At the Ironmaking Plant – Hoa Phat Dung Quat, dust and fine material particles from coke, sinter and pellets are collected through dust extraction hoods installed above the conveyors. The dust stream then passes through a duct network across different levels, converges into the main duct and is conveyed to the material storage silo.

The material particles are small, hard and sharp. When moving at high velocity through the dust extraction system, they continuously impact the internal surfaces, particularly at the extraction hood inlets and at bends and elbows. During the site survey, GAC identified multiple locations that had worn through and required patch welding. Dust leakage caused material loss, affected the surrounding environment and increased the energy consumption of the extraction system.

Based on the existing condition, GAC proposed redesigning the extraction hoods, duct sections, bends and elbows for each specific location within the existing system. The replacement components were internally lined with Kalcret hard compound at a thickness of 20–30 mm, focusing protection on surfaces directly exposed to the dust and material particle stream.