Ezekiel 22:20

As they gather silver, and brass, and iron, and lead, and tin into the midst of the furnace, the baser metals being mixed with the precious and the object being to separate them, to blow the fire upon it, to melt it, the process resulting in an almost pure extraction of the nobler metal, so will I gather you in Mine anger and in My fury, in carrying out the contemplated judgment upon Jerusalem and Judah, and I will leave you there and melt you. Note that the process of refining is not used in the figure, the smelting as such being a picture of the avenging wrath of God.