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http://dx.doi.org/10.9719/EEG.2018.51.6.485

Mineralogical Changes of Oyster Shells by Calcination: A Comparative Study with Limestone  

Lee, Jin Won (Department of Environmental Engineering, Kunsan National University)
Choi, Seung-Hyun (Department of Environmental Engineering, Kunsan National University)
Kim, Seok-Hwi (Institute for Advanced Engineering)
Cha, Wang Seog (Department of Environmental Engineering, Kunsan National University)
Kim, Kangjoo (Department of Environmental Engineering, Kunsan National University)
Moon, Bo-Kyung (Korea Western Power, Co., Ltd.)
Publication Information
Economic and Environmental Geology / v.51, no.6, 2018 , pp. 485-492 More about this Journal
Abstract
About 300 thousand tones of oyster shells are produced annually and, thus, their massive recycling methods are required. Recently, a method, utilizing them as wet desulfurization materials after removal of organic matters and changing $CaCO_3$ phase into CaO through calcination, is under consideration. This study investigates the mineralogical changes (specific surface area, phase changes, surface state, etc.) of oyster shells by calcination and their characteristics were compared with those of limestone. Uncalcined oyster shells showed the higher specific surface area than limestone because the former are composed of platy and columnar structures. In contrast, investigated limestone showed a dense structure. The phase change of oyster shells occurred at lower temperature than that of limestone. The specific surface area of oyster shell decreased significantly after calcination while limestone depicted a drastic increase. Small amount of Na contained in oyster shell was suggested as the cause of this phenomenon; in that, it acted as a flux causing melting and sintering of oyster materials at lower temperature. Because of this, an additional phenomenon was observed that a part of shell materials remained untransformed even at higher calcination temperature and after longer treatment period due to the sintered surface, which covers the rest parts. Further studies investigating the effect of this phenomena from the perspective of desulfurization is required.
Keywords
oyster shell; desulfurization; calcination; flux; sintering phenomenon; coal-burning power plant;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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