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A Study to Recover Si from End-of-Life Solar Cells using Ultrasonic Cleaning Method
이동헌,고민석,왕제필,Lee, Dong-Hun,Go, Min-Seok,Wang, Jei-Pil The Korean Institute of Resources Recycling 2021 資源 리싸이클링 Vol.30 No.5
In this study, we determine the optimal process conditions for selectively recovering Si from a solar cell surface by removal of impurities (Al, Zn, Ag, etc.). To selectively recover Si from solar cells, leaching is performed using HCl solution and an ultrasonic cleaner. After leaching, the solar cells are washed using distilled water and dried in an oven. Decompression filtration is performed on the HCl solution, and ICP-OES (Inductively Coupled Plasma Optical Emission spectroscopy) full scan analysis is performed on the filtered solution. Furthermore, XRD (X-ray powder diffraction), XRF (X-ray fluorescence), and ICP-OES are performed on the dried solar cells after crushing, and the purity and recovery rate of Si are obtained. In this experiment, the concentration of acid solution, reaction temperature, reaction time, and ultrasonic intensity are considered as variables. The results show that the optimal process conditions for the selective recovery of Si from the solar cells are as follows: the concentration of acid solution = 3 M HCl, reaction temperature = 60℃, reaction time = 120 min, and ultrasonic intensity = 150 W. Further, the Si purity and recovery rate are 99.85 and 99.24%, respectively.
기력 저하 및 현기증을 동반한 소화불량 환자에 대한 한의학 치료 1례
권태하,김민주,고민석,봉세영,이차영,Kwon, Tae-ha,Kim, Min-joo,Go, Min-seok,Bong, Sae-young,Lee, Cha-young 대한한방내과학회 2022 大韓韓方內科學會誌 Vol.43 No.5
Objectives: The aim of this case report was to present the effects of Korean medicine treatment on a patient with dyspepsia symptoms like those of gastroesophageal reflux disease. Methods: A 64-year-old male patient with dyspepsia was treated with Sosiho-tang decoction, Banhasasim-tang soft extract, Gamihyangsayukgunja-tang decoction, and Kracie Sihogayonggolmoryu-tang extract, along with acupuncture, pharmacopuncture, and deep tissue meridian hot pack therapy for five days of hospitalization. Pain from the dyspepsia was assessed using the Numerical Rating Scale and the European Quality of Life 5 Dimensions Scale. Results: Within five days of treatment, dyspepsia was relieved from a Numerical Rating Scale score of 7 to a score of 3. The European Quality of Life 5 Dimensions Scale score increased from 0.455 to 0.816. Conclusion: These results show that dyspepsia can be relieved with Korean medicine treatment. However, further well-designed studies are required to confirm these findings.
사용 후 LFP(LiFePO<sub>4</sub>)로부터 탄산리튬 제조 연구
왕제필 ( Jei-pil Wang ),김재흥 ( Jae-heung Kim ),고민석 ( Min-seok Go ),신민용 ( Min-yong Shin ),이동헌 ( Dong-hun Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2021 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2021 No.-
본 연구에서는 LFP(LiFePO<sub>4</sub>)로부터 탄산리튬을 회수하기 위해 황산 침출 후 CO<sub>2</sub> 열반응을 통해 탄산리튬을 제조하였다. LFP 10g을 H<sub>2</sub>SO<sub>4</sub> 50ml에 장입하여 60분간 반응시켰다. 이때 H<sub>2</sub>SO<sub>4</sub>의 농도는 0.5, 1, 2M로 변화시켜 실험을 진행하였다. 반응이 끝난 용액은 감압여과를 실시하였으며 여과 후 용액은 400℃에서 3시간 건조하였다. 건조가 끝난 산물은 활성탄과 1:1 비율로 혼합하여 900℃, CO<sub>2(g)</sub> 300cc/min에서 3시간 반응하였다. 반응 후 산물은 증류수와 1:30의 고액비로 수침출 및 감압여과를 진행하여 탄산리튬 용액과 불순물을 분리하였다. 회수한 탄산리튬 용액은 200℃에서 24시간 건조하여 탄산리튬 분말을 제조하였다. 탄산리튬 분말은 XRD 및 ICP 분석을 실시하였다.