While it is possible to sand concrete, both ceramic and aluminum oxide sandpaper are less than ideal for concrete sanding. Ideally, you want to use diamond sanding or polishing pads.
Safety goggles, Gloves, Dust mask, Ear protection, Liquid chemical hardener, A grinder or polisher, Diamond cup grinder wheel, Diamond polishing pads, Diamond hand sanding pads
If the concrete has cracks or holes in the surface you may want to fill these in with some crack filler. he next thing to consider is the hardness of your concrete surface.
Depending on the size of the job and your budget you may want to consider hiring a concrete grinding machine. These machines are very effective but can be expensive.
If you have to sand concrete indoors, you may want to remove all the items from the room or use drop cloths or plastic sheeting for protection from dust and debris.