Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Synthesis of Columnar Na-P Zeolite by Hydrothermal Process from Natural Zeolite of Korea

천연 Zeollte로부터 열수합성에 의한 주상 Na-P Zeolite합성

  • Zhang, Yong-Seon (Dept. of Environment and Ecology, National Institute of Agricultural Science and Technology) ;
  • Jung, Pil-Kyun (Dept. of Environment and Ecology, National Institute of Agricultural Science and Technology) ;
  • Kim, Sang-Hyo (Dept. of Environment and Ecology, National Institute of Agricultural Science and Technology)
  • 장용선 (농업과학기술원 농업환경부) ;
  • 정필균 (농업과학기술원 농업환경부) ;
  • 김상효 (농업과학기술원 농업환경부)
  • Received : 2003.09.15
  • Accepted : 2003.12.02
  • Published : 2003.12.30
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Abstract

This study was conducted to develop n convenient and efficient granular type absorbent with high CEC from powdery zeolite, which is a waste produced while crushing the natural zeolite of Korea to get a particular particle size. The change of mineralogical characteristics during hydrothermal alternation of natural zeolite to Na-P zeolite in alkaline solution at various reaction times was determined by X-ray diffraction (XRD), scanning electron microscopy (SEM), and total elemental analysis. The columnar aggregate of Na-P Zeolite was produced by calcinating the natural zeolite-charcoal extrudates of about 3 mm diameter. In 24 hours reaction, clinoptillonite, mordenite and feldspar in natural zeolite were disappeared by 3 N NaOH treatment, while Na-P Zeolite with spherical granular structure was newly detected by XRD. As increasing reaction time, Si/Al ratio in remaining solution was deceased. The CEC of the synthesized material increased more than 2 times compared with that of natural zeolite, although the diameter of Na-P zeolite were rather increased.

본 연구는 천연 zeolite를 파쇄하여 일정크기의 입제를 생산하는 과정에서 부산물로 생산되는 다량의 미분을 이용하여 양이온치환용량이 높은 입상의 흡착제를 개발할 목적으로 수행하였다. 천연 zeolite를 알카리 용액의 열수합성법을 활용하여 Na-P zeolite로 전환시켰다. 반응시간별 합성과정 중 광물학적 특성 변화를 X-선회절, 주사전자현미경, 화학조성 및 CEC의 변화를 통하여 구명하였다. 주상 Na-P zeolite의 입단은 천연 zeolite-숯혼합물을 약 3 mm 두께로 압축성형한 후 열처리하였으며, 연속적인 3 M NaOH 처리로 천연 zeolite의 주요구성광물인 climoptile, moderite, 장석 등의 광물이 파괴되고 새로이 구형의 Na-P zeolite가 24시간 처리에서 관찰되었다. 반응시간이 증가함에 따라 잔류용액 중 Si/AI비는 감소하였으며, 입단 크기의 증가에도 불구하고 Na-P zeolite의 CEC는 출발물질로 사용된 미분의 천연 zeolite에 비하여 2배 이상 증가하였다.

Keywords

References

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