Coal is an essential worldwide resource since it releases energy and electricity when burned. The progress of human society has been accelerated by the usage of coal. Coal is still important today, which suggests that there is still a big market for it.
For mine managers, the first step to enhancing profitability is gaining a deep understanding of coal. If you plan to mine or procure coal, the following six insights may prove helpful.
I.How does Coal Form?
In essence, coal is old plants that have been petrified. Selecting the right mining equipment requires an understanding of its origins in order to evaluate reserves and distribution. There are two main phases in the creation of coal:
1.Peatification stage: Dense marshes blanketed the Earth millions of years ago.Vast quantities of plants died in swamps. Through microbial decomposition and chemical reactions, this vegetation gradually transformed into thick peat or humus deposits at the original sites.
2.Coalification Stage: As the crust subsided, increasing sediment layers covered the peat deposits. The peat dehydrated and carbonized at extended high temperatures and pressures, first changing into lignite and bituminous coal and anthracite.
The solar energy absorbed by plants millions of years ago is the source of energy in coal. Coal is a non-renewable resource since its creation took tens of millions of years. In order to avoid resource waste, meticulous planning is needed for both its extraction and use.
II. What Are the Components of Coal?
Coal is a black, combustible organic rock that is primarily composed of carbon. It is the most widely distributed and abundant fossil fuel on Earth.
Composition
Primary component: Carbon.
Other Components: Hydrogen, oxygen, nitrogen, sulfur, and various minerals.
The higher the carbon content in coal, the better its quality. Hydrogen supplements the heat released during combustion. Sulfur combustion produces sulfur dioxide, which pollutes the environment. Other minerals in coal turn into waste slag after burning. You need to configure appropriate processing equipment to remove harmful components and enhance product quality.
Type
The classification of coal is determined by its degree of carbonization. Here are the four classifications.
1.Lignite: It has the lowest degree of carbonization, with a carbon content of 50%-70%. Its color is brown. Lignite is mostly mined thru open-pit methods, requiring relatively low production costs. This type of coal is relatively inexpensive and is mainly used for thermal power generation and boiler combustion.
2.Bituminous coal: Its degree of carbonization is moderate, with a carbon content of 70%-85%. Its color is black. Bituminous coal is the main type of coal and the main source of thermal coaland metallurgical coal. This type of coal has a wide range of uses, such as in power generation, chemical industry, and civilian applications.
3.Anthracite: It has the largest calorific value and the highest degree of carbonization, with a carbon concentration between 85% and 95%. It has a rough texture and a grayish-black tint. This coal is mostly utilized as a chemical feedstock and in precise manufacturing, and it is quite pricey.
4.Sub-bituminous coal: It has a carbon concentration between 75% and 85% and has characteristics with anthracite and bituminous coal.
III. Main Coal-Producing Sites
There are more than 1.06 trillion tons of known coal reserves worldwide. China produces more than half of the world’s coal annually, making it the top producer in the world. It is followed by the United States, India, Australia, and Russia. The production and export volumes of these nations collectively shape the global coal market.
China, the world’s leading coal producer, churned out 4.85 billion tons of raw coal in 2025, a 1.4% increase from the year before. Beyond its use in industrial boilers and power plants, China’s coal is also transformed through coal chemical technology into strategic resources like high-end synthetic fibers and aviation fuel.
The United States’ major coal reserves are found in the Appalachian, Illinois, and Powder River basins. Coal remains a vital source of energy for domestic power generation, accounting for 91.4% of total consumption. In addition, the United States is a major exporter of metallurgical coal.
Russia’s coal deposits are mainly concentrated in Siberia and the Far East.Open-pit mining provides access to about 63% of its coal resources, which include anthracite, bituminous coal, and lignite. Russia’s focus on coal exports is moving toward the Asia-Pacific market as a result of the global environment.
Australia’s coal reserves are concentrated in its eastern states: Victoria, New South Wales, and Queensland. The nation is the globe’s leading exporter, a position bolstered by its metallurgical coal, which accounts for 70% of its output. This has a significant impact on the global steel industry.
India’s energy infrastructure relies heavily on its coal reserves.However, its coal exhibits low carbon content and relatively low calorific value. Consequently, India typically imports high-quality coal from regions like Australia and Indonesia for blending purposes.
The origin of coal influences your mining costs, transportation expenses, and market supply. When mining or procuring coal, you must consider your specific requirements to select suitable origins and compatible mining machinery.
IV.The Uses of Coal for Humanity
Coal is no longer just an energy source for electricity generation and heating for humans; modern coal chemical technology has given it a “new identity.”
Traditional uses: thermal power generation, combustion boilers, residential heating.
High-end applications: With the development of modern coal chemical technology, the application of processes such as direct coal liquefaction, indirect coal liquefaction, and coal-to-olefins has further expanded the industrial uses of coal.①After being processed, coal can be used to make coke, coal tar, coal gas, and other things. Coke is the main raw material for making steel, and coal tar can be used to make chemicals like plastics and rubber.② Coal can also get arene, which are used to make para-aramid fibers for ropes or parachute frames. ③ Coal can be used to produce activated carbon, which is utilized in environmental protection, water purification, and food processing. In addition, coal by-products can be used to extract rare metals and produce fertilizers, maximizing resource utilization.
Understanding the uses of coal can help you clarify the direction of mining, assess market demand, and make informed choices about mining and processing equipment.
V. Coal Prices
Coal prices are not fixed and unchanging. Global energy competition, changes in environmental policies, and the emergence of new markets can all affect its price.These things not only affect the prices of coal, but they also affect how much money your mineral processing plant can make. Here are the prices for different kinds of coal:
As the main source of thermal coal, ordinary coal’s price is pretty stable, around $97.75 per ton.
Anthracite is the most carbonized type of coal, and its price can go as high as 35 per ton.Its core advantages are cleaner combustion and higher calorific value. It was once used as a fuel for home heating, but due to resource depletion, it is now very scarce.
Metallurgical coal: As a core raw material for steel production, it has high purity requirements and strict sulfur content control, resulting in significant price fluctuations.The price is directly affected by how much steel is made around the world, how much infrastructure is needed, and how much major exporting countries have to sell.
VI.How to Process Coal
The quality of the coal that is mined varies, and selling it directly doesn’t make a lot of money. The appropriate processing methods can enhance the added value and market competitiveness of your coal. The focus of coal processing is to improve quality, reduce sulfur content, and remove ash.
1.Screening and Crushing: This is the first thing that needs to be done to coal. First, use a vibrating screen to sort the raw coal by size, getting rid of big pieces of gangue and trash. Then, use a hammer crusher, jaw crusher, or impact crusher to break up the big pieces of coal into smaller ones. Lastly, use a Double Roller Crusher to make particles that are 2 to 10 mm in size.
2.Coal Grinding: Coal in fine powder form can better adapt to subsequent deep processing. Send the coal particles into the coal mill or Raymond mill to grind them into powder. The finer the coal powder, the higher the combustion heat.
3.Coal Powder Drying: Coal and coal powder typically include some moisture after being pulverized. Excessive moisture can increase shipping costs and reduce combustion efficiency.To make the coal powder simpler for further briquetting processing, excess moisture can be removed using a filter press or a dewatering screen.
4.Pressed Dry Coal Powder:Add an appropriate amount of binder to the dehydrated dry coal powder and press it into shape using a briquetting machine (such as coal balls). These briquettes are not only convenient for transportation and storage but also reduce the scattering and pollution of coal dust. The price of coal after briquetting has significantly increased. Its particle size is uniform, it burns steadily, it is environmentally friendly with low dust, and it has higher market acceptance.
Summary
Today’s coal is not just about mining and selling; it is gradually transforming into high-value products. You need to understand coal-related knowledge, choose the appropriate mining and processing equipment, and seize every opportunity to increase the efficiency of the mineral processing plant. Contact us to get more information about coal processing equipment.
FAQs
Q: Is the screened coal gangue useful?
A: Coal gangue is a carbon-containing rock discharged during the processes of coal mining and washing. Previously considered waste, it can now be used to make bricks, pave roads, and serve as low-calorific value fuel for power generation. Using it can both reduce waste pollution and generate additional income.
Q: What environmental pollution should be considered in coal mining and processing?
A: You need to pay attention to four types of pollution. The first is dust pollution, which requires dust removal equipment. Secondly, for exhaust gas pollution (sulfur dioxide), desulfurization and denitrification equipment is required for treatment. Third, there is wastewater and waste residue pollution, which requires supporting wastewater treatment and waste residue storage facilities to prevent soil and water source contamination. Fourth, there is noise pollution during processing.
Q: What should I do if the calorific value of the coal is too low?
A: You can improve it in two ways. First, mix your coal with high-quality coal to increase its calorific value. Second, further process the coal by screening and washing to remove ash and moisture, or by grinding and briquetting to improve combustion efficiency.
