Development and Physical Properties of a Glass-ceramic from Fly Ash of Power Station

Coal fly ash, produced from a power plant in Korea was used for the production of glass-ceramics and the physical properties of glass-ceramics were evaluated. CaO and TiO$_2$ were added into the fly ash during the melting process to reduce the viscosity of molten glass and to induce internal crystallization of glass, respectively. Glass-ceramic was produced through a single stage heat treatment (at 950∼1050$\^{C}$ for 37∼240 min) after preparing glass (iota fly ash powder. As a result, a new tiny rod type crystals (a=7.4480, b=10.7381, c=4.3940 A, $\alpha$=94.9, $\beta$=98.6, γ=108.5°) was found in the glass-ceramics, which showed attractive mechanical properties, high hardness (7.1∼7.6 GPa) and wear resistance (by erosion test). Thus a glass-ceramic produced from thermal power plant fly ash and cell as a source for CaO exhibits a suitable treatment for the recycling and exploitation of waste materials and would be acceptable for a new application far building materials.

발전소의 석탄재로부터 결정화유리의 제초 및 물리적 특성

국내화력발전소의 비산재를 재활용하고자 결정화유리를 제조하여 그 물리적 특성을 평가하였다. 용융석탄재의 융점을 낮게 하기 위하여 CaO와 유리의 결정화를 유도하기 위하여 TiO$_2$를 첨가하였다. 저융점의 유리를 제조 후, 일단계 열처리 (950~105$0^{\circ}C$에서 30~240분)에 의하여 결정화유리를 제조하였다. 그 결과로, 제조된 결정화유리는 새로운 미세한 결정상(a=7.4480, b=10.2381, c=4.3940 A, $\alpha$=94.9, $\beta$=98.6, ${\gamma}$=108.5$^{\circ}$)을 갖고, 높은 경도(7.1~7.6 GPa)와 고 내마모성을 나타냈다. 이처럼 화력발전소의 비산재와 CaO의 공급원인 조개껍질로 제조된 결정화유리는 자원 재활용, 건축자재로 사용될 수 있는 새로운 응용성을 보여주었다.