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No, for two reasons.
1. Egg shells are just not hard enough to grind much of anything else up. They will not work as grit. Same with oyster shell. Oyster shell does not work as grit with much of anything. The chicken's digestive tract has acid in it, just like humans, and that...
I provide grit at three days age, but I just gather coarse sand from the run and put it in the brooder. You can probably sift through that stuff and just give them the smaller bits or you can crush it to sand-sized pieces. Other than things like yogurt or boiled eggs, they should get grit...