Hi, I have two Barred Rocks a Black Australorp and a Black Sex link all sitting, They have been at it for a while now, I took all there eggs away that didn't hatch and they are stilling trying to get the Pine Shavings to hatch I guess.
To break their broodiness put them in a wire cage with only food and water for a few days. It usually takes around 3-4 days, using this method. Or, if you'd like them to raise some chicks for you, you could buy some 1-2 day old chicks and slip them under the hens at night while they are sleepy. They are more likely to accept them this way.
Yes, they will stay brooder even if you take the eggs away. What a lot of folks do and what I have done is remove the broody hen from the coop and put her in a separate pen/cage with her food and water. A suspended wire floor is recommended so she can't built up that heat that is required for incubating and hatching. That seems to break the "broody spell." Might take a few days. I have a special broody buster cage built that I break out for such occasions. My Buff Orps go broody 3 or 4 times per year. Good luck to you!