Synthesis of ultrafine calcium carbonate powders from high concentrated calcium hydroxide solution

고농도 수산화칼슘 수용액으로부터 초미립 경질 탄산칼슘 분말의 합성

  • Ahn, Ji-Whan (Mineral Utilization and Mater. Division, Korea Institute of Geology, Mining & Materials(KIGAM)) ;
  • Park, Charn-Hoon (Department of Materials and Resources Engineering, Inha University) ;
  • Kim, Jeong-Heo (School of Material Science and Engineering, Seoul National University) ;
  • Lee, Jong-Kook (Department of Materials Engineering, Chosun University) ;
  • Kim, Hwan (School of Material Science and Engineering, Seoul National University)
  • 안지환 (한국자원연구소 자원활용소재연구부) ;
  • 박찬훈 (인하대학교 자원공학과) ;
  • 김정효 (서울대학교 재료공학부) ;
  • 이종국 (조선대학교 재료공학과) ;
  • 김환 (서울대학교 재료공학부)
  • Published : 1996.11.01


Ultrafine calcim carbonate powders with the size of $0.05~0.1\;{\mu}m$ and the calcite phase were synthesized by the nozzle spouting method, which could be only obtained when high calcium ion concentration within slurry was maintained at the beginning of the reaction. But, in the regions of low ${Ca(OH)}_2$ concentration (0.5~1.0 wt%) or high ${Ca(OH)}_2$ concentration (<3.0 wt%), synthesized calcium carbonate powder was shown the large particle size with agglomeration. To obtain ultrafine calcium carbonate powder in this region, the methods of slurry circuation and $CO_{2}$ gas supply were changed during reaction. Resultly, it was possible to synthesize ultrafine particles (${\approx}0.05{\mu}\textrm{m}$)in the regions of low ${Ca(OH)}_2$ concentration (${\approx}0.5wt%$) and high ${Ca(OH)}_2$ concentration (${\approx}0.5wt%$), which can not be obtained the fine calcium carbonate powder still now.



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