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J Korean Soc Environ Eng > Volume 37(4); 2015 > Article
J Korean Soc Environ Eng 2015;37(4): 246-252. doi: https://doi.org/10.4491/KSEE.2015.37.4.246
인 흡착을 위한 Mill Scale 전처리 및 Magnetite 제조 연구
천현철, 최영균
대구대학교 환경공학과
A Study on the Mill Scale Pretreatment and Magnetite Production for Phosphate Adsorption
Hyuncheol Chun, Younggyun Choi
Department of Environmental Engineering, Daegu University
Corresponding author  Younggyun Choi ,Tel: 053-850-6692, Fax: 053-850-6699, Email: choiyg@daegu.ac.kr
Received: March 18, 2015;  Revised: March 24, 2015;  Accepted: April 30, 2015.  Published online: April 30, 2015.
In steel factory, hot roller cleaning process produces a lot of iron oxide particles called as mill scale. Major components of these particles are wustite (FeO), magnetite (Fe3O4), and hematite (Fe2O3). In this study, we tried to produce pure magnetite from the mill scale because of the largest phosphate adsorption capacity of the magnetite. The mill scale was treated with acid (HCl+H2O2), base (NaOH), and acid-base (H2SO4+NaOH). Batch adsorption tests showed the acid and/or base treatment could increase the phosphate adsorption capacity of the iron oxides from 0.28 to over 3.11 mgP/g. Magnetite, which could be obtained by acid and base treatment of the mill scale, showed the best adsorption capacity. From the kinetic analysis, both Freundlich and Langmuir isotherm well described the phosphate adsorption behavior of the magnetite. In Langmuir model, maximum phosphate adsorption capacity was found to be 5.1 mgP/g at 20℃.
Key Words: Magnetite, Mill Scale, Pretreatment, Phosphate Adsorption
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