| 摘要 |
1. Method of producing ceramic material of high porosity and low apparent density of clay containing 64.50% of SiO2, 18.80% of Al2O3, 3.71% of Fe2O3, 0.70% of FiO3, 0.83% of CaO, 1.80% of MgO, 2.70% of K2O and 0.80% of Na2O, with ignition loss of 5.70% characterised in that raw clay is dried to obtain the humidity below 2% of H2O and is milled to obtain a powder of bulk density of around 0.6 g/cm<3>, and next, the resulting powder is loosely poured to the mould of any shape and is burned in the temperature of 1150-1220 degrees C, till a material of apparent density of below 0.6 g/cm<3> is obtained.
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