You don't think superheated molten steel could stay hot for months but smoldering fires can.
No. Not even a little bit, and that is almost a stupid statement.
A smoldering fire will continue to burn if there is a fuel, a heat source, and oxygen. Forever. And ever. As long as the 3 things in the fire triangle are maintained, it will literally burn forever. Until the end of time.
However, if you take a piece of metal, heat it to 3000 deg. F, and allow the heat source to be removed, it will cool very fast.
As an asside, the hotter a metal object is, the quicker it cools. Something about the laws of thermodynamics or something like that......
The superheated metal heated the dust around it, slowly igniting it dispersed combustibles which in turn created more heat that slowed the cooling of the molten metal.
Wow, that's just assinine. Sorry.
But that is a diversion from the reality that dropping tons of debris on a fire will put it out.
Really? Prove it. Take a one acre hydrocarbon fire, and drop 100 tons of building materials on it, and tell me what happens.
I'll never correct you again if you do it, film it, and put it on youtube.
Furthermore, pulverizing the burning material and mixing it with a lot on noncombustible spreads out the heat, lowering the temperature. Try throwing a lot of busted up concrete on a bonfire and mixing it up.
I've done it. It just makes the rocks hot.
Imagine that. HotRocks......
Perhaps you should stick to things you completely understand, like television shows or something.