China's Refractories

Abstract: The ceramic setting binders obtained by means of the raw mix mechano-chemical processing (mechanical dispersion and chemical interaction processes combination), used for bonding refractory concretes, become more available with a subsequent increased interest in their properties because they develop initial strength during a heat up of the units within 8-10 h, in contrast to 24 h after placement for high Al2O3 cements (HAC). This strength development enables high temperature processing units to be relined with minimum turnaround time, thus providing a favored cost/performance ratio. The present paper identifies the predominant phosphate phases responsible for developing good mechanical-strength properties of zirconia and alumina concretes bonded with mechano-chemical binders. It sets out the colloid and crystalline phases resulted from interphase interaction that provide the basis for high concentrated bonding suspensions (HCBS) technology useful to the refractory industry.

Key words: refractory concrete, ceramic setting binder, mechano-chemical binder, binding suspension, bending and compressive strength, lining