If these are ceramic ect; and they are solid ;leave alone.
Depending on what you are going to replace them with;you could
screed over joints ect with floor compound .
If you have to lift them you could use a chisel or hire a small power tool
with a chisel point.;but even then you could be left with rough floor and
still have to screed.
I your going to lay a vinly you might cover with ply this you would have to be
fixed with rawlplugs/screws.
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You will need to sand the floor to give the thinset something to stick to.
No one likes his or her concrete floor to look like a dull, boring, gray floor. There are many things you can do with a concrete floor - you can install tile on top of it, you can carpet it, or you can paint it. All of these things can create many undesired issues, however. If you install carpet on your concrete floor and there happens to be any flood or water damage issues going on, eventually you will have mold growing underneath your carpet. So, as you can see, this option can create a definite health hazard. If you place tile on a concrete floor, there is always the chance that the tile won’t adhere to the concrete particularly well. Plus, if you ever decide to pull the tile up from the floor, the adhesive that is underneath the tile will be particularly hard to remove. Painting is another option, but paint can chip and wear quite easily if your concrete floor has heavy foot traffic on it. The best option, by far, is concrete staining for your concrete floor. Concrete staining does not have to be any more expensive, nor any more difficult than other methods of improving upon a concrete floor. Some people may choose to hire professionals to do such a staining project, while others want to attempt to complete the project themselves. You do not necessarily have to have experience to complete such a project, but you need a ton of patience to finish the floor. It may be worth it to you to have a professional stain the floor if you feel that you do not have the time or patience to complete the project. However, it is obviously going to be much cheaper to complete the concrete staining yourself. Overall, concrete staining can give your basement or other concrete floor a very elegant and finished look. It may be the best option you have when it comes to improving upon your concrete floor. Now is the time to choose the particular stain that you want for your floor. You can pick different stains, depending on how you want your floor to look.
Use petrol or paint tinner...
A finished concrete floor is generally less expensive than a slate or stone floor. A simple professionally poured concrete floor can average about $5.00 a square meter. An installed slate floor costs considerably more that concrete depending on the tile you choose and installation costs. Slate flooring is more expensive than concrete. Stamped concrete is also an option that looks nice but it is still less than slate.
wall tiles are used on walls. floor tiles are used on floors. if you want to interchange. you can make the wall tile as floor tile and vice-versa