blast furnace

noun2

1. •
   An industrial furnace in which ore is smelted to metal, the process being intensified by a blast of hot air.

   • Just before Bloworth Crossing, you'll walk a short distance along the trackbed of the old mineral railway that connected the old ironstone mines at Rosedale with the blast furnaces of Middlesbrough. — 2019
2. •
   As above, but specifically such a furnace where the fuel and the ore are intermixed, as for example when coke and iron ore are burned together.