How are chemicals prilled?

What does the process of prilling something like, say, calcium nitrate, involve? Do you need other chemicals to prill the substance?

• en.wikipedia.org/wiki/Prill – Mithoron Aug 13 '15 at 0:01
• @Mithoron I saw the Wikipedia article already, although it's nice to link for reference. I didn't see any mention of whether other chemicals are required to make the process possible, however (for instance, anything else besides calcium nitrate). – Shule Aug 14 '15 at 2:24