Investigation of slag containing refractory materials for gasification processes

In gasification processes the reaction of carbon feedstocks with oxygen and water leads to production of synthetic gas. The development of a new gasification technique reduces the temperature at the liner wall in the range of 1300 °C. Thus, the currently used high chrome oxide based materials can be replaced by new chrome oxide free materials fulfilling economical as well as ecological aspects. In this contribution the performance of alumina castables with different brown coal ash-contents (slag containing refractory materials) and sintered in different atmospheres have been investigated according to their thermo-mechanical properties, phase formation as well as resistance against thermal shock and corrosion attack under gasification-similar conditions. The slag containing refractory material with 11 wt.% brown coal ash sintered in reducing atmosphere has shown the best results with regard to mechanical properties and corrosion resistance and will be a promising liner material for gasification processes up to 1400 °C.