logo comp4

Vipeak Crusher Plant Technical Data

The crushing and screening general permit is a permit for a facility class (crushing and screening plants) that contains 10 or more facilities that are similar in nature, have substantially similar emissions, and would be subject to the same or substantially similar requirements.The general permit will last for 5 years from the date of its issuance.Equipment that is covered under the general permit will be required to have an ?┬░authorization to operate?┬▒ (ato).The ato will identify the piece of equipment by having the manufacture, date of manufacture, maximum capacity, and serial number and /or equipment number along with the hours of operation limitation depending on the equipment and the county it is operating in.This general permit allows for portable crushing and screening plants to move to other locations statewide.This general permit also allows the permittee to colocate a concrete batch plant with the crushing and screening plant.The permittee that applies for an ato under the general permit shall pay to the department a flat permit processing fee of $500 with the submittal of the permit application.The permittee must also pay, for each calendar year, the applicable administrative or inspection fees as described in the arizona administrative code title 18, chapter 2, article 5, section 511 (a.A.C.R18-2-511).Crushing and screening plant process description rock and crushed stone products generally are loosened by drilling and blasting and then are loaded by power shovel or front-end loader into large haul trucks that transport the material to the processing operations.Techniques used for extraction vary with the nature and location of the deposit.Processing operations may include crushing, screening, size classification, material handling and storage operations.All of these processes can be significant sources of pm and pm10 emissions if uncontrolled.Quarried stone normally is delivered to the processing plant by truck and is dumped into a bin.A feeder or screens separate large boulders from finer rocks that do not require primary crushing, thus reducing the load to the primary crusher.Jaw, impactor, or gyratory crushers are usually used for initial reduction.The crusher product, normally 7.5 to 30 centimeters (3 to 12 inches) in diameter, and the grizzly throughs (undersize material) are discharged onto a belt conveyor and usually are conveyed to a surge pile for temporary storage or are sold as coarse aggregates.The stone from the surge pile is conveyed to a vibrating inclined screen called the scalping screen.This unit separates oversized rock from the smaller stone.The undersized material from the scalping screen is considered to be a product stream and is transported to a storage pile and sold as base material.The stone that is too large to pass through the top deck of the scalping screen is processed in the secondary crusher.Cone crushers are commonly used for secondary crushing (although impact crushers are sometimes used), which typically reduces material to about 2.5 to 10 centimeters (1 to 4 inches).The material (throughs) from the second level of the screen bypasses the secondary crusher because it is sufficiently small for the last crushing step.The output from the secondary crusher and the throughs from the secondary screen are transported by conveyor to the tertiary circuit, which includes a sizing screen and a tertiary crusher.Tertiary crushing is usually performed using cone crushers or other types of impactor crushers.Oversize material from the top deck of the sizing screen is fed to the tertiary crusher.The tertiary crusher output, which is typically about 0.50 to 2.5 centimeters (3/16th to 1 inch), is returned to the sizing screen.Various product streams with different size gradations are separated in the screening operation.The products are conveyed or trucked directly to finished product bins, to open area stock piles, or to other processing systems such as washing, air separators, and screens and classifiers (for the production of manufactured sand).Some stone crushing plants produce manufactured sand.This is a small-sized rock product with a maximum size of 0.50 centimeters (3/16th inch).Crushed stone from the tertiary sizing screen is sized in a vibrating inclined screen (fines screen) with relatively small mesh sizes.Oversized material is processed in a cone crusher or a hammermill (fines crusher) adjusted to produce small diameter material.The output is returned to the fines screen for resizing.In certain cases, stone washing is required to meet particulate end product specifications or demands.Concrete batch plants at most of these plants, sand, aggregate, cement and water are all gravity fed from the weigh hopper into the mixer trucks.The concrete is mixed on the way to the site where the concrete is to be poured.At some of these plants, the concrete may also be manufactured in a central mix drum and transferred to a transport truck.Most of the remaining concrete manufactured are products cast in a factory setting.Precast products range from concrete bricks and paving stones to bridge girders, structural components, and panels for cladding.Concrete masonry, another type of manufactured concrete, may be best known for its conventional 8 x 8 x 16-inch block.In a few cases, concrete is dry batched or prepared at a building construction site.The raw materials can be delivered to a plant by rail, truck or barge.The cement is transferred to elevated storage silos pneumatically or by bucket elevator.The sand and coarse aggregate are transferred to elevated bins by front end loader, clam shell crane, belt conveyor, or bucket elevator.From these elevated bins, the constituents are fed by gravity or screw conveyor to weigh hoppers, which combine the proper amounts of each material.

Chat Online