| 摘要 |
Size-enlarged sludge particles 12 having nuclei of objective particles and having a particle size in a range of from 1 mum inclusive to 2000 mum exclusive are mixed with slurry containing fine alumina powder so that a mixture is prepared. Then, the mixture is dried by removal of the water content in the mixture. Then, the mixture is baked at a temperature in a range of from 1200° C. to 1500° C. so that alumina on surfaces of the size-enlarged sludge particles 12 are sintered. By the aforementioned method, light-weight alumina particles can be produced with the particle size controlled well to a uniform value. |
