It is used in some chemical reactions. I remember using it way back in Chem 101 for some reaction.
Historically it has been used for more mundane purposes such as adding color to pottery. And there are some modern uses such as in x-ray machines. But there are better substitutes that can’t also be turned into nuclear bombs. And depleted uranium for bullets is only gotten as a byproduct of separating it from its fissionable isotope.