Meaning: The furnace of God's wrath. Hellfire.
Ezekiel 22:20
As they gather silver, and brass, and iron, and lead, and tin, into the midst of the furnace, to blow the fire upon it, to melt it; so will I gather you in mine anger and in my fury, and I will leave you there, and melt you.
Matthew 13:42
And shall cast them into a furnace of fire: there shall be wailing and gnashing of teeth.