Analysis of Dust Removal Methods for Jaw Crushers

How should dust be removed from jaw crushers? We know that crushers inevitably generate dust during production. Over time, this dust pollutes the environment and is detrimental to environmental protection. Therefore, we must devise effective dust removal solutions. For jaw crushers, dust removal can be approached from the following aspects.

1. Analysis of Dust Sources in Jaw Crushers

Primary dust generation points in jaw crushers include the feed inlet, discharge outlet, and chute. During operation, large raw rock pieces undergo compression, impact, and fragmentation before being conveyed via the chute to the lower belt conveyor. This process generates substantial dust concentrations ranging from 500 mg/m³ to 2000 mg/m³. Once generated at the source, dust disperses into the surrounding environment driven by ambient airflow, creating dust pollution.

2. Analysis of Dust Generation at the Feed Opening

Since some jaw crushers are not fully enclosed, during operation, crushed stones are squeezed and impacted. Air trapped within the stone powder gaps is forced outward at high velocity, carrying dust particles with it and instantly generating large amounts of dust. The dust-laden airflow is discharged downward through the chute (a small portion) or upward through the feed opening (the majority), resulting in high dust concentrations around the feed opening.

3. Dust Generation Analysis at the Discharge Port

After crushing, the stone material flows through the chute onto the receiving equipment (belt conveyor) beneath the crusher. Due to the height difference between the feed port and discharge port, the stone powder stream interacts with surrounding air through shear forces. Air is drawn into the material flow, causing the stone powder stream to gradually disperse. This mutual entrainment effect continuously propels dust outward. Simultaneously, the moving belt of the conveyor impacts the stone powder stream, causing dust to be instantly lifted at the discharge point and dispersed outward.

4. Methods for Controlling Dust Diffusion in Jaw Crushers:

(1) Enclosure Control. Seal dust-generating points with enclosures to minimize widespread dust dispersion.

(2) Eliminate height potential differences. Height potential differences generated by material drop-offs in hoppers, guards, chutes, and other handling equipment are primary causes of dust overflow and dispersion. Minimize drop-offs and reduce chute inclination angles. Creating negative pressure in enclosed chambers is optimal for dust collection.

(3) Wet dust suppression and exhaust ventilation. Tailor dust control measures to the source: Install spray systems at feed points and belt transfer stations, carefully controlling water volume to humidify materials and significantly reduce dust pollution at transfer points in crushing workshops. For poorly ventilated transfer points—especially underground material handling structures—employ centrifugal fans for forced ventilation, enhancing dust extraction velocity and airflow volume. When dust is generated during belt operation, utilize baghouse dust collectors with negative pressure exhaust to control dust sources.

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