RDF plant

Mixed waste

In a RDF plant, the steps are usually pre-shredding, screening/separation and post-shredding. The process is designed to customer requirements. The composition of the input material and the sales opportunities of the final products are key factors. 

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Pre-shredding brings the input material to a uniform size, which in some cases is already the right size for fuel, and eliminates overlengths, which would interfere with further processes.

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Separation removes contraries and recyclable materials from the fuel fraction.

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Fine shredding brings the fuel fraction, now free of contraries, to the right particle size. Optional post-screening makes sure that the particles do not exceed the maximum size for fuel use. 

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Pre-shredding
with low speed

The process starts with a Terminator single-shaft shredder, whose shredding performance is configured for the input material. The contrary resistance of the shredder lets it accept a wide range of input materials, while the even intake ensures a consistent supply of shredded material to the downstream process steps. 

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Removal
of fines

If there is substantial organic content in the input material, it will need to be removed before further processing. The machine used for this is either a stationary Komptech drum screen or Flowerdisc disc screen. 

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Preparation of
RDF fraction

The Ballistor’s separation function enables splitting of the material stream into three fractions – flat (2D), cubic (3D) and fine. The 2D fraction consists largely of high-caloric, contrary-free materials that is further processed into fuel. The 3D fraction contains readily separable recyclables (metals etc.) that can be reclaimed for recycling. 

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Defined post
shredding

The 2D fraction is post-shredded to the grain size specified by the customer. Since the contraries have already been removed at this point, this step is done directly with the 2D fraction. 

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Specific fuel
qualities

Additional processing steps can be applied to achieve the desired quality in terms of chloride, metal or ash content for various applications (cement works: rotary kiln or calcinator, fluidized bed furnace). The granular size of the fuel will depend on the customer requirements. The plant design can also be adjusted to influence the caloric value of the RDF. 

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