Chapter 4 – RCS dust control for specific activities

Workstation: Drying

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Tight seal

A tight seal is essential for optimal performance. It creates a seal between the rotating drum and stationary housing, preventing leaks. Proper seal maintenance is crucial for process efficiency and timely repairs or replacements help ensure smooth operation.

Use the outdoors

Outdoor installation of mineral dryers and coolers will help to reduce personal exposure to respirable crystalline silica dust, by taking advantage of natural ventilation. However, dryers and coolers that are installed outdoors will need to be designed for increased weather resistance.

Extraction and reuse

Fine dust collected by the extraction unit can be returned to the dry product if additional precautions (e.g. closed circuit) are taken to protect those who may be exposed to this dust downstream.

Exhaust fan

The exhaust fan pulls hot, dusty air through the dryer drum. Dust particles are captured in the cyclone, while only hot, moisture-laden air (steam) exits through the chimney. Regular inspection, maintenance and monitoring helps optimal efficiency and safety.

Chimney

The chimney expels exhaust gases, particles and moisture from the drying process, ensuring proper ventilation, and safe, efficient operation. Regular monitoring of emissions ensures compliance with environmental standards.

Limit exposure

Control cabins should have their own clean air supply. If needed, they should be equipped with forced air filtration and maintained under positive pressure. Dryer controls should be via telemetry, to reduce the need for operators to visit dusty areas.

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