The effect of two fluid spray dust removal for mine dust removal is feasible.

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At present, the dust removal technologies widely used in ore selection systems mainly include dry dust removal and wet dust removal.

1) Dry dust removal

Dry dust removal technology is widely used in bag dust removal and electrostatic dust removal. Its dust removal process is similar, which involves inhaling polluted air into the dust removal equipment, filtering it, and discharging clean gas into the atmosphere. Therefore, dry dust removal has a better dust removal effect on the air that has entered the inlet chamber. However, for unorganized emissions of dust air, due to the inability to inhale all polluted air into the air chamber, the dust removal effect is greatly reduced, resulting in poor operating environment, high occupational disease hazards, and the problem of secondary dust pollution. Due to the drawbacks of dry dust removal, most dump trucks, stacker reclaimers, and ship loaders adopt wet dust removal methods.

2) Wet dust removal

Wet dust removal mainly relies on spray dust removal and chemical dust removal, among which chemical dust removal is an extension of spray dust removal technology. Dust suppressants are added to the spray equipment to improve the dust suppression effect. The principle is to spray water on the dust generating point to increase the humidity of the material so that the dust no longer rises. It has an inhibitory effect on unorganized dust emissions. However, due to the large size of water mist particles, the ability to handle small dust is relatively low, the dust suppression effect is poor, the water consumption is high, and it cannot be used normally in winter.

2.1) Two fluid dry mist dust suppression: "When the size of water mist particles is similar to that of dust particles, the probability of adsorption, filtration, and condensation is high." When the airflow containing dust particles bypasses the droplets, the probability of the droplets capturing the dust particles in the airflow is related to the diameter of the droplets. When the fog droplets are large, the dust particles are only caught by the airflow bypassing the fog droplets. When droplets and dust particles have similar diameters, they are prone to collide and capture the dust particles. Dry fog is the application of this principle to generate fog droplets with a particle size below 5 μ m, similar to ultrafine dust particles, to effectively capture dust. Due to the fine size of the droplets, some of them will quickly evaporate in the air, causing the relative humidity in the local space to quickly saturate. The saturated water vapor will condense into dust particles as nuclei, causing the diameter of the dust particles to continuously increase until they fall. So as to control the harm of inhalable dust particles to the human body at the source of pollution.

2) Advantages of dry mist dust suppression system

Compared with other dust removal technologies in the same category, dry mist dust suppression technology is superior to other technologies in terms of treatment effect, material loss, and operating costs, making it an ideal modern dust removal device. Figure 2 presents a qualitative comparison of several dust removal methods, including dry mist dust suppression device, bag filter, electrostatic precipitator, and water spray dust suppression.

3) Dust suppression effect

The main feature of the dry mist dust suppression system is that it breaks through traditional dust suppression methods, eliminates the collection, pipeline transportation, and post-processing of dust, and directly suppresses the dust at the dust generation location, treating it from the source of dust. Dry mist dust suppression is suitable for any industrial or mining dust of any nature, and has a good control effect on inhalable human dust below 10 μ m, effectively avoiding the harm of silicosis. Suitable for open or semi open unorganized emission pollution sources (such as car feeding troughs, anti ore discharge ports, slag discharge ports, loaders, etc.), after treatment, the on-site dust concentration can be stabilized below 10-50mg/Nm3 (depending on the initial dust concentration of different materials), and even in closed unorganized emission pollution sources (such as crusher rooms, screening buildings, belt transport stations, etc.), it can reach below 3.5-10 mg/Nm3 (depending on whether the closure is good or not).