Definition

Noun: A tall, cylindrical industrial furnace used for the continuous smelting of iron from its ores (primarily iron oxides). The process involves superheating the ore with coke (a fuel derived from coal) and limestone, with combustion intensified by a powerful, continuous blast of preheated air forced into the lower section of the furnace. This process produces molten iron (pig iron) and slag as a byproduct.

Usage

The term "blast furnace" is used to refer to the specific industrial structure central to primary iron production. It is a count noun. - The steel mill's blast furnace operates 24 hours a day. - Modern blast furnaces are highly efficient and computer-controlled. - Iron ore is loaded into the top of the blast furnace.

Examples

• The company invested millions to reline its aging blast furnace.
• Molten iron is tapped from the bottom of the blast furnace.
• The blast furnace requires a constant supply of coke, ore, and limestone.

Advanced Usage

• "Blast furnace operation/technology": Refers to the engineering and processes involved in running a blast furnace.
  • Advances in blast furnace technology have reduced carbon emissions.
• "Blast furnace gas": Refers to the gaseous byproduct (rich in carbon monoxide) produced during smelting, which is often captured and used as a fuel.
  • The plant uses blast furnace gas to generate electricity.

Variants and Related Words

• Furnace (n): A general term for an enclosed structure for intense heating. A blast furnace is a specific type of furnace.
• Smelter (n): A facility or furnace for extracting metal from ore by melting. A blast furnace is a type of smelter for iron.
• Ironmaking (n): The overall process of producing iron, for which the blast furnace is the core unit.

Synonyms

• Iron smelting furnace: A more descriptive synonym.
• Shaft furnace: Describes the general shape and operation, though this term can apply to other metallurgical processes.

Related Phrases/Compounds

• Blast furnace slag: The stony waste matter separated from metals during the smelting process in a blast furnace.
  • Blast furnace slag is often used in cement production.
• Blast furnace hearth: The bottom section of the furnace where molten iron and slag collect.
• Blast furnace campaign: The operational lifespan of a blast furnace lining between major repairs.

Noun

1. a furnace for smelting of iron from iron oxide ores; combustion is intensified by a blast of air