Typical Details On Capital Investment And Operating Costs
Stone crusher: typical details on capital investment and operating costs
According to the field studies, the economic aspects of the stone crusher(
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Sources of Emissions
All quarrying and stone processing operations including surface mining, crushing, screening, material handling and transfer operations are potential sources of particulate emissions. These sources may be categorized as process sources. Fugitive dust sources generally involve the re-entrainment or settled dust by wind or machine movement. Factors effecting emissions include the type, quantity and the moisture content of the rock processed, the type of equipment and operating practices employed as well as topographical and climatic factors.
Emission during Mining Activity
Fugitive Emissions are generated during various mining activities such as drilling, blasting, excavation, breaking and loading etc. In some bigger mines the primary blasting emissions are quite substantial over a large area. The emissions during secondary blasting are also substantial but lesser compared to primary blasting.
Emission during Transportation
During transportation of stones by heavy vehicles like trailers, trucks, fugitive dust emission occur due to movement of heavy vehicles on roads. The quantity of emissions depends on various aspects like climatic conditions, moisture in the soil, speed of the vehicle, frequency of the vehicles etc. Generally such emissions can be controlled to a great extent by spraying water on these roads intermittently(
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Emission during Crushing Operation
During crushing operation, generation of particulate emissions is inherent and the emissions are most apparent at stone crusher feed and discharge points. The greater the reduction in size during subsequent crushing stages from primary, secondary to tertiary crushing, the higher the emissions.
Emissions during Screening
In the screening section, the mixture of stones is classified and separated according to size. Generally the screening efficiency is considered to be in the range of 60 to 75%. The screening equipments commonly include grizzlies, shaking screens, vibrating screens and revolving screens. Although screening may be performed wet or dry, dry screening is the most common.
Emissions during Material Handling
In the material handling section, various handling devices like feeders, belt conveyors, bucket elevators and screw conveyors are used to transport crushed materials from one point to another. Particulates may be emitted from any of the material handling operations. Most of the emissions occur at transfer points.
Nature and Spread of Emissions
The dust is generated primarily due to size reduction and handling of the stones at various stages. The major source of dust generation is during size reduction in the primary, secondary and tertiary crushers. More fine dust is generated in secondary crusher as compared to primary crusher. The dust is also generated during handling of stones, especially at the point where the stones fall through a height from places like one belt to another or from belt to hopper or stock piles etc. During vibratory screen large quantity of fine dust is emitted.
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by: xjddb
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