From Longman Dictionary of Contemporary Englishblast furnaceˈblast ˌfurnace noun [countable] TIHCMa large industrial structure in which iron is separated from the rock that surrounds it
Examples from the Corpus
blast furnace• I haven't got a snowflake's chance in a blast furnace with Helen while he's around.• Traditionally, iron oxide is converted to the metal in a blast furnace. 