You can chisel away this area with a hand chisel and hammer and it should break the concrete easily.
Removing toilet flange concrete floor.
Pick up the toilet again bending at the knees and not the back.
If the pipes are glued together then you should be able to use solvents to break the bond.
When removing the toilet flange the methods used will vary depending on the type of material your flange is made from.
If using a plastic flange ring be careful not to crack the ring by screwing the anchors in too far.
Do this before you try and take up the whole pan with an sds drill if you want to give that a go.
If it doesnt come off easily then the whole pan would need to be broken up.
Step 5 clean up around the bottom of the toilet and place the new wax ring on the repaired flange.
1 shut off the water to the toilet disconnect the supply hose from the toilet.
The floor waste would have a rubber seal under the concrete therefore i would assume the concrete is thin.
Then remove the toilet by disconnecting the hoses and.
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Screw the toilet flange onto the concrete use tapcon anchors or a similar type of masonry concrete screws to fasten the toilet flange to the concrete slab.
A special drill attachment further simplifies the task by eliminating the need to cut the flange from under the floor.
Slip the repair flange spanner under the broken toilet flange but put one of the toilet bolts through the hole in the spanner first in order to easily reinstall the toilet.
Fix the toilet flange on concrete floor.
With the toilet flange in place you are ready to install the toilet with a new wax ring.