Authors:
Laura Erbar | Koblenz University of Applied Sciences | Germany
Katharina Sarnow | Koblenz University of Applied Sciences | Germany
Prof. Dr. rer. nat. Olaf Krause | Koblenz University of Applied Sciences | Germany
Dr. Erwan Brochen | Forschungsgemeinschaft Feuerfest e. V. at the European Centre for Refractories | Germany
Michael Kaminski | Forschungsgemeinschaft Feuerfest e. V. at the European Centre for Refractories | Germany
Dr. Christian Dannert | Forschungsgemeinschaft Feuerfest e. V. at the European Centre for Refractories | Germany
Dr. habil. Jacek Podwórny | Łukasiewicz - Institute of Ceramics and Building Materials | Poland
Dr. Karolina Dudek | Łukasiewicz - Institute of Ceramics and Building Materials | Poland
Dr. Magdalena Kujawa | Łukasiewicz - Institute of Ceramics and Building Materials | Poland
Dr. Robert Kusiorowski | Łukasiewicz - Institute of Ceramics and Building Materials | Poland
Forced by economic, ecologic or even legal causes, refractory producers want to, need or must increase the use of secondary raw materials. It is unclear, however, how impurities which are being carried over into refractory materials from secondary raw materials influence the behavior of those refractory materials, either during the processing state or during their use in high temperature environments.
The objective of this paper is to increase the knowledge about the influence of small amounts of impurities (2 wt.-%) from secondary raw materials onto the processing behavior (workability, setting, hardening) and will show first results how these impurities influence the high temperature fracture behavior of cement-free monolithics.
The research was carried out using a primary high alumina raw material that was selectively “impurified” using typical elements found in secondary raw materials. Those artificially spiked raw materials were processed into monolithics by 1:1 substitution of the corresponding high alumina fraction in the recipe.