Best way to remove Mortar from ceramic tile

[Kimber]

I have ceramic tile that has lifted due to tenting. I want to remove the mortar from the underside so I can reuse the tile.

I have a 10 x 8 feet section to remove clean and recement down. I heard you can soak the tile in water to soften the mortar, but this is not the case.
Chipping away at it is too hard, a Dremel tool gets overheated.

The grout is easy to remove with a hand tool and/or Dremel tool.
Any suggestions? What is the easiest way to remove the mortar?
Thanks for the help

 

[Dave]

A grinder with a diamond cup wheel.

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