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Metallurgical coal or coking coal [1] is a grade of coal that can be used to produce good-quality coke. Coke is an essential fuel and reactant in the blast furnace process for primary steelmaking . [ 2 ] [ 3 ] [ 4 ] The demand for metallurgical coal is highly coupled to the demand for steel.
Coking is the process of heating coal in the absence of oxygen to a temperature above 600 °C (1,112 °F) to drive off the volatile components of the raw coal, leaving behind a hard, strong, porous material with a high carbon content called coke. Coke is predominantly carbon.
At the time, coal was selling for about a quarter of the price of natural gas ($1.5 versus $5.0 per million BTU); however, the ratio has since become much smaller (as of 2010, coal has tripled in price to $4.63/mil BTU while gas is still at $5.189). [4] [6] (Natural gas is used as an alternative to thermal coal in electricity production.)
Today, Peak Downs has a production capacity of nine million tonnes of coking coal per annum. Saraji Mine located 24 km south of Peak Downs mine and 213 km south west of the Hay Point coal export terminal. Construction of the Saraji open-cut coking coal mine began in late 1972 and production began in the latter part of 1974.
As of 2020, coking coal in the U.S. sold for about $127/short ton, compared with $50.05/short ton for bituminous coal generally. The cost of coking coal is about 3.5 times as high as the cost of coal used for electrical power (which includes lower ranks of coal, such sub-bituminous coal and lignite, as well as noncoking bituminous coal.) [20]
China imported 54.7 million tonnes of coking coal - an essential ingredient in the production of steel - last year, down by 24.6 per cent from 2020, according to official data. "Even though demand ...
A coking factory or a coking plant is where coke and manufactured gas are synthesized from coal using a dry distillation process. The volatile components of the pyrolyzed coal, released by heating to a temperature of between 900°C and 1,400 °C, are generally drawn off and recovered. There are also coking plants where the released components ...
A coke oven at a smokeless fuel plant, Abercwmboi, South Wales, 1976. The industrial production of coke from coal is called coking. The coal is baked in an airless kiln, a "coke furnace" or "coking oven", at temperatures as high as 2,000 °C (3,600 °F) but usually around 1,000–1,100 °C (1,800–2,000 °F). [2]
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