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How does an Asphalt Batching Plant work?
Asphalt Plant Management ConsoleAggregates are collected from the stock piles on site and loaded into the cold feeders with a mechanical shovel. Each cold feeder contains a specific aggregate size and is fitted with its own extractor belt. Nowadays, plants have a minimum of four cold feeders but can be fitted with many more, depending on the flexibility of work and the requirements of the grading curve.
Via a transporter belt, the aggregates are fed into the dryer drum for moisture extraction and heating to the correct temperature, ready for mixing and coating with bitumen.

The role of the dryer-drum in a batch asphalt plant
Dryer Drum of an Asphalt  PlantThe dryer drum is nothing other than a rotating cylinder, with a series of flights on the inside which have the function of lifting the virgin material and heating it through contact with the hot air produced by a burner.
The heat of the flame inside the dryer is conveyed to the aggregates via thermal radiation. It is natural that a considerable amount of gas, dust and elements of combustion are produced inside the dryer, and these are then passed through a bag filter before being released into the atmosphere.

The bag filter
Asphalt Plant Bag FilterDue to increasingly restrictive limits for atmospheric emissions together with new technologies for greater filter efficiency, problems related to environmental impact have now been greatly simplified.

 Materials collected in the filter, commonly known as filler (even though this is an improper use of the term, since the material isn’t always screened through the 0.063 mm screen), is collected at the bottom by an auger, then conveyed into a surge hopper, ready to be weighed and re-fed into the mixer in the correct quantity.

The filler plays a fundamental role in regulating the asphalt adhesion and improving the bitumen binding to the aggregates.

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