Na2CO3–Na2SO4 corrosion resistance of mullite castables

• DOI: 10.1111/jace.20463
• Publication Date: 2025-03-12T13:20:46Z
• Authors: Chunfeng Liu; Guoqing Xiao; Cailian Chen; Biqiang Xie; Donghai Ding; Changkun Lei; Christopher Parr; Christoph Wöhrmeyer
• Keywords: Mullite

Abstract Mullite castables, employed as the lining materials in high‐salinity organic waste liquids incinerators, are subjected to severe alkali attack. The corrosion resistance of four types mullite castables based on Mullite60 (M60), Mullite45 (M45), Fire clay (FC), and Glass‐rich (GRM) materials, named CM60, CM45, CFC, CGRM respectively, was investigated using a static crucible testing method with Na 2 CO 3 SO 4 under 1100°C this study. results showed that demonstrated exceptional . Among these kinds GRM stood out it not only contained 54 wt.% but also unique glass phase filled voids interwoven crystals. within aggregates provided protective barrier against for crystals by maintaining an adequate liquid phase. This micropores, resulting extremely dense layer. high content viscosity formed matrix during attack further impeded penetration, thereby exhibited good alkaline slag corrosion. However, M60, M45, FC vulnerably corroded due lack enough then led formation products including nepheline, lazurite, 1.65 Al Si 0.35 O , which induced internal stress finally resulted surface cracking crucibles. Moreover, presence cristobalite CM45 CFC promoted cracks propagation transformation. large pores exacerbated CFC. Therefore, containing glass‐rich have great application prospects enhancing slags.