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The Effects of Marine Sediments and NaCl as Impurities on the Calcination of Oyster Shells

굴패각 소성시 해저 퇴적물과 NaCl 불순물이 소성 특성에 미치는 영향

  • Ha, Su Hyeon (School of Earth System Sciences, Kyungpook National University) ;
  • Kim, Kangjoo (Department of Environmental Engineering, Kunsan National University) ;
  • Kim, Seok-Hwi (Center for Plant Engineering, Institute for Advanced Engineering) ;
  • Kim, Yeongkyoo (School of Earth System Sciences, Kyungpook National University)
  • 하수현 (경북대학교 지구시스템과학부) ;
  • 김강주 (군산대학교 환경공학과) ;
  • 김석휘 (고등기술연구원, 플랜트 엔지니어링 센터) ;
  • 김영규 (경북대학교 지구시스템과학부)
  • Received : 2019.05.31
  • Accepted : 2019.06.19
  • Published : 2019.06.28

Abstract

The calcination of oyster shells have been studied as the possible substitute for the limestone used as an absorbent of $SO_2$ gas. However, since pure shells can not be used in calcination process, some impurities are contained and the changes in the characteristics of the calcination products are expected. In this study, the surface characteristics of the calcination products are investigated by mineralogical analysis according to the contents of NaCl, which can be derived from sea water, and sediments on the surface of the shell as impurities. The marine sediments on the shells were mainly composed of quartz, albite, calcite, small amounts of amphibole and clay minerals such as ilite, chlorite and smectite. After calcination of oyster shells mixed with 0.2-4.0 wt% sediments at $900^{\circ}C$ for 2 hours, regardless of the dehydration, dehydroxylation, and phase change of these minerals at the lower temperature than this experiment, no noticeable changes were observed on the specific surface area of the calcined product. However, when mixed with 0.1 to 2.0 wt% NaCl, the specific surface area generally increases as compared with the shell sample before calcination. The specific surface area increases with increasing amount of salt, and then decreases again. This is closely related to the changes of surface morphology. As the amount of NaCl increases, the morphology of the surface is similar to that of gel. It changes into a slightly angular, smaller particle and again looks like gel with increasing amount of NaCl. Our results show that NaCl affects morphological changes probably caused by melting of some oyster shells, but may have different effects on the specific surface area of calcination product depending on the NaCl contents.

Keywords

oyeter shell;calcination;impurity;sediment;NaCl

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Fig. 1. XRD patterns of oyster shell and marine sediment collected from oyster shells before and after calcination (Ab: albite, Am: amphibole, C: calcite, Ch: chlorite, I:illite, K: kaolinite, Q: quartz, S: smectite).

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Fig. 2. SEM images of calcined pure Taean oyster shell powder. (a) 3000×, (b) 15000×.

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Fig. 3. SEM images of calcined Taean oyster shell powder containing sediment (a) 0.2 wt% (3000×), (b) 0.6 wt% (900×), (c) 1.4 wt% (3500×), (d) 2.4 wt% (2000×), (e) 4.0 wt% (3000×), (f) 4.0 wt% (1000×).

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Fig. 4. SEM images of calcined Taean oyster shell powder containing NaCl (3000×) (a), (b) 0.1 wt%, (c) 0.3 wt%, (d), (e) 0.7 wt%, (f) 1.2 wt%, (g), (h) 2.0 wt%.

Table 1. Chemical composition of sediment used in this experiment (wt%)

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Table 2. BET surface areas of Taean oyster shells containing sediment and NaCl salt (m2/g)

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Acknowledgement

Supported by : 한국연구재단

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