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Rock Crushing Process

Rock Crushing Process

Rock Crushing Process Introduction

This document provides guidance specifically for rock crushing process permit applications. Use of this document helps streamline the Commission on Environmental Quality permitting process and decreases the time required for a permit review. This document may also be used for any nonmetallic mineral crushing/screening facility. It is important to remember that all application representations, such as production rates, crushing rates, number of screens, become conditions upon which a permit is issued or renewed.


Rock Crusher Equipment For Sale

Rock and crushed stone products are generally loosened at the quarry site by drilling and/or blasting. At the quarry, the materials are loaded by power shovel or front end loader and transported by heavy earth moving equipment to the location of the processing equipment. Further processing may include crushing, screening, other size classification, material handling and storage operations. All of these processes can be significant sources of dust emissions if uncontrolled. Emissions rates must be determined for each point, beginning with the initial loading of rock and fractured stone products into the processing area and every point through the storage and loading of the final product. Emission points at these facilities occur at all feed hoppers, crushers, vibrating screens, portable belt conveyor and drop points, conveyors, and material stockpiles. The quarry, mine, or blasting event is not a required emission point and not included in the calculations.


Rock Crusher Control Factors

The applicant must be cautious in the use of rock crusher control factors. Control factors are parameters used to give credit for certain emission reduction techniques. A control factor may be applied to each applicable emission point when calculating the emission rates. The emission factor table supplied with this document lists both uncontrolled and controlled emission factors. The use of the appropriate controlled emission factor from this table implies the material has a minimum of 1.5% moisture content. When the controlled factor is used then no further control is allowed for the addition of water from sprays (sprays will be required to be installed on certain emission points) or for the fact the material is wet. Any additional control must come from a different mechanism, such as enclosure, saturation, foam surfactant. When the applicant is using the controlled emission factor only, the proper numerical entry into the calculation table for the control factor parameter is one.

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