ArcelorMittal has recently tasked Primetals Technologies with upgrading two LD converters (BOFs) at its steel mill in Jõao Monlevade, Brazil. The order includes two new 135-tonne converters, an upgrade on the primary dedusting systems, and complete electrical and automation packages.
Significant reduction in emissions
In addition to the technological advantages of the new systems, the key factors influencing ArcelorMittal’s decision were other recently completed projects, such as the new desulphurisation plant which came online in 2018.
ArcelorMittal had also over time forged a strong partnership with Primetals Technologies in Brazil. The upgraded wet-type primary dedusting systems will filter the dust from the converters and direct it to a water treatment system. The resulting emissions will be well below the limit set by the Brazilian government. In addition, the new solution will require significantly less maintenance than the systems used to date, in turn improving the steel plant’s availability.
Shorter production cycles
Primetals Technologies will supply vessels, trunnion rings, suspension systems, tilting drives, bearings, pedestals and new off-gas cleaning systems for both new converters. A maintenance-free suspension system, Vaicon Link 2.0, will keep the converter stable and allow thermal expansion in all directions. Vaicon Stopper, a slag retention system, will minimize the amount of slag that enters the ladle during tapping. This system will ensure shorter production cycles and higher steel quality compared with conventional slag retention systems.
Primetals Technologies will also supply a complete electrics and automation package, including basic (Level 1) automation, motors and drives. The new equipment is scheduled for start-up in the first quarter of 2025.
With a history spanning close to 90 years, ArcelorMittal Monlevade produces wire rod for industrial applications such as steel wool and steel cord. The site is part of ArcelorMittal Brazil’s Long Steel Division and has an annual capacity of 1.2 million tonnes.
