It is because it is not eco friendly
It is 96% iron (the rest is mostly sulphur etc.).
That iron is too brittle.
The iron produced by a blast furnace is typically referred to as pig iron. It is a crude form of iron with high carbon content, which needs to be further processed to remove impurities and adjust its carbon content before it can be used in various applications.
Pig iron is produced when heating * Iron ORE (not iron as the question says!) * Coke * limestone in a Blast Furnace.
A blast furnace is used to extract iron from its ore.
In essence nothing, a Cupola furnace is a type of blast furnace in that it is charged at the top and tapped at the bottom and air is blasted into the furnace via a wind belt and tuyres. A blast furnace in a steel works is a huge structure operated for long periods of time, it is charged with iron ore, coke and limestone and reduces the iron ore into pure iron. A Cupola furnace, as used in the foundry re melts pig iron, from the blast furnace, along with foundry scrap, steel scrap and scrap iron engine blocks and produced iron alloys of various specifications. A Cupola furnace is usually operated on a daily basis but some types can be continuously operated for several weeks
blast furnace
through the top of the blast furnace
Iron is primarily extracted from iron ore in a blast furnace at an iron and steel plant. The iron ore is first processed into iron oxide, which is then reduced to metallic iron using carbon as a reducing agent in the blast furnace.
Direct Reduced Iron (DRI) is considered superior to blast furnace iron because it is produced through a process that involves reducing iron ore without melting it, resulting in a purer form of iron with lower impurities. DRI also has higher iron content and can be produced using natural gas, making it more environmentally friendly compared to blast furnace iron production. Additionally, DRI can be used in electric arc furnaces, providing more flexibility in steelmaking processes.
Iron ore is used in a blast furnace as a raw material for producing iron. It is the primary source of iron, which is essential for the production of steel. The iron ore undergoes a series of chemical reactions in the blast furnace, resulting in the extraction of molten iron.
Coal is unsuitable for charging directly into a blast furnace because it contains impurities like sulfur and ash that can negatively affect the quality of the iron produced. When coal is used as a fuel in the blast furnace, it can lead to increased levels of impurities in the iron, affecting its properties. As a result, coke, which is a cleaner form of coal, is typically used in blast furnaces for iron production.