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china manufacturer multi layer laboratory test small vibrating screen

Vibrating Screen

Vibrating Screen

Vibrating feeder is also called vibratory feeder or ore vibrating feeder.

Processing capacity:1-105t/h

Feeding size:125-250mm

Feed opening: 150×250-300×1300mm

Applied Materials: Pebbles, granite, basalt, iron ore, limestone, quartz stone, gangue, construction waste.

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transparent air filter for high-efficiency pm 2.5 capture

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Particulate matter (PM) pollution has raised serious concerns for public health. Although outdoor individual protection could be achieved by facial masks, indoor air usually relies on expensive and energy-intensive air-filtering devices. Here, we introduce a transparent air filter for indoor air protection through windows that uses natural passive ventilation to effectively protect the indoor air quality. By controlling the surface chemistry to enable strong PM adhesion and also the microstructure of the air filters to increase the capture possibilities, we achieve transparent, high air flow and highly effective air filters of ~90% transparency with >95.00% removal of PM2.5 under extreme hazardous air-quality conditions (PM2.5 mass concentration >250 μg m−3). A field test in Beijing shows that the polyacrylonitrile transparent air filter has the best PM2.5 removal efficiency of 98.69% at high transmittance of ~77% during haze occurrence

transparent air filter for high-efficiency pm 2.5 capture

Particulate matter (PM) pollution in air affects people’s living quality tremendously, and it poses a serious health threat to the public as well as influencing visibility, direct and indirect radiative forcing, climate, and ecosystems1,2,3,4,5,6,7. PM is a complex mixture of extremely small particles and liquid droplets1,8. On the basis of the particle size, PM is categorized by PM2.5 and PM10, which refer to particle sizes below 2.5 and 10 μm, respectively. PM2.5 pollution is particularly harmful since it can penetrate human bronchi and lungs owing to the small particle size9. Hence, long-term exposure to PM2.5 increases morbidity and mortality10,11,12,13,14. Recently, there have been serious PM pollution problems in developing countries with a large manufacturing industry such as China. Figure 1a,b shows images of a location in Beijing during clear and hazy days, respectively. During hazy days, the visibility decreased greatly and the air quality was poor because of extremely high levels of PM2.5

(a) Photograph of a random place in Beijing during a sunny day. (b) Photograph of the same place in Beijing during a hazy day with hazardous PM2.5 level. (c) Schematics of porous air filter capturing PM particles by size exclusion. (d) Schematics of bulky fibrous air filter capturing PM particles by thick physical barrier and adhesion. (e) Schematics of transparent air filters that capture PM particles by strong surface adhesion and allowing a high light and air penetration

Measures taken by the public during hazy days are mostly focused on outdoor individual protection, such as using mask filters, which are often bulky and resistant to air flow15. In indoor spaces, protection is only available in modern commercial buildings through filtering in ventilation systems or central air conditioning; residential housing seldom has filtration protection from PM. Moreover, all these active air exchanges by mechanical ventilation consume enormous amounts of energy because of the massive use of pumping systems16. When people stay indoors without sufficient air exchange, indoor air quality is also of great concern17. It would be ideal if passive air exchange—that is, natural ventilation—through windows could be used for indoor air filtration. Owing to the large surface area of most windows, air exchange is very efficient. Protection at windows requires the air filters to not only possess a high PM-capture ability but also a high optical transparency for natural lighting from the sun and sight-viewing at the same time. Here we introduce the concept of a transparent air filter for indoor air-quality protection at the window for the first time

transparent air filter for high-efficiency pm 2.5 capture

The PM2.5 pollution particles in air have complicated compositions including inorganic matter (such as SiO2, SO42− and NO3−) and organic matter (such as, organic carbon and elemental carbon) from diverse sources including soil dust, vehicular emission, coal combustion, secondary aerosols, industrial emission and biomass burning1,18,19,20,21. The behaviour of PM particles are different because of their chemical compositions, morphologies and mechanical properties15. Some rigid inorganic PM particles are mainly captured by interception and impaction on a filter surface. Some soft PM containing a lot of carbon compounds or water such as those from combustion exhaust would deform on filter surfaces and require stronger binding during the process of attaching to the filter. It is important to study the surface properties of the air filters to enhance PM particle capture. However, in existing air filter technology, not much work has been performed to study the properties of filter materials. There are two types of air filters in common use15. One is a porous membrane filter, which is similar to a water filtration filter (shown in Fig. 1c). This type of air filter is made by creating pores on solid substrate, and it usually has very small pore size to filter out PM with larger sizes and the porosity of this type of filter is low (<30%). Hence, the filtration efficiency is high, although the pressure drop is large. Another type of air filter is a fibrous air filter, which captures PM particles by the combination of thick physical barriers and adhesion (shown in Fig. 1d). This type of filter usually has porosities >70% and is made of many layers of thick fibres of diverse diameters from several microns to tens of microns. To obtain a high efficiency, this type of filter is usually thick. The deficiency of the second type of filter is the bulkiness, nontransparency and the compromise between air flow and filter efficiency

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