Characteristics of Soil Conditioner Pellets Fabricated by Self-propagating Combustion Methods Using Coal Refuse
2008
Kim, B.G. (Korea Institute of Geoscience and Mineral Resources, Mineral Resource Research Division, Daejeon, Republic of Korea) | Lee, G.S. (Korea Institute of Geoscience and Mineral Resources, Mineral Resource Research Division, Daejeon, Republic of Korea), E-mail: [email protected] | Nam, C.W. (Korea Institute of Geoscience and Mineral Resources, Mineral Resource Research Division, Daejeon, Republic of Korea) | Park, C.L. (Korea Institute of Geoscience and Mineral Resources, Mineral Resource Research Division, Daejeon, Republic of Korea)
Calcined clay granules (pellet) have been used as a soil conditioner. The space among the pellets can secure drainage of water in soil and, simultaneously, can keep water for plants in the inner pore of that. However, the usage of the pellet has been restrained because fabrication of that requires a high energy and cost for heating over the temperate of 1000℃. Recently, SCS(Self-propagating Combustion and Sintering) method was developed and this method use the combustion energy of the preliminary mixed combustible. The SCS method is suitable to fabrication of small porous aggregate and requires a very low cost. This research applied the SCS method to coal refuses for fabrication of soil conditioner pellets. The coal refuses were pulverized under the size of 100㎛ and the pulverized powders were pelletized to the size of 4~6mm. The pellets were heated at the temperature of 1200℃ in the SCS furnace that was specially prepared for this research. Characteristics of the pellets were investigated and were compared with that of ordinary calcined clay pellet of kaolin; porosity, pore size distribution, bulk density, pH and etc.. Characteristics of the moisture retention in the pellets were measured by the centrifugal method: ASTM D425-88. The pellets of the coal refuses showed the higher values of the filed capacity and the plant-available water than that of kaolin pellet. These results suggest the very low cost process that can utilize the coal refuses and can fabricate the lightweight porous soil conditioner of the very high plant-available water.
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