Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Studies on the Fusibility of Fly Ash-Flux Mixtures

융제 첨가 비산회의 융융성 연구

  • Yang, Hyun S. (Dept. of Industrial Chemistry, Graduate School, Chungnam Nat'l Univ.) ;
  • Lee, Kyu C. (Dept. of Industrial Chemistry, Graduate School, Chungnam Nat'l Univ.) ;
  • Park, Chu S. (Korea Institute of Energy Reserch) ;
  • Received : 1997.08.19
  • Accepted : 1997.10.22
  • Published : 1997.12.10
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Abstract

The effects of CaO and MgO fluxes on the fusibility of fly-ashes were investigated for two different fly-ashes. A fusion temperature of mixtures of selected fly-ashes and fluxes were measured by the ASTM test method(D1857) and the differential thermal analysis. IDT of these samples added CaO and MgO as a fluxing agent dropped in the range of 114 to $294^{\circ}C$ and 80 to $224^{\circ}C$, respectively. Compared with ash fusion temperature to Base/Acid ratio, the lowest ash fusion temperature were measured in the range of 0.7 to 0.8 for CaO-fly ash mixtures and 0.3 to 0.4 for MgO-fly ash mixtures. As a result, MgO in small addition acted as a more effective flux than CaO. A conventional Base/Acid ratio and liquidus point of ternary diagram did not show a good correlation with ash fusion temperature for these samples. In pure fusion temperature of fly ash-mixtures, DTA was better method than ASTM test method.

구성분이 상이한 2종의 비산회를 대상으로 CaO와 MgO융제의 첨가시 용융온도변화에 대하여 고찰하였다. 용융온도측정을 위하여 ASTM 용융온도측정법과 시차열분석법이 사용되었다. CaO융제의 첨가시 시료에 따라 $111{\sim}294^{\circ}C$의 융점(IDT)강하효과를 얻을 수 있었으며 MgO첨가시에는 $80{\sim}224^{\circ}C$의 융점강하효과를 보였다. Base/Acid Ratio와의 비교에서 CaO flux는 0.7~0.8, MgO flux는 0.3~0.4의 범위에서 가장 낮은 용융온도로 측정되었다. 따라서 적은 첨가량으로도 MgO는 CaO보다 더 효과적인 융제로 작용하였다. 이러한 융제첨가시의 용융온도 변화는 용융성 분석에 보편적으로 사용되어지는 Base/Acid ratio와는 상관성이 없음을 알 수 있었고 $XO-SiO_2-Al_2O_3$ [X=Ca, Mg]삼성분계의 liquidus 온도와도 일치하지 않음을 알 수 있었다. 시차열분석결과와 ASTM용융온도와의 비교에서 용융성과 흐름성(점성)등의 물성이 복합적으로 반영되어 있는 ASTM측정법 보다는 시차열분석이 비산회의 순수한 용융온도를 분석할 수 있는 측정법임을 확인할 수 있었다.

Keywords

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