Quote Originally Posted by NHscrapman View Post
Lead, is dried and then treated using pyrometallurgy. The concentrate is sintered before being smelted in to produce a 97% Lead concentrate. The Lead is then cooled in stages which causes the lighter impurites (dross) to rise to the surface where they can be removed. The molten Lead bullion is then refined by additional smelting with air being passed over the Lead to form a slag layer containing any remaining impurities and producing 99.9% pure Lead.
this site could be of some use keep on learning
Secondary Lead Production, Secondary Smelting, Secondary Lead Refining

Pyrometallurgy - Wikipedia, the free encyclopedia

Sintering - Wikipedia, the free encyclopedia

If I put the sponge lead in a blender
and blended charcoal and some carbon from Vac Motor Brushes and chopped together be interesting to see if some of the sponge lead becomes metallic lead
on youtube it does look like the lead is Sintered