I consulted in IT for ~10 years, and tried to take interesting jobs in interesting industries, after burning out in big healthcare. One of the more interesting gigs I took was working for a lead smelter!

They smelted all their lead from recycled materials, mostly batteries. That is why you get a relatively lot of money back for your used battery. They have ~15 customers and a LINE of more waiting if they could support the capacity.

Was a fun job, loved walking through the plant.