도석의 탈철에 관한 Oxalic acid의 영향에 관한 연구
Effect of oxalic acid on the iron content of pottery stone
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초록
태백 도석은 주로 quartz와 함께 kaolinite가 포함되어 있다. 도석의 특성분석은 XRD, XRF, TG-DTA, SEM 등을 이 용하여 결정상과 화학성분 등을 분석하였다. 원석의 화학조성은 71.75 wt%SiO2, 22.10 wt%Al2O3, 1.86 wt%CaO, 2.97 wt%K2O, 0.62 wt%Fe2O3 등이다. 3 mm 크기의 도석을 80oC의 10 % 수산 농도에서 침출하면 탈철은 0.62 wt%에서 0.24 wt%로 감소하 고 백색도가 증가하였다. 도석의 분쇄는 planetary ball mill을 이용하여 지르코니아 볼로 분쇄하였으며, 입도 크기는 2~5 mm 크기로 균일하게 분쇄되었다.
Abstract
The pottery stones from the Taebek area consist of abundant quartz with kaolinite. In this study, the characteristics of pottery stones were examined by XRD (X-ray diffractometer), XRF (X-ray fluorescence spectrometer), TG-DTA and SEM (Scanning Electron Microscope). The chemical compositions of the raw ore showed 71.75 wt%SiO2, 22.10 wt%Al2O3, 1.86 wt%CaO, 2.97 wt%K2O, 0.62 wt%Fe2O3. When pottery stone of 3 mm size was leached at 80oC with 10 % oxalic acid, the content of Fe2O3 was reduced from 0.62 wt% to 0.24 wt% and the whiteness was enhanced. Grinding of pottery stone was conducted by a planetary ball mill using media of zirconia, the average particle size was 2~5 mm.
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