SAM4CH - 8-10-2010 at 12:29
How to make a spherical ammonium perchlorate or granules?
Is it can be achieve by re-crystallization? 
what about spherical agglomeration technique? Is there any full text for this? 
Xenoid - 8-10-2010 at 12:50
I believe spherical granules are formed by spraying the hot saturated solution from the top of a tall cylindrical tower, up which, heated air is being
blown.
If you look up the industrial preparation of ammonium nitrate granules, you should find a fuller description of this process, it's fairly common.
It's not really suited to home use, as the towers need to be 20 - 30 metres tall.
ScienceSquirrel - 9-10-2010 at 11:51
All sorts of chemicals are made in to prills using this process.
They are more easily handled than crystals or fine powders that can pack or cake.
http://en.wikipedia.org/wiki/Prill