The bellows are burned - Worn out by continual blowing. The prophet has exhausted all his efforts. His heart, consumed by the heat of divine inspiration, can labor no more. Others translate “The bellows snort,” i. e., blow furiously. More probably, “The bellows glow” with the strong heat of the fire.
Plucked away - Separated. The smelter’s object is to separate the metal from the dross.