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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.
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.
산업폐수의 총유기탄소(TOC) 특성 - 전남 동부권 사업장을 중심으로 -
박보영 ( Bo-young Park ),문희 ( Hee Moon ),허동화 ( Dong-hwa Heo ),전수인 ( Su-in Jeon ),신혜정 ( Hea-jung Sin ),박송인 ( Song-in Park ),김양기 ( Yang-gi Kim ) 한국환경기술학회 2022 한국환경기술학회지 Vol.23 No.6
TOC was applied to the effluent new standard as a substitute of COD<sub>Mn</sub>. But the setting of the TOC did not reflect the characteristics of various wastewater, such as the treatment facility size and the discharge type. This study assessed each industrial facility in terms of water quality characteristics by replacing COD<sub>Mn</sub> with TOC. In the study, 96 data groups across ten industrial categories based on the Korean Standard Industrial Classification were measured COD<sub>Mn</sub> and TOC to obtain data about waste water discharge facilities in the eastern parts of Jeollanam-do province. The measurements show that the mean COD<sub>Mn</sub> and TOC concentration were in the ranges of 4.2 mg/L ∼ 82.0 mg/L and 3.7 mg/L ∼ 195.4 mg/L, respectively. The relative ratio(COD<sub>Mn</sub>/TOC) was 0.42 ∼ 1.50 and the oxidation rate of COD<sub>Mn</sub> was 12.69 % ∼ 45.45 %. The TOC emission rate against the acceptable emission criteria was in the range of 7.73 % ∼ 100.72 %. The result of TOC and COD<sub>Mn</sub> was 82.0 mg/L and 195.4 mg/L in other food manufacturing facilities, 8.5 mg/L and 14.2 mg/L in basic petrochemical compound manufacturing facilities, 24.8 mg/L and 25.7 mg/L in transportation equipment repair and car washing or cleaning facilities. Correlations among different organic matters were analyzed according to business categories, and the results show a range of 0.9813 ∼ 0.3742, which points to huge differences among business categories. In addition, the study examined 10 items in 4 Establishments, whose wastewater discharge was less than 200 m3. The result showed that their organic matter discharges had been underestimated as they were in the food industry. These results raise a concern with the possibilities of their exceeding the criteria in case of TOC application and a need for them to improve their processes and consequently change their management methods.