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In a practical sense, making lead hot won't break it down. But I wonder if there is any temperature where lead would stop being lead and continue to not be lead after the results cool down again?
Alchemy! Now this is the out-of-the-box thinking that I like!
In all seriousness, lead is lead because it's made of lead atoms. It can't not be lead. (The reference to alchemy was because before we knew about atoms, many alchemists tried their hand at turning low-value metals like lead into high-value metals like gold).
To answer your question in a silly but scientifically accurate way, there is a temperature to which lead can be heated to become something else, but these are nuclear fusion temperatures, like you get in the Sun.
Much higher than the sun, unless you're also adding the pressure of a star.
My mother is busy sitting on something else that afternoon
Magnetic fields should be able to extract lead.
How would that work? You gonna ionise the lead? 🤔
Why would that be necessary? Does led not react to magnetic fields?
Very few metals do!
Lead does not.
Edit. Here's a list of things you can pickup with a magnet.
https://en.m.wikipedia.org/wiki/Category:Ferromagnetic_materials
Well... The Large Hadron Collider can smash lead nuclei together at nearly the speed of light, which turns them into something that is definitely no longer lead.
Lead being an element means you would either need to make it radioactively decay somehow(which I'm not sure any form of lead is want to do) or perform some kind of alchemy.
Artificial elemental transmutation of lead into other elements is not just fantasy, it's entirely possible and happens in particle accelerators and nuclear reactors. It's just extremely impractical as it's an extremely slow process at anywhere near the particle fluxes we can practically achieve. Plutonium is made through a similar process (though the exact mechanism used to produce plutonium is relatively more efficient) as well as small quantities of useful radioisotopes, but it is also possible with lead.
https://en.m.wikipedia.org/wiki/Nuclear_transmutation