CO-resistant refractory materials
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I would like to understand how CO-resistant refractory materials resist the erosion of CO, and what are the chemical principles behind this. Also, is the high-load brick due to a higher content of alumina in it?
It’s not clear what type of thermal equipment it is used in; different materials have different mechanisms for resisting CO.
Refractory materials resistant to CO are primarily selected based on their weak acidity and reducibility; acidic refractory materials can be used, with corundum bricks (including corundum castables) being those of good performance； The common choices are high-alumina bricks (including high-alumina castables) and mullite bricks ； Lower ones include clay bricks, etc.
The heat-resistant linings of current industrial furnaces are mostly made of refractory materials based on aluminum oxide (Al2O3), with varying amounts of silicon dioxide (SiO2) added. Choose between clay bricks, high-alumina bricks, or corundum castables depending on factors such as temperature levels and wear resistance requirements. Carbon monoxide does not undergo a chemical reaction with aluminum oxide (Al2O3) and silicon dioxide (SiO2); therefore, it causes no significant erosion of the lining.
Refractory materials are classified into acidic, neutral, and alkaline types. It is recommended to use acidic refractory materials, such as silica bricks and clay refractory bricks, whose main components are tetravalent oxides like SiO2 and ZrO2, giving them good resistance to acidic substances.