Save the queen, aw hell no!

I've been battling fire ants for what feels like ten years now. I finally found some good stuff to kill them, but it only partially works. And the bad part it that it smells like pure crap, rotten eggs, sweat and beer farts all rolled into one disgusting odor. What has been happening as of late is that I sprinkle the white nasty powder on a huge ant hill that mysteriously appeared overnight. Then I watch the worker ants slowly die. Then a few days later, no more ants. Then a day or so later, damn, another ant hill a few feet away. So what I'm wondering is if the queen counts her workers and if a large enough quantity do not return from their daily duties, she tells the whole colony to pick up and move. So yes, a queen in any other sense should be saved, but I'm ready to kill this bitch!