Enormous amount of oyster shell waste has been disposed near oyster farm sites along the coast of Korea. To test the possibility to recycle the waste as a substitute for limestone, mineralogical and chemical characteristics of oyster shell and limestone were investigated. In order to obtain the info...
Enormous amount of oyster shell waste has been disposed near oyster farm sites along the coast of Korea. To test the possibility to recycle the waste as a substitute for limestone, mineralogical and chemical characteristics of oyster shell and limestone were investigated. In order to obtain the information on the characteristics, XRD, XRF, optical microscope, SEM, EDS, EPMA, ICP, TGA-DSC, and BET were used. The oyster shells from Taean, Tongyeong, Yeosu, and Boryeong were used for this study. Mineralogical and chemical analyses showed that all oyster shells and limestones are composed of CaCO3(calcite) with the exception of adductor muscle scar and ligament composed of aragonite. The thin sections showed that oyster shells are composed of three shell microstructures : prismatic layer, nacreous layer, and chalk layer. The oyster shells and the limestones were calcined at temperatures of 700 – 1000 ℃ for 0.5 – 5 hours. For oyster shells, calcination begin 50 ℃ lower than limestone, but the BET surface area of limestone show higher values than those of the oyster shells. When calcined with marine sediment, there was no noticeable changes in the surface area. However, for the samples calcined with NaCl, the BET surface area increased and then decrease again compared with pure oyster shells. This research show that there are differences in mineralogy, chemistry and microstructure between oyster shells and limestone, and these differences affect calcination characteristics of those samples. Oyster shells are thought to be able to efficiently produce quicklime with relatively less energy than limestone.
Enormous amount of oyster shell waste has been disposed near oyster farm sites along the coast of Korea. To test the possibility to recycle the waste as a substitute for limestone, mineralogical and chemical characteristics of oyster shell and limestone were investigated. In order to obtain the information on the characteristics, XRD, XRF, optical microscope, SEM, EDS, EPMA, ICP, TGA-DSC, and BET were used. The oyster shells from Taean, Tongyeong, Yeosu, and Boryeong were used for this study. Mineralogical and chemical analyses showed that all oyster shells and limestones are composed of CaCO3(calcite) with the exception of adductor muscle scar and ligament composed of aragonite. The thin sections showed that oyster shells are composed of three shell microstructures : prismatic layer, nacreous layer, and chalk layer. The oyster shells and the limestones were calcined at temperatures of 700 – 1000 ℃ for 0.5 – 5 hours. For oyster shells, calcination begin 50 ℃ lower than limestone, but the BET surface area of limestone show higher values than those of the oyster shells. When calcined with marine sediment, there was no noticeable changes in the surface area. However, for the samples calcined with NaCl, the BET surface area increased and then decrease again compared with pure oyster shells. This research show that there are differences in mineralogy, chemistry and microstructure between oyster shells and limestone, and these differences affect calcination characteristics of those samples. Oyster shells are thought to be able to efficiently produce quicklime with relatively less energy than limestone.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.