Manufacture of refractory insulating bricks using fly ash and clay

Abstract One of the residues or byproducts generated in coal burning power plants that consume pulverised solid fuels is fly ash. Owing to its morphological characteristics, physicochemical properties and pozzolanic activity, this residue has potential for use in the production of refractory insulating bricks in combination with clays, a binder (sodium silicate) and a foaming agent (hydrogen peroxide 50%). The bricks thus obtained present the appropriate characteristics of mechanical resistance, porosity and thermal conductivity.