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RICE HUSK ASH REFRACTORY: THE TEMPERATURE DEPENDENT CRYSTALLINE PHASE ASPECTS

Cylindrical blocks of Rice Husk Ash thermal insulators were made using die pressing method. The husks were burnt in an open environment and the resulting black ash heated in a carbolite furnace at a controlled temperature of 650 O C. The initial impurities of the resulting milky white RHA were determined by XRF technique. The RHA were subsequently mixed with binders and sintered at a temperature range of 1000 to 1400 O C. X-ray diffraction (XRD) Spectroscopy was carried out to determine the major crystallographic phases. Two crystalline silica phases, tridymite and cristobalite were dominant. Crystallite size of the insulators at this range of temperature varies from 6nm to 10.02nm depending on the dominant phase.