what is zirconiums safety issues?

Answer 1

Zirconium isn't particularly toxic, but its dust can catch on fire and be potentially explosive.

Answer 2

Correct. Zirconium is non toxic but it burns with a very hot flame, especially in the form of dust or thin sheet or wire. The old-fashioned flashbulbs that you could only use once consisted of zirconium wire inoxygen.

Answer 3

look up the MSDS, or material safety data sheet.