I don't think that you can get the lead hot enough with a stove type burner to vaporize it, but you can get some pretty noxious fumes from the stuff mixed with the lead. I did caution a guy once that was going to cut a sailboat keel into more managable pieces with an oxy-acetylene torch that it might not be his wisest move. He wound up using a sawzall to good effect.
I wasn't sure about shadygrady's requirements, thanks rupe01.