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Environmental Engineering Research 2000;5(2): 85-91.
RELATIONSHIP BETWEEN POURING INDEX AND COMPOSITION OF WASTE INCINERATION RESIDUES
Mi-Ran Kim1, Jea-Keun Lee1, Hyun-Dong Lee1, Young-Hwan You2, and Min-Gi Jee2
1Department of Environmental Engineering, Pukyong National University, Pusan 608-737, Korea
2Hyundai Precision & Ind. Co., Ltd., Kyunggi-do 449-910, Korea
Corresponding Author: Jea-Keun Lee ,
Received: June 8, 2000;  Accepted: August 2, 2000.
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ABSTRACT
In order to improve fusibility and fluidity in the melting processes of waste incineration residues, ash compositions were adjusted by using basicity, that is the mass ratio of CaO/SiO2 and/or of (MgO+CaO+ K2O+Na2O)/(SiO2+Al2O3+Fe2O3}). Then melting temperature(Tm) and pouring temperature(Tp) were measured. When CaO/SiO2: mass ratio of the flyash from sewage sludge incineration(FAl) and from municipal waste incineration(FA2) was adjusted to 1, melting temperature and pouring temperature of FA1 appeared to be very low, but FA2 appeared to be high. On the other hand, the melting temperature and the pouring temperature of both FA1 and FA2 were the lowest when the ratio of (MgO+CaO+K2O+Na2O)/(SiO2+ Al2)3+Fe2O3) was between 0.75 and 0.8. Moreover, temperature difference) JT) between the pouring temperature and the melting temperature was the lowest when the ratio was around 0.8. The range of the lowest zJT was around 0.8 which was similar to the range of the lowest pouring temperature. Therefore, adjustment of the ratio of (MgO+CaO+K2O+Na2O)/(SiO2+AI2O3+Fe2O3) to 0.75 to 0.8 would be quite effective in improving fusibility and fluidity in the flyash melting process.
Keywords: flyash melting | pouring index | ash composition | melting temperature | pouring temperature
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