Abstract

Refractory products made from CaOCaCl 2 mixtures precalcined at low temperatures have shown a specific volume stability on further firing to 1500°C and higher, in contrast to their equivalents of pure CaO, MgO, or MgOCaCl 2. This phenomenon was studied using simplified systems, including some additives specially chosen; an explanation is offered based on shrinkage data and the observed development of a unique microstructure, resulting from an early formation of a reactive liquid as well as gas evolution effects. The non-shrinking behaviour of the so-called calcite brick (made from ground limestone masses containing CaCl 2) is also dealt with.

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