šahtahi peamiselt malmi sulatamiseks rauamaagist; kasutatakse samuti vase, plii, tina, tsingi jt metallide saamiseks maagist (vt kõrgahjuprotsess)
a shaft furnace in which solid fuel is burned with an air blast to smelt ore in a continuous operation (see: blast-furnace process)
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Where the termperature must be high, as in the production of pig iron, the air is preheated; where the temperature can be lower, as in smelting of copper, lead, and tin ores, a smaller furnace is economical, and preheating of the blast is not required.
