Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Sintering Properties of Artifical Lightweight Aggregate Prepared from Coal Ash and Limestone

석탄회와 석회석으로 제조된 인공경량골재의 소성특성

  • Kim, Do-Su (Recycling Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Lee, Churl-Kyoung (Recycling Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Jong-Hyeon (Dangjin Thermal Power Plant, Korea East-West Power General Company)
  • 김도수 (한국지질자원연구원 자원활용부) ;
  • 이철경 (한국지질자원연구원 자원활용부) ;
  • 박종현 (한국동서발전주식회사 당진화력발전처)
  • Published : 2002.01.01
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Abstract

In this study, sintering properties of Artificial Lightweight aggregates(ALAs) prepared from coal ash as a function of sintering temperature (900$^{\circ}$C, 1000$^{\circ}$C, 1100$^{\circ}$C) and time (2min, 5min, 10min) when limestone added as lightweight mineral was investigated. Increasing the sintering temperature resulted simultaneously from a decline of quartz mineral as well as growth of mullite mineral. Addition of limestone to ALAs newly formed sintered minerals such as clinoptilolite and plagioclase. Sintering effect of ALAs prepared from coal ash and limestone was more affected by a sintering temperature than time. As sintering temperature and time increae, transition of macropore to micropore and formation of closed pores were happened, consequently shrank the total pore volume of ALAs. The surface of ALAs sintered at 1000$^{\circ}$C for 5min was nearly not detected open pores due toe amalgamation effect of molten slag layer but homogeneous distributions of closed pores with micro-scale were examined in cross sectional area ALAs. Sintering temperature and time which present the most adequate state, in the preparation of ALAs, are corresponded to 1000$^{\circ}$C and 5min, respectively.

본 연구에서는 석탄회로 제조된 인공경량골재에 석회석을 첨가하였을 때 소성온도 및 시간에 따른 소성특성을 관찰하였다. 소성온도의 증가에 따라 quartz($SiO_2$)가 감소한 반면 mullite($3Al_2O_3{\cdot}2SiO_2$)가 증가되었으며, 석회석의 첨가에 의해 clinoptiolite와 pagioclase와 같은 소성에 의한 소성광물이 생성되었다. 석탄회 및 석회석으로 제조된 경량골재의 소성성은 주로 소성시간보다는 소성온도에 의해서 좌우되는 것으로 확인되었다. 또한 소성온도 및 시간의 증가는 골재내 형성된 거대기공의 미세화 및 폐기공의 형성으로 전체 기공부피를 축소시키는 경향을 나타냈다. 1000$^{\circ}$C에서 5분가 소성시킨 경량골재의 표면은 용융 슬래그 층의 융착현상에 의해 개기공이 거의 없었으나 내부는 발포가스에 의해 수 ${\mu}$의 미세기공이 폐기공 형태로 균일하게 분포하였다. 이로부터 석회석이 첨가된 소성 경량골재의 적정 소성조건은 소성온도는 약 1000$^{\circ}$C, 소성시간은 5분이 바람직한 것으로 나타났다.

Keywords

References

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