Which chemical materials are found in acidic refractories?

Acidic refractories are primarily characterized by their chemical composition, which consists of silica ($Si{O}_2$) or zirconia ($Zr{O}_2$).1

Specific materials used in this category include:

• Silica refractories: These are manufactured from quartzite and silica gravel deposits, often chemically bonded with small amounts of lime.2
• Zirconia materials: These are utilized for their high resistance to chemical attack, particularly in environments involving molten glass.31

While fireclay materials are often described as being fairly inert in acidic environments, they are distinct from the primary acidic refractories defined by their silica or zirconia content.41