Asphalt plant is a device that is used to combine the appropriate ratio of aggregates (sand) with bitumen and filler (airy sand) to produce asphalt. In the asphalt factory, the sand is usually transferred to the asphalt tower after it is baked, and separation, weighing, combination and mixing operations are performed on it.
Asphalt plant types in terms of asphalt type
Asphalt is divided into hot and cold asphalt according to the way it is made and used. Hot asphalt is produced from the combination of heated sand and bitumen at a high temperature in a hot asphalt factory, and cold asphalt is produced from mixing sand and bitumen at ambient temperature without the need for heating in a cold asphalt factory.
Cold asphalt plant
Cold asphalt plant does not have burners, dryers, filtration devices and sanders, and they are simpler than the hot type and are mostly mobile.
Hot asphalt plant
In the hot asphalt plant, hot or baked sand is combined with other materials in the heat.
< /p>
Types of asphalt factories products
Warm asphalt
Top layer (topeka)
Lining layer (binder)
Bituminous base
Asphalt sand
Cold asphalt (factory cold asphalt)
Types of asphalt plants in terms of production methods
Batch asphalt plant
in the factory batch asphalt or batching which is vertical, all materials (sand, bitumen and filler) are screened according to their size and then weighed according to standard scales and in batches with time intervals and intermittent stops They are mixed. Asphalt from these types of factories are of high quality.
The main components of the asphalt factory
Storage silos (feeders)
In asphalt plants, both hot and cold, there are a number of storage silos with different functions. One of the silos that exist in both types of asphalt factories is the silo for storing cold materials (feeder), which usually has 4 bins or storage tanks and is used to store and store sand, filler and bitumen, and then It gradually guides a certain amount of material to the next steps through the conveyor.
The hot material storage silo is another silo located in the asphalt tower of the hot asphalt factories. This silo is responsible for storing the heated materials and transferring them to the mixer.
The asphalt storage silo is another silo that is used to store the produced asphalt until the appropriate time to empty it. It is not necessary to have this silo in the asphalt factory, and in some factories, the materials before mixing are stored in the same silo as the storage of hot materials, so that they are first mixed and then taken out of the mixer at the right time.
< b> Material transfer systems
Conveyor belt and elevator are among the devices that are used to transfer materials horizontally or vertically in the asphalt factory. The conveyor transports the cold materials from the feeder to the drier or drier horizontally and the elevator takes the heated materials and the filler vertically from the drier to the asphalt tower.
Asphalt tower
Asphalt tower includes sander (for granulation), silo for storing hot materials and asphalt, weighing (for weighing materials before mixing) and mixer (for mixing sand with filler and bitumen). The asphalt tower exists only in hot asphalt factories with batch or batch production.
Filtration system
The filtration system includes exhaust fan, Cyclone and Bag Filter are responsible for purifying the polluted air resulting from asphalt production. Control System The control system includes the control room and It is a command board. The control room is the center where the operator controls all operations of the asphalt plant through precise control equipment and instruments and the control panel.