| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method of porous light weight aggregates of fine particles ranging within 1000 to 100μm size, having high strength and low absorption level. SOLUTION: This production method of light weight ceramic particles comprises the steps of finely grinding volcanic glassy ore such as fire proof stone, pumiceous sand or liparite to average particle size under 10μm, adding a foaming agent and pelletizing to 1000 to 100μm size, and firing and foaming in a fluidizing bed kiln. Onto the pellet, a fusion inhibitor such as alumina is coated. Alternatively, the fusion inhibitor may be mixed with secondary air for burning. As a medium for the fluidizing bed, mullite with spherical shape is suitable. Maximum temperature zone at the firing is set in the region of free board area which locates above the fluidizing zone.
|
