| 摘要 |
PURPOSE:To obtain superior strength, shape and yield by coating the surface of a core material made of a combustible substance with a binder, sticking powdery refractory starting material to the core material, charging this core material and the residual powdery refractory starting material into a rotary granulator and shaping them while adding a binder. CONSTITUTION:The surface of a core material made of a combustible substance is coated with a binder and powdery refractory starting material is stuck to the core material. This core material and the residual powdery refractory starting material are charged into a rotary granulator with a rotating bottom plate and shaped while adding a binder. The resulting shaped core material is calcined to produce refractory hollow spheres. Since the coating layer on the surface of the core material is shaped and made dense, superior strength, shape and yield are obtd. |
