'Furnace' in the Bible

"Son of Man, Israel has become like dross to me. All of them are like remnants of bronze, tin, iron, and lead in a furnace the dross left over from smelting silver.

just like a smelter gathers all the silver, bronze, lead, and tin to the center of a furnace and injects fire in order to melt it, I'm going to gather you in my anger and rage, make you settle down and then I'm going to melt you down.

like melting silver at the center of a furnace. When you've been melted from the center out, then you'll know that I am the LORD. I'll pour out my anger on you.'"