Melting Properties of Bottom and Fly Ashes Derived from Incineration of Municipal Waste

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  • NISHINO Junya
    Environmental Process Development Department, Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd.
  • TAHARA Ken-ichi
    Environmental Process Development Department, Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd.

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  • 都市ごみ焼却灰及び飛灰の物性と溶融処理
  • トシゴミ ショウキャクバイ オヨビヒカイ ノ ブッセイ ト ヨウユウ ショリ

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Abstract

The melting of ash, including bottom ash and fly ash from municipal waste, is one of the effective way for reducing the volume of ash, making ash harmless and its recycling. For these purpose, it is necessary to melt it in lower temperature and to select the available way and its condition for melting process. In this report, physical and chemical properties of ash for melting were studied to select them. Harmlessness of slag which was important to evaluate the availability of melting process was examined by leaching test with acid solution. The melting temperature of ash and phase of slag had a closely relation with ternary diagram of SiO2CaO-Al2O3 system. The lowest melting temperature was found in the basicity (CaO/SiO2) of 0.9-1.0. The fluid temperature increased rapidly became melting more difficult in lower and higher ranges of basicity, 0.9-1.0. After melting ash, amount of leaching from slag became 10-2-10-3 smaller than ash before melting, showing that melting was the most effective way for making ash harmless. Property of leaching from slag was effected by its texture, especially that of non-crystal phase. It was concluded that the examination of leaching property was available to study the characteristics of melting process. It was also found that slag had to a prepared in lower basicity than 0.8-1.1, keeping the melting temperature lower, since amount of leaching from slag with eutectic texture in the range of basicity 0.8-1.1 was slightly increased.

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