Floating beads are fly ash hollow balls that can float on the water surface. They are gray-white, thin and hollow, and light in weight. The bulk density is 720kg/m3 (heavy), 418.8kg/m3 (light), and the particle size is about 0.1 mm, the surface is closed and smooth, the thermal conductivity is small, and the refractoriness is ≥1610℃. The chemical composition of the floating beads is mainly silicon dioxide and aluminum oxide. It has many characteristics such as fine particles, hollow, light weight, high strength, wear resistance, high temperature resistance, thermal insulation, insulation and flame retardant. It is widely used in One of the raw materials for the refractory industry.