Everybody has this problem, lots of possible ways it can be addressed.
Cold dry air helps make static electricity so warm up the room.
Wear rubber soled footwear, not plastic or leather.
Stand on a rubber mat.
Put a separate ground wire on your grinder. If necessary, get some braided wire hooked to a ground (either a real ground rod driven into the ground or a cold water pipe) and let the end of the wire brush against the belt as it runs.
Moisten the belt.
One of those things should help and there are probably many others....
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