www.ireng.org Summary


An additive has been developed which stabilizes the setting time in relation to the temperature dependence that one typically observes for refractory castables. The setting behavior remains different as a function of the temperature, but the actual working and setting time that one obtains becomes more stable and predictable.


There is no negative impact on mechanical strength from the additive. Either on hot samples or cold samples after heat treatments. But there is potentially an improved strength in the intermediary temperature range even if this increased strength cannot be explained yet.


There is a positive impact on the ageing behavior of the model castable that was used, which becomes much more stable compared to the reference, over the 6 months period that was evaluated. This is attributed to the boosting effect of the additive.


Classic retarding additives where evaluated and it was concluded that several of the tested additives could be used for retarding a castable containing REFPAC 500 at 35°C.


Using the newly developed deflocculating active compound, one can expect a more stable and predictable behavior of alumina-spinel castables at different temperatures as well as over time.


Technical Paper and QuickShot Directory Acknowledgement


The authors thank all supporters to this study from the Kerneos Research Centers in Europe and Asia.


References 1. Parr C, Bin L, Alt C, Wöhrmeyer C. The impact of castable composition and calcium aluminate cement type on the rheology and mechanical properties of LCC at low ambient temperature. Institute


Refractory Engineers England, 2005.


2. Cardoso F, Innocentini M, Akiyoshi M, Pandolfelli V. Effect of curing conditions on the properties of ultra-low cement refractory castables. Refractory Applications and News, Volume 9, Number 2, 2004.


3.


Simonin F, Wöhrmeyer C, Parr C. A new method for assessing calcium aluminate cements UNITECR, Orlando, USA, 2005


4. McCormick M. Lithium spot price edge upward. Industrial Minerals, 29th April 2016.


5. Wöhrmeyer C, Simonin F, Li B, Li S, Gao S, Szepizdyn M. Castable pumping and shotcreting at extreme temperatures. EUROGRESS, Aachen, Germany, 2013.


annual Concerence, Rottenham,


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