Fire Ants in Compost Heap

Thanks. I try to turn it every day, but was only turning it once a week or so.

Burn them

Don't put ant poison on the compost heap.
The ants are helping to break down the contents of your pile. Turning the pile will encourage them to move on, and you can poison the piles that show up in your yard.

The ants will move up into a pile when the ground is wet/saturated, and in colder weather (pile is warm due to decay). They will usually move on if continually disturbed.

I read that coffee grinds will make ants move.
I now save my coffee grinds and spread them on ant piles that pop up. The ants are gone in day or two. Don’t think it kills them, they just don’t like it and they move on.
Use this in my raised bed garden, flower beds and in the yard.
And it’s good for the soil.

I was surprised at how quickly onion makes fire ants move. Just a thin slice or 2 on the top of the hill and next day they've moved.