Abstract
In this study, the utilization possibility of coal-preparation refuse emitted from Hwasun coal mine in Korea as a raw material for ceramic body was investigated. The firing shrinkage ratio of ceramic specimen made from the coal-preparation refuse was reduced with increasing the addition amounts of that, while the compressive strength was slightly decreased. The weight of ceramic body was also reduced because carbon contained in the coal-preparation refuse was burn by fring. The water adsorption ratio of the ceramic specimen was under 10 wt%, and the compressive strength of that was over 21 MPa at over $1,150^{\circ}C$ for 2 hr. Therefore, it was possible to make the 1st garde clay brick of KS L 4201 from the coal-preparation refuse.
석란광산에서 발생되는 선탄폐석을 효율적으로 이용하기 위하여 세라믹스 원료 소재로의 활용 가능성을 고찰하였다. 석탄폐석의 첨가량이 증가함에 따라 소성 시험편의 소성수축률이 저하되고, 압축강도는 약간 감소하는 등의 효과와 선탄페석에 함유되어 없는 탄소분의 연소에 의한 기공의 증가로 제품의 경량화도 가능한 것으로 판단되었다. 선탄폐석의 첨가량을 변화시켜 $1,150^{\circ}C$ 이상에서 소성한 경우 흡수율은 $10\;wt\%$ 이하를 나타내었고, 압축강도는 모두 21MPa이상으로 KS L 4201에서 규정한 1종 점토벽돌의 기준에 모두 적합함을 확인할 수 있었다.
