Black Holes need matter to consume in order to "survive". Once there is no matter falling into the singularity, the black hole "evaporates". Scientists at CERN have actually created momentary artificial singularities, if I'm not mistaken. They are extremely small and only last a split second.
No black holes have been created at CERN. Theory says they could be created if certain conditions hold (like the universe has extra dimensions of space). But nothing like this has been confirmed.
Also, black hole evaporation is still only a theory. No proof yet.