Coal Preparation Plant | Coal Preparation Process | Coal Washing

What is Coal Preparation Plant

Coal preparation plant

Coal preparation plant is a coal processing plant that include a series of processes: raw coal screening, crushing, coal washing, separation, clean coal dewatering and slime recycling. Which can separate coal from impurities, remove mineral impurities from raw coal and divide it into different specifications of products.

The main products of the coal preparation plant are clean coal and lump coal, as well as by-products such as medium coal and slime. Usually coal preparation plants are divided into:

  • Coking Coal Preparation Plant: It produces low ash clean coal for coking.
  • Steam Coal Preparation Plant: It produces fuel coal for thermal power generation, steam locomotives, boilers and raw coal for chemical industry.

Why is Coal Preparation Need

Raw coal is mixed with various mineral impurities in the process of formation, and inevitably mixed with rocks and other impurities in the roof and floor in the process of mining and transportation. So the raw coal must be prepared, the main purpose of coal preparation can be summarized as follows:

  • (1) Remove impurities in run-of-mine coal, reduce ash and sulfur, improve coal quality and meet the needs of users;
  • (2) Divide coal into different quality and specifications to meet the needs of users, so as to make effective and rational use of coal and save cost;
  • (3) After coal washing, gangue can be discarded on the spot, which can reduce invalid transportation and create conditions for comprehensive utilization of gangue;
  • (4) Coal washing can remove most of the ash and 50% – 70% pyrite sulfur, and reduce the air pollution caused by coal combustion. It is the premise of clean coal technology.

Coal Preparation Process

coal preparation

Crushing & Screening: Raw coal is transported to crushing workshop by belt conveyor. First, it is pre screened by a circular vibrating screen with a sieve opening of 50 mm. +50mm materials and extra large gangue enter the crusher and are crushed to – 50mm, and then transported to the coal washing workshop together with -50mm raw coal that under the vibrating screen.

Jig Density Separation: Raw coal in the coal washing workshop is distributed to two raw coal buffers by scraper transporters, and two chain coal feeders are fed into two jigs respectively. Raw coal is divided into clean coal, medium coal and gangue in the jigs.

After the medium coal and gangue are dewatered by the bucket elevator, they enter the medium coal and gangue bunker respectively, and then transported by the automobile as the final products. The clean coal is graded and dewated by a linear vibrating screen with sieve hole of 13mm, and the coal under the screen enters the pit for grading.

Clean Coal Dewatering: The 13-0.5mm clean coal in pit is first dewated by bucket elevator, secondly dewated by centrifuge machine, and then transported to the clean coal storage yard by belt conveyor as the final product together with the clean coal on the screen.

Flotation: The overflow from the pit enters the flotation feed pool and is pumped to the pulp preprocessor through the slurry pump. The foaming agent and collector are added to the pulp preprocessor, and the coal slime water after adding auxiliaries flows into the flotation machine.

-0.5mm slime is separated into clean coal and tailings in the flotation machine. The flotation clean coal flows into the flotation concentrate pool and is pumped to the clean coal filter press for dewatering. The dehydrated flotation clean coal is mixed with jigging clean coal as the final product.

Tailings Concentration: Floation tailings flows into the tailings pool of the concentrator workshop and then pumped to the paste thickener, usually 2 paste thickeners are required to stand by each other to ensure that when an accident occurs in the thickener, the slime water will not be drained out.

Slime Management: The bottom flow of the concentrator(thickener machine) is dehydrated by the filter press, and the filtered slime is transported to outside of the coal preparation plant. The overflow of the concentrator and the filtrate of the filter press flow into the circulating pool in the concentration workshop, which is pumped to the jig for recycling use.

CRF Circulating Water: The water of the whole coal preparation plant needs to be recycled, because the water cost much in a wet coal preparation plant, Usually the repeated utilization rate of water needs to be more than 90%, and the unit supplementary water quantity is less than 0.15m ³/ t (raw coal).

[Coal Washing]: As coal preparation plant is divided into dry preparation and wet preparation, the processes of coal preparation with jig and heavy medium cyclones generally need to use water as the separaton medium, so it is also known as a coal washing plant. While the coal processing with air separation, screen separation or manual separation, etc. that without use of water is called a coal preparation plant or dry coal beneficiation.

In general, all coal washing plants belong to coal preparation plants.

coal plant

Coal Preparation Process [How To Clean Coal] PDF Download


  1. Bintang Lima says:

    hi we are Interesting for coal processing plant, from crushing to wash for improving the coal quality.
    we are palnning firstly small scale first : 30 tph/700 tpd/ 0.25 MTPA capacity.
    we would like to get your proposed design and price
    Location : West Sumatera
    Warm Regards


    Dear All,

    We are currently bidding for a project to build CHPP coking coal washing plant in 3 parts with a total production with a capacity of 30mpta and will like to partner with your Organization in the design, construction and commissioning of the project

    Please let me know the possibilibilities of this and I will be happy to commence discussion immediately

    Sincere regards


    1. beidoou says:

      Thank you very much for your inquiry. We will communicate with you as soon as possible regarding the technical aspects of the coal preparation plant

  3. Hunain Jawad says:

    Dear Sir/Madam,
    Hope you’re doing well.

    Mughal Iron & Steel Industries Limited is the leading steel manufacturing company in Pakistan. We are a public limited company listed on Pakistan Stock Exchange. We are among the largest consumers and processors of Ferrous and Non-Ferrous Scrap in Pakistan.

    Now we are aiming to expand our business towards coal mining and extraction of energy resources. Keeping in view the expertise Beidoou holds in this field; we are contacting you to explore this project and set up a coal washing/coal beneficiation plant in Pakistan.

    Looking forward to hearing from you so that we can take our discussions on this project and forward and hopefully buy this technology from your company.

    Best Regards,

    Hunain Jawad

  4. khan says:

    Hi, I hope this email finds you well
    I am interested in a Coal washing plant to remove sulfur. Based on my little knowledge I am having difficulty selecting an appropriate machine.
    If you can please recommend the required Coal test before buying and after the test machinery.
    Looking forward to hearing from you

  5. Parav Part Rayan Vorna says:

    Dear Sir/ Madam;

    Weare a consulting engineering company in the construction of industrial factories in Iran. We are going to build a coal Washing plant with capacity of 1.000.000 tons per year. This project is going to be in 3 phases with 2 capacities.

    We intend to find a technology provider or a company who can provide us EPC + Warranty services for this project.

    I will appreciate it if you send us information as follows:
    1. Technical proposal with price for this project
    2. Financial proposal
    If you need any more detail about this project, please let us know.
    I look forward to hearing from you.

    1. beidoou says:

      yes sir, we will send you the coal washing plant production line

  6. Mukkaram Ali says:

    Dear Sir,

    We request you to please quote your best possible discounted prices as per below mentioned inquiry.
    2 Nos of Coal Washing Plants with a capacity ranging 100 T/H & 200 T/H.
    We request you to please send us your Exclusive Offer including below:-
    Ex-works, Price
    Country of Origin
    Make/Manufacturer name
    Delivery period
    Validity period
    Data sheet of offered items
    Weight of offered items
    HS Code and Packing Dimension
    Warranty/ Guarantee.
    Looking forward for your earliest feedback.

    Thanks and Best Regards,
    Mukkaram Ali

  7. Amit Kumar says:

    Dear Sir,

    We are looking for Coal beneficiation equipment to reduce the sulfur content to less than 1% and increase the Calorific value from the coal ore.
    Kindly quote us the equipment that can improve the quality.
    We are looking at a finished product of 1000 MT per day.

  8. JamesNeige says:

    I am sorry, that I interfere, there is an offer to go on other way.

  9. Mohamadreza says:

    Hello. Our company needs advice, guidance and machinery to produce high quality anthracite coal and low ash. Please cooperate. My country is Iran
    Thank you dear brother

    1. beidoou says:

      ok,my team will contact you very soon.

  10. Petros E Muchenje says:

    We require a quotation , including product brochure and product quality certification and reference letters x 3 from past customers in the last 10 years.

    The Product – Coal Screening Machines

    Specs- With master meter, output capacity 1 000 ton/hr, feed size 150mm x 150mm or more, max feed height 3600mm, min hoper capacity 8m3, triple deck vibration screen of min size 1520mm x 6100mm, Diesel powered and Coal size output 40mm

    Qty 02

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