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J. Korean Ceram. Soc. > Volume 57(4); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(4): 378-384.
doi: https://doi.org/10.1007/s43207-020-00046-9
Pore structure and possibility of fine dust removal for bottom ash sand
Won‑Jun Lee1 , Jae‑Seung Lee1, Daiki Atarashi2, Yong‑Hyok Kim3, Seung‑Heun Lee4
1Industry‑Academic Cooperation Foundation, Gachon University, Seongnam 13120, South Korea
2Department of Chemistry, Interdisciplinary Graduate School of Science and Engineering, Shimane University, Matsue 690‑8504, Japan
3Resource Recycling Research Center, Yeongheung Power Division, Korea South-East Power Co, Incheon 23120, South Korea
4Department of Materials Science and Engineering, Kunsan National University, Gunsan 54150, South Korea
Correspondence  Won‑Jun Lee ,Email: wjlee76@kunsan.ac.kr
Received: December 10, 2019; Revised: February 17, 2020   Accepted: February 25, 2020.  Published online: April 30, 2020.
ABSTRACT
In this study, bottom ash sand was classified into sizes of 0.15 mm or less, 0.15∼0.6 mm, 0.6∼1.2 mm, 1.2∼2.5 mm, and 2.5∼5 mm by sand size. The results were evaluated with regard to fine dust removal. The bottom ash sand showed hysteresis in the adsorption and desorption of nitrogen gas, and the pore size was mostly over 100 nm as found by MIP measurement. As the size of bottom ash sand decreased from 0.6 mm, pore volume tended to increase. For this reason, when bottom ash sand is crushed to 0.6 mm or less, it is determined that the pore volume increases by converting closed pores into open pores. However, bottom ash sand of 0.6 mm or less is composed of pores of 10 μm or more, which are mostly used as fine dust passages, and thus the effect of removing fine dust is low. Bottom ash sand of 0.6 mm or more is composed of pores of 0.1 μm or more, which are considered to be effective in removing PM2.5 and PM10. In particular, the ratio of pores with sizes of 0.1∼2.5 μm, capable of removing PM2.5, is 56.1∼74.8%, which is expected to be effective at removing PM2.5.
Key words: Bottom ash · Sand · Pore size · Fine dust
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