Lignite
Lignite is the youngest type of coal deposit. This coal is soft and ranges from black to shades of brown in colour.
Lignite is chiefly used for electricity generation and accounts for 17 % of the world’s coal reserves.
Coal processing or coal beneficiation uses physical (mechanical) and/or chemical methods to remove rocks, dirt, ash, sulphur and other contaminants and unwanted substances to produce high-quality coal for energy and metallurgical applications in both local and export markets.
Multotec manufactures a complete range of equipment for coal processing plants, from the Run of Mine (R.O.M) stockpile to the tailings dam, including:
When developing processing solutions for the coal mining industry, we consider ore characteristics, process requirements and environmental constraints to achieve the desired coal quality in terms of calorific value or ash content.
Multotec helps to customise and optimise your coal beneficiation process to identify the most economical processing route to achieve the required product specifications!
Get in touch with Multotec today to see how we can improve efficiency and lower the overall costs of your coal processing plant and get more from your ore.
MATO Conveyor Solutions from Multotec include belt cutters, clamps, lacing systems, belt cleaners and accessories.
Multotec supplies a range of mineral processing sampling solutions that provide precise, unbiased samplers for all minerals and commodities.
Our wear solutions provide industry-leading sliding- and impact-resistant linings for high velocity, abrasive material conveyance
Magnetic Separators that easily separate ferromagnetic and paramagnetic particles – and remove tramp metals – from dry solids or...
Multotec-designed spiral separators are used across the world in coal, gold, iron ore, mineral sands, platinum and chrome processing plants.
Classification, dense medium and tailings dam cyclones for minerals processing, food processing, waste water treatment and more.
Complete range of slurry pumps for medium / heavy-duty cyclone feed, spirals feed, mill discharge, tailings disposal, filter feed and more.
Industrial Centrifuges from Siebtechnik Tema are tailored for solid liquid separation in the mineral processing industry.
We supply polyurethane, rubber and wedge wire modular screen panels, trommels, sieve bends, statics, baskets and more!
Get in touch with your local mineral processing specialists.
Remove impurities from the coal for a more efficient and cleaner burning fuel with coal processing equipment from Multotec.
Involves feeding the ore through a size reduction machine which is typically a roll crusher or mineral sizer. Thereafter the material is placed on a sizing screen. Any tramp metal that is present at this stage is removed via an over-belt magnet.
Coarser coal is fed to a dense medium separator (DMS) drum or a large diameter dense medium cyclone.
If a dense media drum is used, the intermediate size fraction reports first to a desliming screen, followed by the dense medium cyclone, which is more suitable to process the smaller size fractions effectively.
The coal product (floats) flows onto the drain and rinse screen, used for media recovery and dewatering. This ensures maximum media recovery from the process, resulting in a clean coal product. The coal waste (sinks) also discharges onto a drain and rinse screen for media recovery purposes.
The product can be screened further into different-sized fractions.
The material reporting to the desliming screen is screened to remove any ultra-fine coal particles.
Ultra-fine coal particles are fed through a classification cyclone followed by spiral separators or other water-based separation equipment, flotation, screens and centrifuges or filter presses.
The use of dewatering screens is generally the first step in the coal dewatering process. Centrifuges then subject the material to high centrifugal forces through high-speed rotation, forcing further separation of the coal from moisture.
View how Multotec coal processing equipment is designed for all stages of coal processing in this industry flowsheet.
Coal beneficiation machinery from Multotec enables you to achieve your processing goals at the lowest cost per ton. We supply coal beneficiation equipment for the entire process, from R.O.M stockpile to dewatering.
Our coal processing solutions:
Multotec can customise your coal beneficiation process according to the calorific value, level of inherent mud and ash, as well as the desired coal quality.
The first segment of the coal beneficiation process involves feeding the ore through a roll crusher and then sizing screen.
Following sizing, the coarser coal is fed to a DMS drum or large diameter DMS cyclone via a conveyor fitted with an overbelt magnet, which eliminates any ferromagnetic contaminants such as old bolts, tool shards, and other metallic scrap. In coal beneficiation, drain and rinse screens are located downstream of the DMS drum or large diameter DMS cyclone.
Finer coal particles are fed from the sizing screen to a desliming screen to remove ultra-fine coal particles. Ultra-fines are fed through a classification cyclone, flotation, spiral separators, screens and centrifuges or filter presses. Less fine particles are fed through a DMS cyclone, screens and centrifuges.
Coal mining can involve extracting coal from surface or underground deposits. Coal surface mining is conducted when coal is less than 90 metres underground. Large machines remove the topsoil and layers of rock known as overburden to expose coal seams. Mountaintop removal is a form of surface mining where the tops of mountains are dynamited and removed to access coal seams.
Underground mining, or deep mining, is necessary when the coal is roughly over 90 metres below the earth’s surface. Some underground coal mines are hundreds of metres deep with tunnels that may extend out from the vertical mine shafts for kilometres.
Modern coal cleaning technologies include DMS cyclones and spiral concentrators.
With DMS, very accurate density separation can be achieved within a short time frame.
Currently, the most efficient coal beneficiation method is the “float-and-sink separation” which increases productivity and separation. By using cyclones with accurate cut-point control, different densities of coal can be separated. DMS makes use of magnetite as a separation medium to improve the accuracy of cut-point separation. The magnetite is later recovered from the coal through drain, rinse screens, and magnetic separation.
Coal fines (particles less than 0.5 mm in size) are beneficiated with spiral concentrators. The refined coal and discards are separated with adjustable blades located at different points in the slurry stream. This allows for separation of products to the required quality.
Lignite is the youngest type of coal deposit. This coal is soft and ranges from black to shades of brown in colour.
Lignite is chiefly used for electricity generation and accounts for 17 % of the world’s coal reserves.
Subbituminous coal is the result of millions of years of continued pressure and high temperatures on lignite.
Due to its low sulphur content, it burns cleaner than other types of coal, producing less greenhouse gas emissions.
It is used in electricity generation and industrial processes, making up 30% of the world’s coal reserves.
Bituminous coal is harder and blacker than lignite and subbituminous mineralisation and can be divided into two types: thermal and metallurgical.
Used in energy generation for heating and mixed with iron ore to produce steel, this coal makes up 52 % of the world’s coal reserves and accounts for most of the coal industry.
Anthracite is the most mature form of coal deposit and holds the highest carbon content of any coal type.
Also known as hard coal, mines that produce anthracite or hard coal account for roughly 1 % of the world’s total coal reserves.
This is a very small part of the overall coal industry, but is of the highest quality, with the highest calorific value.
We are specialists in coal beneficiation and supply our equipment globally. The effects of Multotec’s equipment in coal beneficiation achieves optimum results in processing. This is the result of 50 years of finding solutions to process more ore at a lower cost.
Our R&D programme responds to real-field challenges as well as cutting-edge coal beneficiation technologies so that we can constantly look for places where process efficiency can be increased.
Multotec’s R&D aims to enhance mineral and coal beneficiation through increasing product speed to market; high levels of product consistency and reliability; for OEMs to assume the role of solution providers; and the recycling of customers’ products at the end of their working life.