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Effect of oxalic acid on the iron content of pottery stone

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2004, 14(6), pp.257~261
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Kyung-Nam Kim 1,  Hyun Park 1

1강원대학교

Accredited

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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