A The production of ceramic foundry sand takes high-quality bauxite as raw material, after calcination, arc furnace melting and high-pressure gas injection to obtain spherical or nearly spherical sand particles with smooth surface, and then through screening, magnetic separation cleaning, mix matching and other processes, it becomes a new multi-functional material. It has the characteristics of high fire resistance, low thermal expansion rate, good thermal stability and strong collapsibility. It can be recycled and reused, green and cost-effective,meanwhile the products have plenty applications in refractory and polishing industries, such as ladle drainage sand, oil sand, hot light cleaning of aluminum parts, etc.