Hot Scale & Oil Mist Collection System for Steel Mill Finishing Trains - LEFILTER Solution

Product Introduction:

LEFILTER's solution for hot strip mills tackles the complex mix of dry iron oxide scale, steam, and vaporized rolling oil (oil mist). The system often combines technologies: a primary high-temperature scale collection unit for the initial descaling and roughing stands, followed by specialized oil mist eliminators and electrostatic precipitators (ESPs) or coalescing filters for the finishing stands. Our mist collectors are designed to handle sub-micron oil aerosols at elevated temperatures, featuring corrosion-resistant internals, staged coalescing media, and automated oil drainage systems. For certain sections, high-performance wet electrostatic precipitators (WESPs) provide the ultimate solution for ultra-fine fume.

Application Area:

This system is critical in the hot rolling mill finishing train and cold rolling mills. During hot rolling, high-pressure water descaling blows off red-hot iron oxide (Fe₃O₄) scale, which is airborne and abrasive. In both hot and cold rolling, the application of rolling oils and coolants generates dense oil smoke/mist. This mixture creates a slippery, hazardous floor condition, coats electrical equipment causing failures, impairs air quality, and is a severe fire hazard. Capturing both scale and mist is essential for mill safety, asset protection, and environmental control.

Our Solution:

LEFILTER provides an engineered approach for the entire mill environment. We design targeted capture hoods over the roll bites and descaling headers to contain emissions at the source. The extracted gases are then routed through the appropriate treatment stages: cyclones or settling chambers for coarse scale, followed by advanced oil mist filtration. Our oil mist systems are designed for high collection efficiency (>95%) and continuous, automated recovery of rolling oil for potential reuse or clean disposal. The final exhaust is clean and compliant. This solution dramatically improves mill visibility and safety, reduces fire risk, prevents costly electrical and mechanical downtime, and helps meet stringent workplace air quality standards.

Call to Action:

Struggling with oil mist and scale dust in your rolling mill? LEFILTER’s integrated filtration systems are engineered for the unique challenges of metal finishing. Contact our mill specialists for an assessment.