| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a new production method capable of obtaining a shirasu balloon having the high sphericity and the high pressure resistance by one-time calcination even if using any shirasu raw ore recovered from nature. Ž<P>SOLUTION: A residual part after a heavy ore component is removed from the shirasu raw ore, is supplied to an impact treatment in a high-speed air flow to be crushed, thereafter sieved so that an optional division of the particle diameter in the range of 20-150 μm is recovered, and calcined at 900-1,150°C. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
