I'm pretty sure that is next to impossible. Blackholes need infinite energy to sustain themselves. The particles used in the super collider is insanely small and last merely femtosecond or maybe a bit longer. Also, the particles are collided within a vacuum so even if a micro blackhole formed within there's no amount of material for it to "consume" for any length of time to grow. And before you say "it can eat the lining of the collider and grow up dude!!" consider that it takes an "infinite" amount of energy for it to sustain itself. Only the death of a giant star or surrounding matter in space can provide that kind of energy.
So don't worry. We have a higher chance of being obliterated by a rogue asteroid or comet or a nuclear detonation or world war than a micro blackhole through our experiments.