As for melting I would suggest Getting a 5 qt cast iron dutch oven. Your just going to need to hack into chunks small enough to fit. if the lead is that soft you might be able to to it with an axe. To harden it you need antimony and tin. DO NOT USE ZINC! You will need one of those propane buners like you see used for a turkey cooker. it's going to take a lot of BTUs to melt that lead.
I use parafin as a flux.
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