10-17-2006 (2) - Laserfiche WebLink

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.wlJ..iLli.... . . . 4. Production Facilities. A. Aggregate: The current plan for processing aggregate utilizes a loader to move the aggregate material to a feeder, which via a series of conveyors feeds the material to a screening and crushing plant. The material is crushed and sized into various products, which are then stockpiled on site, The equipment typically used for this type of material processing includes multiple crushing and screening plants, and conveyors, The crushing and screening plants utilized by Midwest Asphalt Corporation are portable in nature, They can be moved within the area as well as in and out of the operation as needed to replenish the product stockpiles, Once the products are stockpiled, front-end loaders are used to place the material into over-the-road trucks, which haul the materials to either Midwest Asphalt Corporation's job sites, or use for our external customers, We will utilize paved roadways and use a water truck on haul roads within the facility to control dust. B. Hot Mix Asphalt (HMA): A "drum mix" plant performs the making of HMA. A loader loads different materials into cold feed bins, which are measured into specified portions according to the kind of pavement required and carried by a conveyor belt into the drum where the material is dried and heated by a burner. If pavement removed from existing paved surfaces is to be recycled into new pavement, it is conveyed to the middle of the drum, Asphalt cement is pumped from its holding tank in liquid form (heated to about 300 degrees Fahrenheit) and injected into the drum where it mixes with and coats the aggregates. The drum operates very much like a clothes dryer. As it rotates, "flights" along its side keep the aggregates tumbling and dropping which ensures that they are thoroughly dried, heated, and mixed with performance grade binders before being dropped into the discharge chute and carried by a conveyor to the top of the storage silos, An exhaust fan at the end of the baghouse creates an airflow velocity in the drum, which pulls uncoated dust through a knockout box, This is a large volume structure that allows the exhaust air to spread out, reducing its velocity so that large portions of the heavy dust particles drop to the bottom to be returned to the mixture in the drum, A small amount of lighter particles are carried into the main body of the baghouse which functions like a series of vacuum cleaner bags, except the dust collects on the outside rather than the inside of the bags, The reason for this is that only clean, odorless air will be exhausted out of the stack, Every so often a pulse of air is injected into the bags to 7