Preparation of Light-Weight Forsterite Insulation Materials Through Extrusion Processing

Abstract

Light-weight insulation materials were prepared by extrusion processing using forsterite raw tailings, light-burned magnesia and fused magnesia as main raw materials with addition of rice hull powder as a pore-forming agent. The results show that the plasticity of green compact and the cold compressive strength of bricks are improved with the addition of 2-3 wt% dextrin as plasticizer. Light weight insulation materials, which meet different application requirements, were prepared by controlling the addition amount of rice hull powder by firing at 1550 °C with volume weight of obtained materials varies from 1.4-1.8 g/cm3, thermal conductivity at 600 °C is less than 0.48 W/(m•K), cold compressive strength varies from 8-24MPa and reheating linear change rate is less than 1% (1400°C × 6h).