Development of Lightweight Refractory Insulating Brick Using Recycled Paper Processing Waste As Alternative Raw Material

27640

Production of porous anorthite heat-insulating ceramics from mixtures of fireclay (chamotte), recycled paper processing waste sludge and pore-making sawdust addition are investigated. Recycled paper processing waste was used as a suitable alternative raw material source to produce porous anorthite refractories due to their organic (cellulose fibers) and inorganic (calcium carbonate, clay minerals) content. Prepared slurry mixtures were shaped, dried and fired. Highly porous anorthite ceramics from the mixtures with up to 30% sawdust addition was successfully produced. The cellulose fibers and inorganic content of the waste provided to form micro-porosity and anorthite composition (CaO·Al2O3·2SiO2) of the fired samples, respectively. Physical properties such as bulk density, apparent porosity, percent linear change were investigated as well as the mechanical strengths and thermal conductivity values of the samples. Thermal conductivities of the samples decreased from 0.25 W/mK (1.12 g/cm^3) to 0.13 W/mK (0.64 g/cm^3) with decreasing their density. Samples were stable at high temperatures up to 1100°C, and their cold strength was sufficiently high. Produced highly porous anorthite ceramics could be used for insulation in high temperature applications.

505

Porosity , Thermal conductivity , Anorthite , Insulating firebrick , Recycled paper waste

Afyon Kocatepe University Journal Of Science an‎d Engineering

512

Afyon Kocatepe University Journal Of Science an‎d Engineering