One of the mysteries of the English language finally explained.
A smelting furnace in the form of a tower into which a blast of hot compressed air can be introduced from below. Such furnaces are used chiefly to make iron from a mixture of iron ore, coke, and limestone.
- ‘The roasting process uses oxygen in a blast furnace to convert the metal sulfide into the metal or the metal oxide plus sulfur dioxide.’
- ‘The explosion occurred when molten iron leaked from a blast furnace.’
- ‘It was extremely hot, like standing in front of a blast furnace at a steel works.’
- ‘At last it was now possible to use the gas, which was produced by the blast furnace in gigantic quantities in the process of smelting iron, to drive engines.’
- ‘The traditional method for extracting pure iron from its ore is to heat the ore in a blast furnace with limestone and coke.’
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