What is caking and non caking coal?

Caking coal is a type of coal which when heated in anaerobic conditions leaves a solid residue whereas non-caking coal when heated in similar conditions leaves a powdery residue. Peat coal is the first stage of transformation and that is why it contains more impurities and less amount of carbon.

What is meant by caking coal?

Coal that softens and agglomerates on heating and after volatile matter has been driven off at high temperatures; produces a hard gray cellular mass of coke. All caking coals are not good coking coals.

What is the difference between non-coking coal and coking coal?

Noncoking coals have higher ash content and are typically used in thermal power plants as steam coals. Coking coal is the type of coal which on heating in the absence of air undergoes a transformation into a plastic state, swells, and then solidifies to form coke.

What is a non-coking coal?

A non-coking coal is that coal which when heated in the absence of air leaves a coherent residue. This residue does not possess the physical and chemical properties of the coke and is not suitable for the manufacture of coke.

How is caking coal made?

As a caking coal is heated it passes through a region where it becomes very plastic, softens, swells and then re solidifies. The residue is a cellular coke mass. Coals which do not cake are simply form a non coherent or weakly coherent char.

Which coal is used for making coke?

coking coal
Metallurgical coal, also known as coking coal, is used to produce coke, the primary source of carbon used in steelmaking. Metallurgical coal differs from thermal coal, which is used for energy and heating, by its carbon content and its coking ability.

What is the best grade of coal?

Anthracite
Anthracite is the best quality of coal which carries 80 to 95 per cent carbon content. It ignites slowly with a blue flame. It has the highest calorific value.

What is caking coal and coking coal?

The caking coal might give a coke which may not be accepted by the steel plants as it does not possess the requisite physical and chemical properties of the coke. A coking coal is that coal which on heating in absence of air leaves a solid residue.

Where is non coking coal used?

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 is anthracite coal used for?

Automatic stoker furnaces
Hand-fired stovesDomestic fuelCharcoal briquettesPower generation
Anthracite/Uses

The principal use of anthracite today is for a domestic fuel in either hand-fired stoves or automatic stoker furnaces. It delivers high energy per its weight and burns cleanly with little soot, making it ideal for this purpose. Its high value makes it prohibitively expensive for power plant use.

What is the name for the highest rank coal?

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.