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Author:
Nikulin V, Head of Engineering
Nikulin V, Head of Engineering
To help industrial facilities that generate concrete dust achieve the required level of air purification, various types of concrete dust extractors are used. Before purchasing such a system, it is important to understand the upfront design requirements.
Concrete Dust Characteristics That Drive Extractor Design
Concrete dust, particularly that generated during grinding, demolition, or cutting, contains a high proportion of respirable crystalline silica (RCS), including difficult-to-capture particles smaller than 0.3 microns. These fine particles are accompanied by larger ones, which, when impacting surfaces at high speeds, can damage filter media. Effectively capturing both size fractions require a two-stage approach: first, a coarse filter to capture larger particles, followed by a fine filter to remove the submicron particles responsible for silicosis in humans.
This is why special considerations are necessary for concrete dust extraction. The highly abrasive nature of quartz particles found in concrete means it acts like sandpaper and can quickly wear down filtration system components. To prevent abrasion, the inner walls of air ducts, fan volutes, and housings must be reinforced or coated with protective materials. Additionally, concrete contains calcium oxides. When these come into contact with water, they form a caustic alkali that can corrode system casings and components, as well as form a hardened crust on filter surfaces.
This is why special considerations are necessary for concrete dust extraction. The highly abrasive nature of quartz particles found in concrete means it acts like sandpaper and can quickly wear down filtration system components. To prevent abrasion, the inner walls of air ducts, fan volutes, and housings must be reinforced or coated with protective materials. Additionally, concrete contains calcium oxides. When these come into contact with water, they form a caustic alkali that can corrode system casings and components, as well as form a hardened crust on filter surfaces.
Cutting process requiring a dust extractor
Therefore, a concrete dust extractor must incorporate the following features: a stainless steel or corrosion-resistant coated casing; a drainage hole for moisture management; and filters made from non-moisture-absorbing materials such as synthetics or Teflon-coated polyester.
The most demanding challenge for any extraction system is peak dust load—when a large volume of solids instantly attacks the filter, forming a thick layer that impedes airflow. This can be mitigated by specifying a nominal capacity 30–50% higher than that required for a clean filter. It also requires using fans with a steep pressure curve to maintain airflow through the growing solids layer on the filter media.
The most demanding challenge for any extraction system is peak dust load—when a large volume of solids instantly attacks the filter, forming a thick layer that impedes airflow. This can be mitigated by specifying a nominal capacity 30–50% higher than that required for a clean filter. It also requires using fans with a steep pressure curve to maintain airflow through the growing solids layer on the filter media.
Torch-Air portable dust extractor
Torch-Air Expert Tips on Dust Extraction
Key Structural Elements of the System
Regardless of its operating principle, any removal system includes the following basic components:
- Inlet (air intake);
- Housing;
- Collection hopper;
- Dust discharge device;
- Outlet;
- Fan;
- Control system.
Overview of PASSAT Automatic Portable Pulse Jet Dust Exctractor
Types of Concrete Dust Extractors
Depending on specific production conditions, the choice of concrete dust extraction systems will depend on the required level of filtration and may include one of the following technologies (or a combination of these):
- Cyclones – Air enters a cylindrical or conical chamber, where a vortex is created, forcing larger, heavier particles toward the walls, where they lose momentum and fall into a collection hopper;
- Baghouse configuration – Air is drawn through a fabric bag, which traps a layer of dust on the outside of the bag, allowing clean air to pass through.
- Cartridge configuration – These utilize pleated filter media (often polyester) formed into rigid cylindrical cartridges. Air passes through the media, trapping particles on the surface;
Criteria for Selecting Equipment for Concrete Work
Key criteria:
The table below illustrates how to select a system based on these criteria.
- Airflow rate – measured in cubic meters per hour (m³/h) and dictates the volume of air the system can move;
- Filtration class – defines the system's ability to capture particles of a given size;
- Type of connected tool – portable power tools have different requirements than stationary industrial processes;
- Operating conditions (humidity, temperature, continuity) – the environment in which the extractor operates dictates the choice of materials and system design;
- Maintenance and consumables – the total cost of ownership is heavily influenced by maintenance needs and the service life of consumable components.
The table below illustrates how to select a system based on these criteria.
GIF Animation of a Portable Bag Dust Exctructor in Action
FAQ
- 1. Can multiple tools be connected to a single extractor at the same time?Yes, but this requires proper calculation of the overall system capacity and duct diameter.
- 2. What hoses are needed to connect to a concrete tool?Grounded, anti-static hoses are required.
- 3. How often should the contaminants bin be emptied?This depends on the workload intensity, but the bin should not be filled beyond two-thirds of its capacity to prevent contaminants from returning to the filters.
- 4. What safety standards must be considered when selecting an extractor?Local occupational health and safety regulations, along with the required explosion protection classification.
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We always perform precise calculations and offer expert assistance in selecting the optimal dust collection or gas cleaning systems, typically completing this process within 1 to 2 days
Head of Engineering,
Vladimir Nikulin
Vladimir Nikulin
CALCULATION AND SELECTION
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