Limestone is a soft sedimentary rock in which calcium carbonate is present. Limestone is derived from fossil deposits of marine animals and is often a buff or off-white color. It is possible to sand limestone, but only professionals should do so. If you have no experience in working with limestone you need to hire a professional to do this work, because there is a big chance that you will dull the stone.
Use water to cool down the limestone and lubricate the stone before starting the sanding process. Limestone is extremely sensitive to acid-based cleaners, so it is important to just use water. Using any other cleaner could damage the limestone.
Use sheet-mounted diamond pads and an orbital sander to sand the limestone. This is a very delicate process and because of the softness of limestone, it is important not to put too much pressure on the sander.
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Clean the surface with water to get rid off the sanded limestone.
Do not use acid-based cleaners to clean limestone.