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The aim of this study is to prevent the hardening of coal ash during transportation from power plants and storage. In order to prevent the coal ash from hardening, humidification and mixing with additives were applied.As a result, (1) humidification of coal ash at 40°C with air of 50-90%RH, the hardenability of coal ash greatly decreased because sulfur trioxide on the surface of the coal ash reacted with alkaline components such as calcium carbonate by humidification, (2) miximg coal ash with lime stone is the most effective method in reducing the hardenability because it reacts with the sulfur trioxide. The addition of 1-10% lime stone is necessary to prevent hardening.

Method of Preventing Coal Ash Hardening by Humidifying or Mixing with Additives