A MINERAL BASED ACTIVE COMPOUND WITH TEMPERATURE STABILIZING EFFECT ON SETTING PROPERTIES IN ALUMINA-SPINEL CASTABLES

摘要

Setting behavior of calcium aluminate cement based refractory castables usually vary with temperature. Commonly, setting times for deflocculated castables can be excessively long at low temperatures, and inversely, too short at high temperatures. This leads to various difficulties at work sites as well as in manufacturing of refractory pre-shaped blocks. In this paper, a mineral based deflocculating active compound for use in calcium magnesium aluminate bonded castables is evaluated. By use of ultrasonic measurements, the reaction kinetics of different compositions are evaluated across the temperature range 5°C to 35°C with the aim to obtain a stable setting behavior across the complete range.