1.What are the effects on the respiratory tract?
Short-term irritation: Dust (especially metallic dust) irritates the nasal cavity, throat, and trachea, causing symptoms such as cough, phlegm, sore throat, nasal congestion, or runny nose.
Long-term damage:
Pneumoconiosis: Long-term inhalation of high concentrations of metallic dust (such as iron, zinc, aluminum, etc.) can lead to metallic pneumoconiosis. This is a fibrotic disease of the lung tissues. Although its severity is generally less than silicosis, it can still cause decreased lung function, difficulty breathing, and chronic cough.
Chronic bronchitis: Persistent irritation can lead to chronic inflammation of the airways.
Asthma or exacerbation of existing respiratory conditions.
2.What are the risks of heavy metal toxicity?
If the steel being processed contains or is coated with heavy metals such as lead, chromium, cadmium, and manganese, the dust from these metals can be inhaled or enter the body through the hand-to-mouth route, potentially causing chronic heavy metal poisoning and damaging the nervous, renal, circulatory, and skeletal systems. For example, manganese poisoning can affect the nervous system.
3.What are the main sources of dust?
Cutting processes: Metal vapor and oxide particles generated during shearing, laser cutting, and plasma cutting.
Grinding and trimming: Fine metal particles generated during the removal of burrs and welding marks.
Surface treatment: Dust generated during sandblasting and polishing.
Handling and moving: Dust from the oxide layer (rust) or rust-preventive oil on the surface of the coil material is stirred up during movement.
4.What are the key protective measures?
Engineering Controls:
Local Exhaust Ventilation (LEV): Install dust collection hoods above or to the sides of dust-generating points such as cutting and grinding areas to capture dust at its source.
Wet Operations: Employ wet cutting or grinding where feasible to significantly reduce dust emissions.
General Workshop Ventilation: Ensure good overall ventilation to dilute the concentration of dust in the air.
Administrative Controls:
Establish dust-free rest areas and clean dining areas.
Provide occupational health and safety training to employees to ensure they understand the hazards and protective measures.
Develop and strictly enforce cleaning protocols, using industrial vacuum cleaners (never dry sweep) to regularly remove accumulated dust.
5.What personal protective equipment is available?
Respiratory protection: Wear an appropriate dust mask (such as an N95/KN95 mask; for high concentrations or finer dust, a half-face or full-face mask with a dust filter may be necessary) depending on the dust concentration and particle size.
Eye protection: Wear dust-proof goggles or protective eyewear.
Body protection: Wear dust-proof work clothes to avoid bringing dust home. Shower and change into clean clothes promptly after get off work.