On what factors does the specific gravity of coal depends?

The chief factors which affect the specific gravity of coal, aside from difference in type, are (a) the amount of impurities, and (b) the amount of moisture present in the coal. A high-ash coal has a greater Page 10 ILLINOIS ENGINEERING EXPERIMENT STATION specific gravity than a low-ash coal of the same type.

What is the specific gravity of coal?


On which property of coal does the design of bunkers for the storage of coal depends?

On which property of coal does the design of bunkers for the storage of coal depends? Explanation: Bunkers/coal bins are the containers in which the coal can be transported. Bulk density is weight of soil present in coal. According to the bulk density the design of containers are generated.

What is the density of coal?

Density. Knowledge of the physical properties of coal is important in coal preparation and utilization. For example, coal density ranges from approximately 1.1 to about 1.5 megagrams per cubic metre, or grams per cubic centimetre (1 megagram per cubic metre equals 1 gram per cubic centimetre).

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How is the quality of coal determined?

The most common classification is based on rank, referring to the degree of coalification that has occurred. The rank of a coal is determined primarily by the depth of burial and temperature to which the coal was subjected over time. With increasing temperature, peat is converted to lignite, a very soft, low-rank coal.

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 the weight of coal?

Coal normally weighs 80 – 85 pounds per cubic foot or converted and rounded off, 145 tons per acre inch. One acre then would be 30 times 145 or 4,350 tons.

Which of the following constituents of coal is the most important in the production of coke?

The most important properties of coke are ash and sulphur content, which are dependent on the coal used for production. Coke with less ash and sulphur content is highly prized on the market.

Is high volatile matter in coal Good?

High-volatile matter may also be associated with spontaneous combustion, especially in low-rank coals (Fierro and others, 1999). Hence, knowledge of volatile matter is important for safety, handling, and transporting coal.

What is low vol coal?

This corresponds to a fixed carbon content of 69 to 78%. Low volatile bituminous coals have 14 to 22% volatile matter on a dry mineral matter free basis. This corresponds to a fixed carbon content of 78 to 86% (ASTM, 2014). Bituminous rank and defining characteristics.

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Which type of coal has the highest density?


Which coal has highest ash content?


What are the properties of soft coal?

Bituminous coal or black coal is a relatively soft coal containing a tarlike substance called bitumen or asphalt. It is of higher quality than lignite and Sub-bituminous coal, but of poorer quality than anthracite. Formation is usually the result of high pressure being exerted on lignite.

Which is the best quality of 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.

Which country has the best quality coal?

Experts told Fact Check that Australia’s coal is on average high quality as a result of its low moisture and ash content, and high carbon content, compared with other countries, particularly Indonesia, the largest coal exporter in the world.

What is ranking of coal?

Coal rank is the measure of the degree of organic metamorphism (coalification) of a coal, ranging from low-rank peat to high-rank meta-anthracite.

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