Mining crushing and screening dust control: professional selection guide for dust removal equipment
May 16,2026
In the mining and aggregate processing industries, crushing and screening are the core processes that generate high concentrations of dust. These dust particles not only have a wide particle size distribution (from 0.1 microns to over 100 microns) and large fluctuations in instantaneous concentration, but also often come with high temperature or high wear characteristics caused by material impact. Therefore, the selection of dust removal equipment for this working condition cannot simply apply universal standards, but must be scientifically configured based on a systematic thinking of "source suppression, process control, and end of pipe treatment".
1、 Core equipment selection: Pulse bag dust collector
At present, pulse bag filter has become the mainstream choice for the treatment of the end of mining crushing and screening lines due to its extremely high capture efficiency and stable operating performance. When selecting, it is important to focus on the following core technical parameters:
1. Reasonable setting of filtering wind speed: Mine dust concentration is usually high. In order to reduce equipment resistance and extend the life of the filter bag, the filtration air speed should not be too high. It is generally recommended to control it between 0.8m/min and 1.2m/min. For ore dust with a large amount of coarse particles or high viscosity, a lower value should be taken appropriately.
2. Accurate matching of filter material: The filter bag is the "heart" of the dust collector. Under normal temperature and dry conditions, the use of polyester needle punched felt treated with PTFE film can meet the requirements of efficient filtration; If dealing with high-temperature clinker or corrosive ores, temperature resistant and corrosion-resistant filter materials such as PPS, aramid, or fiberglass should be selected; If it involves flammable and explosive environments such as coal dust, anti-static and flame-retardant filter materials and corresponding explosion-proof pressure relief devices must be equipped.
3. Efficiency of the dust cleaning system: An efficient pulse blowing system can ensure timely removal of dust from the surface of the filter bag. In response to the frequent concentration peaks in the crushing workshop, adopting offline ash cleaning mode can effectively avoid the "secondary adsorption" of dust and ensure long-term operational stability.
2、 Pre processing: Combination Fist of Multi level Dust Removal
Relying solely on the end bag dust collector often poses a risk of overload when facing extremely high concentration dust sources such as the crusher feed inlet and discharge point. Therefore, it is crucial to introduce pre-processing equipment:
4. Gravity settling chamber and cyclone dust collector: Before the dusty gas enters the bag filter, it is first pretreated through the gravity settling chamber or cyclone dust collector. These two devices utilize physical principles to pre separate coarse particles larger than 50 microns in the airflow. This not only recovers some valuable ore powder, but also significantly reduces the filtration load on the rear bag, effectively preventing the filter bag from being damaged due to coarse particle erosion.
5. Sealed hood and diversion design: Scientific sealed dust hoods must be installed at the dust production points of crushers and vibrating screens, and buffer chutes must be used to reduce material drop, reduce dust diffusion from the source, and improve dust collection efficiency.
3、 System layout and operation considerations
In practical engineering applications, the layout of the dust removal system also affects the final treatment effect. For crushing buildings with concentrated dust production points, it is recommended to use a centralized large-scale dust removal system for unified management and maintenance; For dispersed mobile crushing stations, vehicle mounted modular dust removal units can be considered.
In addition, mining conditions are often harsh, and the supporting ash unloading and conveying systems must have good sealing to prevent secondary dust. In daily operation and maintenance, monitoring the pressure difference changes at the inlet and outlet of the dust collector is also a key basis for judging the status of the filter bag and developing a scientific maintenance plan.
The dust control in the crushing and screening process of mines is a systematic project. By combining efficient pre-processing equipment with precisely selected pulse bag filters, not only can the emission concentration be ensured to meet national environmental standards, but also materials can be effectively recovered and energy consumption can be reduced, providing solid technical support for green and sustainable production in mines.
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