Reference to Magnesium Dust Collection Requirements:
NFPA 484 (Standard for Combustible Metals), Section 9.3.2, requires that magnesium dust from grinding, buffing, or wire brushing must be collected using a liquid precipitation-type separator.
The International Fire Code (IFC 2021), Section 2205, also references proper dust collection for combustible metals like magnesium.
Why Use a Liquid Precipitation-Type Separator?
Magnesium dust is highly combustible and reacts violently with air and moisture.
A liquid precipitation-type separator prevents dust accumulation and ignition by using a liquid medium to safely capture and neutralize metal dust particles.
Other collection methods can generate static electricity or allow dangerous dust accumulation, increasing fire and explosion risks.
Clarification of Incorrect Answer Choices:
A. Cloth screen arrestor → Incorrect
Not effective for combustible metal dust, as magnesium dust can ignite easily and pass through fabric filters.
B. Low-pressure cyclone → Incorrect
Cyclones are used for larger particulate matter, but not suitable for fine magnesium dust due to fire and explosion hazards.
C. Dry-type dynamic precipitator → Incorrect
Dry-type systems can accumulate magnesium dust, creating an explosion hazard.
Conclusion:
The correct and verified answer is D (liquid precipitation type of separator) based on NFPA 484 Section 9.3.2 and IFC 2205, ensuring safe collection of magnesium dust during grinding, buffing, or wire brushing operations.
