29 The bellows blow fiercely to burn away the lead with fire, but the refining goes on in vain; the wicked are not purged out.

Read Jeremiah 6:29 Using Other Translations

The bellows are burned, the lead is consumed of the fire; the founder melteth in vain: for the wicked are not plucked away.
The bellows blow fiercely; the lead is consumed by the fire; in vain the refining goes on, for the wicked are not removed.
The bellows fiercely fan the flames to burn out the corruption. But it does not purify them, for the wickedness remains.