| Budget Amount *help |
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2004: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 2003: ¥3,500,000 (Direct Cost: ¥3,500,000)
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| Research Abstract |
In order to utilize the Lime Cake discharged from beet sugar factory effectively, solidification method, humidity self-control characteristics, and interior VOCs adsorption characteristics were studied. The results are summarized as follows :
(1)It was found that solidified substance with high compressive strength (ca.20MPa) was obtained by heating a green compact consists of the Lime Cake, calcium hydroxide, and scallop powder at 100-150℃ in steam-CO_2 atmosphere.
(2)The Lime Cake has comparatively high surface area (32m^2/g) with pore radius of 1.5-2.5nm. The water vapor adsorption-desorption characteristics of the solidified substances were investigated and considered as candidates for humidity self-control materials.
(3)By adsorbing the formaldehyde gas, the Lime Cake has the ability of lowering the interior concentration at 0.05ppm or less.
(4)The amount of adsorbed formaldehyde on the Lime Cake after evacuated at room temperature was 4.2x10^<-4>mol/g, and was larger than those on commercial Diatomaceous Earth (3.6x10^<-4>mol/g).
(5)On the other hand, the amounts of adsorbed benzene and toluene on the Lime Cake at the same conditions were smaller than those on the commercial Diatomaceous Earth.
(6)The elimination of adsorbed fomsaldehyde on the Lime Cake and commercial Diatomaceous Earth begin at around 50℃ and reach to a maximum at 106℃ and 128℃, respectively.
(7)By an IR study, it was suggested that formaldehyde adsorbed on basic site on the Lime Cake, and strong acid site on commercial Diatomaceous Earth.
In conclusion, the solidified Lime Cake can be expected for the application as a building wall material with humidity self-control characteristics and the ability of lowering the interior formaldehyde concentration.
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