폐알루미늄 드로스와 유리 ＂cullet＂를 이용한 발포성 단열재 개발

Abstract

The waste aluminium dross(WAD), abandoned from the roast process of refining aluminium was examined if it can be used for developing a cellular glass thermal insulation, in conjunction with use of the waste glass called "cullet". To produce a cellular insulation, these two wastes were separately ball-milled and passed through 150 mesh. The cullet powder so produced was mixed with the WAD powder from 10 to 50% on a weigh basis. The mixtures were then blended with the foaming agents (i.e., Carbon, Na2CO3, Na2SO4, CaCO3 and MgCO3) to form structural celluar shapes. The blended mixture was transferred to an alumina cricible and fired at an electrical muffle furnace at 960℃ - 1100℃. The formed specimens were tested for visual inspection, water absorption, compressive strength and thermal conductivity. It was appeared that a high quality cellular thermal insulation can be abtained from the mixture composed of 80% of "cullet" and 20% of WAD, with addition of 5% Na2CO3 when fired at the temperature of 1000℃. In view of visual inspection, the formed product as above showed a homogeneous rigid mass of closed cells. It was also found that the thermal conductivity was 0.095 kcal/hr/m2, with its density of 0.59 g/cc, its compressive strength of 27.0 kg/cm2 and its water absorption of 0.48%. It was concluded that a quality cellular glass thermal insulation can be made when 80% of "cullet" and 20% of WAD, with addition of 5% Na2CO3 (as a forming agent), are composed, subject to firing at 1000℃.