Applied Chemistry for Engineering, Vol.24, No.4, 382-390, August, 2013
폐 소다석회 유리의 조성조절에 의한 발포유리블록의 제조
Preparation of Foamed Glass Block from Recycled Soda-lime-silicate Glasses by Chemical Composition Control
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초록
소다석회 조성의 폐 병유리를 대상으로 효율적인 재활용방안을 찾기 위해서 발포화에 적절한 조성의 조절을 통해 직접 보온단열재 발포유리블럭을 제조할 수 있는 공정을 조사하였다. 폐 병유리의 직접 발포화를 위해 첨가되는 성분 및 조성은, 폐 유리분말 100중량부에 대하여 SiO2 10중량부, Na2SO4 0.5중량부, B2O3 3.0중량부, 그리고 발포제로서 카본 블랙류 탄소재 0.3중량부이다. 발포공정은 턴넬키른에서 진행하며, 발포소성 조건은 폐 유리분말의 입도는 -325 mesh, 발포소성온도는 830∼850 ℃, 발포시간은 30∼35 min이 바람직하다. 상기 조건하에 제조된 발포체는 밀도가 0.17 ∼0.21 g/cm3, 열전도도 0.06 ± 0.005 kcal/hㆍmㆍ℃, 수분 흡수율 1.1∼1.5%, 압축강도는 20∼30 kgf/mm2의 물성을 나타내었다.
Foaming process of waste soda lime glasses by just chemical composition control of vitreous feed materials was investigated to find a novel and efficient recycling process. For the chemical composition control of feed materials, 10 wt. parts of SiO2, 0.5 wt. parts of Na2SO4, 3.0 wt. parts of B2O3, and 0.3 wt. parts of carbon black as the foaming agent were mixed with 100 wt. parts of soda-lime vitreous feed powder. Proper conditions for foaming process in tunnel kiln are the foaming temperature of 830∼850 ℃, the foaming time of 30∼35 min, and the vitreous feed powder particle size of -325 mesh. Properties of foamed glass blocks obtained under these foaming conditions showed the density of 0.17∼0.21 g/cm3, thermal conductivity of 0.06 ± 0.005 kcal/hㆍmㆍ.℃, moisture absorption of 1.1∼1.5%, and compressive strength of 20∼30 kgf/mm2.
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