Metallurgical coal or coking coal 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. … Metallurgical coal is low in ash, moisture, sulfur and phosphorus content, and its rank is usually bituminous.
What do you mean by coking coal?
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. … Coke is produced by heating coking coals in a coke oven in a reducing atmosphere.
What is the difference between coking coal and non coking coal?
A non-caking coal is that coal which on heating in absence of air doesn’t from a coherent mass of residue. … A coking coal is that coal which on heating in absence of air leaves a solid residue. A non-coking coal also leaves a solid coherent residue which may not possess the physical & chemical properties of the coke.
What is caking and coking coal?
In coal utilization: Thermoplastic properties. … exhibit such behaviour are called caking coals. Strongly caking coals, which yield a solid product (coke) with properties suitable for use in a blast furnace, are called coking coals. All coking coals are caking, but not all caking coals are suitable for coke making.
What is the difference between Met coal and thermal coal?
Better quality met coal tends to have more of the reactive fusible components, resulting in stronger coke, while PCI coal tends to have low levels of fusible material. Met coal typically contains more carbon, less ash and less moisture than thermal coal, which is used for electricity generation.
What are 4 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.
What is coke from coal used for?
Coke is a grey, hard, and porous fuel with a high carbon content and few impurities, made by heating coal or oil in the absence of air—a destructive distillation process. It is an important industrial product, used mainly in iron ore smelting, but also as a fuel in stoves and forges when air pollution is a concern.
What is the best grade of coal?
The four ranks are: Anthracite: The highest rank of coal. It is a hard, brittle, and black lustrous coal, often referred to as hard coal, containing a high percentage of fixed carbon and a low percentage of volatile matter. Bituminous: Bituminous coal is a middle rank coal between subbituminous and anthracite.
What is Coke vs coal?
By distilling bituminous coal in retorts to obtain gas for illumination, or by burning it in kilns or pits, the residue left behind is called coke, which is simply coal charcoal, and is nearly pure carbon.
Can steel be made without coking coal?
Coking coal is usually bituminous-rank coal with special qualities that are needed in the blast furnace. While an increasing amount of steel is being recycled, there is currently no technology to make steel at scale without using coal.
Which coal is used for making coke?
Almost all metallurgical coal is used in coke ovens. The coking process consists of heating coking coal to around 1000-1100ºC in the absence of oxygen to drive off the volatile compounds (pyrolysis). This process results in a hard porous material – coke.
Which coal has no caking power?
Non Coking Coal does not have any caking properties and it is mainly used as thermal coal for power generation. It has a higher ash content and also used in industries like cement, fertilizer, glass, ceramic, paper, chemical and brick manufacturing.
What happens when coal melts?
Without oxygen, the coal does not burn. Instead, it begins to melt. The high temperatures volatilize unwanted impurities, such as hydrogen, oxygen, nitrogen, and sulfur. These off-gasses can either be collected and recovered as by-products or burned off as a source of heat.
Is there an alternative to coking coal?
This one is obvious – renewables! 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 type of coal is used for steel?
What type of coal is steam coal?
Steam coal (sometimes called thermal coal) is a grade of coal used in electric power plants to generate steam to create electricity. Most of the coals mined in the United States are steam coals.