Help your students learn to control their blurting!
For a student that struggles to raise their hand before they shout out, try Blurt Cards! That particular child can start the day with a certain number of Blurt Cards (say, 1, 2, or 3) and any time that they blurt out without getting a teacher's attention appropriately, they bring you one card. If they blurt out and have already used all of their cards for the day, then there will be a predetermined consequence.
Oftentimes Blurt Cards work for even the most disruptive blurters!