Rajan Wilcox
Bituminous coal, also known as black coal, is a type of coal that contains a tar-like substance called bitumen. It is a fossil fuel formed from sub-bituminous coal under high heat and pressure and is typically between 100 million and 300 million years old. It is primarily used for electrical power generation and in the steel industry. Bituminous coal is the most abundant rank of coal, with deposits found worldwide.
| Characteristics | Values |
|---|---|
| Type | Fossil fuel |
| Colour | Black or dark brown |
| Composition | Carbon, hydrogen, oxygen, nitrogen, sulfur |
| Carbon content | 45-86% |
| Vitrinite reflectance | 0.5-1.9 |
| Density | 1346 kg/m3 (bank density), up to 833 kg/m3 (bulk density) |
| Age | 100-300 million years old |
| Uses | Electricity generation, steelmaking, coking, smelting |
| Hazards | Releases firedamp, a dangerous mixture of gases |
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What You'll Learn
Bituminous coal is a fossil fuel used for electricity generation
Bituminous coal, also known as black coal, is a fossil fuel primarily used for electricity generation and steelmaking. It is a middle-rank coal, with a higher rank than sub-bituminous coal but a lower rank than anthracite. Bituminous coal is composed of a significant amount of carbon, typically ranging from 45% to 86%. It is formed from sub-bituminous coal that is subjected to high temperatures and pressure, resulting in the presence of bitumen or asphalt, giving it its characteristic dark brown to black colour.
Bituminous coal is a vital fuel source for electricity generation, particularly in the United States. In 2019, about 23% of all electricity in the United States was generated using bituminous coal, alongside subbituminous coal or lignite, in coal-fired power plants. The combustion of these coals produces heat, which is utilised to convert water into high-pressure steam. This steam drives a turbine, ultimately generating electricity.
The use of bituminous coal for electricity generation has been associated with safety concerns due to the release of firedamp, a dangerous mixture of gases that can lead to underground explosions. As a result, stringent safety procedures are necessary during the extraction process, including vigilant gas monitoring, adequate ventilation, and meticulous site management.
In addition to electricity generation, bituminous coal is an essential raw material for the production of coking coal, which is used in the iron and steel industry. Coking coal, also known as metallurgical coal, must have low sulfur and phosphorus content. It is worth noting that coking coal commands a higher price than other grades of bituminous coal used for energy production.
Bituminous coal has been extensively used for various purposes throughout history, including home heating in the United States. However, it is considered a relatively dirty fuel, and efforts have been made to reduce its use, resulting in significant health benefits. Currently, research is being conducted on the bioconversion of bituminous coal to methane as part of the exploration of clean coal technology.
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It is also used in the steel industry
Bituminous coal is indeed a fossil fuel. It is a type of coal that contains a tar-like substance called bitumen or asphalt. It is typically hard but friable, with a black or dark brown colour. Bituminous coal is the most abundant rank of coal, with deposits found worldwide. It is primarily used for electrical power generation and in the steel industry.
Bituminous Coal in the Steel Industry
Bituminous coal is used in the steel industry due to its ability to produce good-quality coke, a fuel and reactant essential in primary steelmaking processes. The suitability of coal for conversion into coke, also known as its caking or coking ability, depends on its rank and physical properties. Coke provides the necessary heat and fuel for the blast furnace process, where hot air is blown into a mixture of coke, iron ore, and fluxes. This high temperature, reaching 1,700 degrees Celsius, oxidizes impurities, reducing the carbon content by 90% and resulting in molten iron. This molten iron is then further processed in a basic oxygen furnace with scrap steel and limestone to create new steel.
The quality of the coke produced is influenced by the properties of the initial input coal. Coke makers often blend various grades of coal to ensure a consistent product for steelmakers. Approximately 1.5 metric tons of metallurgical-grade bituminous coal are required to produce 1 metric ton of coke, and about 630 kilograms of coke are needed to produce 1 metric ton of steel. The blast furnace process's efficiency is highly dependent on the quality of the raw materials used, with higher-quality coke lowering production costs and yielding better molten iron.
Bituminous coal suitable for metallurgical purposes and smelting iron must be low in sulfur and phosphorus content. This type of coal is often referred to as coking coal or metallurgical coal. It is generally harder, blacker, and contains more carbon and less moisture and ash than low-rank coals. The best unblended coking coal is high-quality medium-volatile bituminous coal, although blends of different coals are commonly used to achieve the desired properties. Smithing coal, a type of bituminous coal of the highest quality with minimal ash and sulfur content, is used by blacksmiths to manufacture coke.
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Bituminous coal is the most abundant rank of coal
Bituminous coal, also known as black coal, is a middle-rank coal that falls between subbituminous coal and anthracite in quality. It is a type of coal that contains a tar-like substance called bitumen or asphalt. Bituminous coal is typically hard but friable, with a black or dark brown colour. It is composed of thin bands of alternating bright and dull material.
The ranking of coal depends on the types and amounts of carbon present, as well as the amount of energy the coal can produce when burned. Bituminous coal typically contains 45%–86% carbon, with a typical composition of about 84.4% carbon, 5.4% hydrogen, 6.7% oxygen, 1.7% nitrogen, and 1.8% sulfur. It is formed from sub-bituminous coal that is buried deeply enough to be heated to 85 °C (185 °F) or higher.
Bituminous coal is used to generate electricity and is an important fuel and raw material for making coking coal for the iron and steel industry. Bituminous coal suitable for smelting iron must have low sulfur and phosphorus content. It is also known for releasing the largest amounts of firedamp, a dangerous mixture of gases that can cause underground explosions. As a result, the extraction of bituminous coal requires strict safety procedures, including vigilant gas monitoring, good ventilation, and site management.
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It is formed from sub-bituminous coal under heat and pressure
Bituminous coal, also known as black coal, is a type of coal that contains a tar-like substance called bitumen or asphalt. It is typically hard but friable, with a black or dark brown colour. It is the most abundant rank of coal, with deposits found worldwide in rocks of Carboniferous age. Bituminous coal is primarily used for electrical power generation and in the steel industry.
Bituminous coal is formed from sub-bituminous coal under heat and pressure. Sub-bituminous coal is composed of partly decayed plant and mineral matter, which, when subjected to high pressure and heat, undergoes physical and chemical changes to become coal. This process is known as coalification. The ranking of coal depends on the types and amounts of carbon it contains and the amount of heat energy it can produce. Bituminous coal contains 45%–86% carbon, while sub-bituminous coal typically contains 35%–45% carbon. The higher rank of bituminous coal reflects the higher temperature it reaches during formation.
The temperature range for the maturation of bituminous coal is from 85 to 235 °C (185 to 455 °F). If the coal reaches temperatures above approximately 235 °C (455 °F), the bitumen breaks down, and the coal matures into anthracite, the highest rank of coal. The presence of bitumen in bituminous coal is due to the formation conditions being similar to those in which petroleum is formed in source rocks. This process is known as bituminization and is accompanied by peak methane generation, making these coals gassy and prone to explosions.
Vitrinite reflectance is a measure of how reflective a polished surface of an average particle of vitrinite in the coal is. It is determined by how much of the carbon has condensed to an aromatic form from the heat and pressure of deep burial. In the United States, bituminous coal is defined as agglomerating coal yielding at least 10,500 Btu/lb (24,400 kJ/kg) of energy on combustion, with a fixed carbon content of less than 86%.
Bituminous coal is a valuable resource due to its relatively high heat value, low moisture content, ease of transportation and storage, and abundance. It has a broad range of commercial uses, including steam generation in electric power plants and the production of metallurgical coke for smelting iron ore. However, burning bituminous coal, especially high-sulfur coal, can release sulfur and nitrogen oxides, contributing to air pollution.
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It is mined in several US states and used for energy outside the US too
Bituminous coal is mined in at least 16 US states, with five states accounting for about 78% of total US bituminous production in 2022. The top five bituminous-producing states are:
- Wyoming (37%)
- West Virginia (14%)
- Kentucky (11%)
- Illinois (9%)
- Pennsylvania (7%)
Bituminous coal is the most abundant rank of coal found in the United States, accounting for about 46% of total US coal production in 2022. It is primarily used for electrical power generation and in the steel industry.
Outside the US, bituminous coal is also used for energy production and is found in several countries. The belt of Carboniferous coal fields extends into central Europe, with bituminous coal fields in Poland and the Czech Republic. The Polish deposits are one of the most important natural resources in the country. Bituminous coal is also used for the production of activated carbon, which involves coking the coal to remove volatiles, followed by steam treatment to activate it.
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Frequently asked questions
Bituminous coal, or black coal, is a dense sedimentary rock that is primarily used as fuel in steam-electric power generation. It is also used to make coke, an essential raw material for making steel.
Bituminous coal is usually black, but can also be dark brown. It often has well-defined bands of bright and dull material. It appears shiny and smooth, but a closer look reveals thin, alternating, shiny and dull layers.
Bituminous coal is between 100 million and 300 million years old.
Bituminous coal is composed of carbon, hydrogen, oxygen, nitrogen, and sulfur. Its fixed carbon content is less than 86%.
Yes, bituminous coal is a fossil fuel. It is formed from the remains of ancient organisms over millions of years.
