How is metallurgical coal formed?
Met coal is heated above 1,000ºC in a coking oven to create coke – a hard, porous lump. The coke is then added to a blast furnace with iron ore. Hot air and PCI are introduced, creating a flame temperature over 2,000ºC.
Which coal is used as metallurgical fuel?
Coking coal, also known as metallurgical coal, is used to create coke, one of the key irreplaceable inputs for the production of steel. There are many varieties of coal in the world, ranging from brown coal or lignite to anthracite.
Is coke obtained from coal?
Coke is produced by heating coal at high temperatures, for long periods of time. This heating is called “thermal distillation” or “pyrolysis.” In order to produce coke that will be used in blast furnaces, coal is usually thermally distilled for 15 to 18 hours, but the process can take up to 36 hours.
What are the major types of coal?
Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.
Is coal used for steel?
Coal and coke
Coking coal is a key raw material in steel production. As iron occurs only as iron oxides in the earth’s crust, the ores must be converted, or ‘reduced’, using carbon. The primary source of this carbon is coking coal.
Do we need coking coal?
It is a myth that steel production requires coking coal. A third of global steel today is made without coking coal, either through scrap recycling or gas-based steel production; and counting.
Is there an alternative to metallurgical coal?
Blast furnaces need coal, but there is an alternative technology called an Electric Arc Furnace (EAF). This is responsible for approximately 30% of the world’s steel production and does not require coal.
What is the difference between coal and coke?
Coal is a lustrous, black fossil fuel that includes impurities, generates smoke, and generates less heat than coke when burned. Coke is a dingy, black coal waste that burns hotter and cleaner. … Coke is a fuel made from mineral coal that has been calcined or dry distilled.