Rail and Truck Dumps

Frac Sand Mining or Silica Sand Mining

The potential air pollutants of most concern from frac sand mining are airborne particles, including particles less than 10 microns in size (PM10), particles less than 2.5 microns in size (typically called "fine particles" or PM2.5), and crystalline silica, which ranges across both size categories.

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DSI Dry Fog Systems can suppress the PM-10 and PM-2.5 dust from material transfer points if they are properly enclosed.

Dust generated from Stockpile activities can be controlled with DustTamer Wind Fence Systems. These fences are installed on the up-wind side of the stockpile to reduce air movement across the pile. This protection zone can prevent airborne dust generated from stackers, dozers and loading activities from leaving the site.

DSI can help you meet or exceed state standards for airborne particles (called Total Suspended Particles or TSP), and state and federal air quality standards for PM10 and for PM2.5.

Reducing dust from Stack-Out operations can be challenging.  The elevation of the Stacking conveyor above the discharge point is a major factor in how we approach the problem. If the stacker moves up and down or the pile height is maintained close to the stacker head, there are ways to use Dry Fog™ to control the dust. If not, solutions can include using a combination of the following measures: Dry Fog, Wet Suppression, Strip Curtains and DustTamer™ Wind Fence Systems.

At DSI we take a comprehensive approach because there are multiple sources of dust from stackers. Dust that is separated from the material and settles out onto the belt is the first to become airborne when it discharges from the stacker head. Ambient wind separates more dust from the material as it falls and then more dust is generated as it impacts the storage pile.

 

Reclaim Feeders are a common area where Dry Fog™ is being used.

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Feeder being fogged under a Primary Crusher
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Dry Fog™ Nozzle
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Dry Fog at Rollover Rail-car Dumper

Truck and Loader Dumps can be a very significant source of dust. Often the location of the pocket is exposed to ambient wind that carries the dust generated from the dump into the air. DSI has experience that ranges from small front-end loader dumps to 120 ton Rail-Car Dumpers to 360 ton Haul Trucks dumping into Primary Gyratory Crushers. Our Comprehensive Approach often combines DustTamer™ Wind Screens with Dry Fog™ to maximize results.

You may have tried one of the following measures with little or no success:  (for complete comparisons go to Technology-Compared to)    

Collecting dust from large open dump pockets is very difficult. Cost for collection systems can be Four Times More Expensive and still the user is faced with what to do with the collected dust.

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Start of Dry Fog at a Primary Crusher Truck Dump

Chemical systems require use of expensive chemicals and are not effective in removing dust from the air.

Water sprays can only effectively wet some of the material not the airborne dust. They create large water droplets that can freeze in wintertime operations in many regions.

Did you know that Dry Fog Systems can effectively capture airborne dust, returning it to the dump pocket, without wetting the material. Dry Fog will not freeze and can operate in temperatures as low as –35° F.

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Chile-nitrate-mine-Transfer-Point-Before-FogDust before the Dry Fog™ System was installed

 

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After Dry Fog™ System was installed only residual fog escapes the skirting cover

 Dry Fog™ Systems use very little water with nozzles rated in Gallons Per HOUR not minute.  Studies have shown that Dry Fog systems cost of operation and maintenance to be approximately 25% of that of a collection system (see Mine Cost Study). Dry Fog will not freeze and can operate in temperatures as low as –35% F.