Considering the inherent properties of the material and global technological trends, TSU invested in the German-engineered Waelz Kiln process to treat Electric Arc Furnace (EAF) dust. Our two kilns possess a combined total annual design capacity of 198,900 metric tons.

The Waelz Kiln process utilized by TSU is a mature and stable commercial technology with decades of proven success in Europe, the US, and Japan. In this process, pelletized alkaline SRP dust is mixed with coke and slagging agents (including recycled refractories, contaminated soil, organic sludge, lime/slaked lime, and incinerator fly ash) and fed via conveyor into our rotary kilns—measuring 3.6m x 40m (Kiln No. 1) and 3.6m x 50m (Kiln No. 2). Smelting occurs at 1300°C with a reaction time of 5 to 6 hours. This not only enables the recovery of valuable metal resources but also transforms hazardous waste into stable, harmless, and fully reusable Waelz slag.