Sodium aluminum oxide, commonly known as sodium aluminate (NaAlO₂), is a key intermediate in the Bayer process for producing alumina from bauxite. It is widely used in water and wastewater treatment as a coagulant aid to promote flocculation and sedimentation of suspended solids, aiding in purification.

In the paper and pulp industry, it improves the retention of fillers, fibers, and additives, enhancing paper quality and reducing waste. In ceramics manufacturing, it functions as a deflocculant to adjust the viscosity of clay slips, facilitating casting and molding processes.

Additionally, it serves as a raw material in the production of zeolites, molecular sieves, and alumina-based catalysts. Its alkaline properties make it useful for pH adjustment in various industrial applications, including textile processing and effluent treatment.