained from the batch test, the mixer-settler was composed as follows; 4 stages of extraction, 8 stages of scrubbing, 4 stages of stripping, and 3 stages of pickling organic solution. The Mixer-settler was operated for 180 hours, and the operating conditions were continuously adjusted to obtain the high-purity light/medium rare earths. Finally, the purity of light (Pr, Nd) and medium rare earth elements (Tb, Dy) was reached as 3 N class.
전기 아연도금용 유색 크로메이트에 대한 건조 온도의 영향
전수병,최지원,손병기,손인준 한국표면공학회 2023 한국표면공학회지 Vol.56 No.5
In this study, the effect of drying temperature on characteristics of the trivalent chromate film on electroplated zinc was investigated. An zinc-electroplated iron specimen with a thickness of 5 μm was used for chromate treatment. Chromate treatment was conducted in a solution diluted 10 times from a mixture of Cr(NO3)3∙9H20 360 g/L, Co(NO3)2∙6H2O 60 g/L, Na2SO4 60 g/L, NH4F∙HF 25 g/L, and NaOH 20 g/L. The zinc electroplated specimen was treated using the chromate solution with pH 2.0 at 25 ℃ for 60 s. Subsequently, chromate-treated samples were dried in an electric furnace for 2h with temperature varied from 25 to 125 ℃. The corrosion rate increased with the increase in the drying temperature, and the surface morphology of the chromate-treated film was observed using FE-SEM. When the drying temperature changed, the color of the chromate film changed from green to yellow, and the thickness of the film changed from 362 to 241 nm, respectively. Additionally, corrosion resistance was evaluated via a salt spray test.
田壽炳 大田大學校 1982 論文集 Vol.1 No.1
Kim Tack-Young (1850∼1927) lived at a turning point and testing period in Korean history. In his childhood, the power of the Andong Kim's caused social unrest and the prime of his life the Government carried out an open door. As a result, alien civilization was introduced and the power of foreign countries infiltrated Korea. During this changing situation many intellectuals were confronted with a confict between new and the old ideas. In his old are he witnessed the loss of the power of the state by the Japanese annexation. In consequence he lived in disorderly period. Kim Tack-young was an authority on the Chinese classic and was a historian who took interest in Korean history. For that reason the auther thinks it a work of profound significance to study the inclination of his learning and his thoughts about history. First, the inclination of his learning showed a tendency resulting from his interest in Chinese literature, in which he was wellversed. While on the one hand he did not like oriental philosophy, namely, Sung confucianism and doctrines of wang Yang-Ming, he paid regard to confucianism. Despite the fact that he knew the excellency of occidental civilization, he neither admired nor criticized it. From this one may assume that he must have been a moderate and a conservative. Therefore, the auther thinks it an error that a few historians regard him as a pioneer of the patriotic enlightment movement. Second, his thoughts on history are as follows. 1) He described history in chronological order. 2) He advocated the theory of Mahan's orthodoxy in ancient Korean history. 3) He wrote methodological essays rather than moral essays on historical as a result of the influence of the positivist school. 4) He attached great importance to history of palhae. 5) He viewed the clan rather than nationality as being most important. 6) He was the first to use the epitaph of king Kwanggaeto in writing history. In conclution, Kim Tack-Young's thoughts on history did not lead the nation and the people because of his confucian inclination in learrning and his conservative view of history, therefore his thoughts did not survive, but he dedieated his life to writing history and arranged the history of the Yi Dynasty for the first time and broke from the conservative style of writing historical essays. when auther thinks about his status and a role among Korean historians, Kim Tack-Young was the last conservative historian and the first enlightened historian.
네오디뮴 자석 스크랩에서 희토류 원소 선택적 침출 신공정 기술
김철주 ( Chul-joo Kim ),윤호성 ( Ho-sung Yoon ),정경우 ( Kyeong Woo Chung ),임병철 ( Byung-chul Lim ),김정모 ( Jeong-mo Kim ),전수병 ( Su-byung Jeon ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2018 No.-
네오디뮴 자석(Nd<sub>2</sub>Fe<sub>14</sub>B)의 가공·성형시 다량의 스크랩이 발생하는데 발생량이 투입되는 양의 최대 40%를 나타내어 경제적·환경적 측면에서 발생 스크랩의 재활용은 필수적이다. 가공스크랩은 폐자석과는 달리 분말형태로 수집되어 파/분쇄 단계가 필요치 않은 장점이 있으며, 또한, 가공 단계에서 투입된 절삭유에 의해 산소와의 접촉이 억제되어 산화가 발생되지 않은 금속 상태로 존재한다는 특징을 갖고 있다. 이에 본 연구에서는 NaOH 침지후 산화배소 공정을 적용하여 네오디뮴 자석 스크랩의을 직접 산화시킬 시 나타나는 희토류-철 혼합산화물(NdFeO<sub>3</sub>)의 생성을 억제하고 희토류 산화물(Nd<sub>2</sub>O<sub>3</sub>)와 철산화물(Fe<sub>2</sub>O<sub>3</sub>)를 분리 생성시킴으로서 침출단계에서 철의 침출은 억제하고 희토류만을 선택적으로 침출시켜 향후 희토류 분리정제 및 고순도화 단계에서 희토류/비희토류 분리정제 단계를 생략하고 바로 용매추출에 의한 희토류 고순도화 공정으로의 적용이 가능한 신공정 연구를 수행하였다.