Peculiarities of glass ceramics formation from red clay-cullet-waste activated sludge-hematite mixtures

Abstract

In the work, an analysis of the phase formation process proceeding in a quaternary red clay-low-melting cullet-iron oxide (Fe2O3)-WAS (waste activated sludge) system in treatment at 1000oC in air has been performed. It has been established that, in sintering of the mixtures, porous ceramics consisting of a glass phase alloyed with iron ions with inclusions of cristobalite, iron-containing silicates of complex composition, α-Fe2O3, and an insignificant amount of Fe3O4 forms. The porous glass ceramics meets the compressive strength requirements imposed on building bricks.

Keywords

• red clay
• cullet
• fe2o3
• sintering
• glass ceramics