Measurement of thermal diffusivity of fired and nonfired pellets by laser flash method

Abstract

The nonfired pellets have received attention in ironmaking industries from the point of view of energy saving. However, the accurate and systematic measurements of thermal diffusivity of nonfired pellets have not been reported yet, although they are required for the heat transfer analysis of ironmaking process. For these requirements, thermal diffuisivities of three kinds of nonfired pellets containing 1.20, 3.72 and 8.43 mass% combined water have been determined by the laser flash method in the temperature range between room temperature and 1273 K, and were compared with that of a fired pellet. Thermal diffusivity values of the nonfired pellets are found smaller than that of the fired pellet, and significantly depend on temperature and kinds of iron ore as raw material. Laser flash method for measuring thermal diffusivity at high temperature has been successfully applied to various materials for its excellent character such as high response and non-contact method.