Just a couple of thoughts.
One of the problems with the lead is it easily leaches when you touch it.
Grinding will not only put lead in the air but the fibers from the boards. The resulting dust would be toxic.
Circuit boards should be protected from the elements when stored. Rain on boards will leach the lead into the ground.
Like anything else, with the right precautions things should be ok.
Hope this is a helpful post.
Steve
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