Slag treatment and recycling of metallurgical wastes

Submerged arc furnaces excel in smelting ore concentrate, calcine, pre-reduced ores, and waste materials such as deposits, flue dust, slags, refractory breakout waste, and skulls. These units are highly versatile and tailored to specific input materials and product requirements.

Product portfolio:

• AC-based submerged arc furnaces (3- or 6-electrode systems; up to 140 MVA)
• Next-generation DC furnaces for niche processes (FeCr fines, TiO₂ slag, UG2, copper, PGM, recycling)
• Custom electric smelters for ferro-alloys, non-ferrous metals and specialty feedstocks
   

BRR stems from the widely spread TBR (top blown rotary converter), which is applied in many fields for different kinds of operation and process. While it keeps it´s core competences in the field of slag treatment, aluminum and copper recycling, the narrowed field of application allows a much simpler and compact build-up.

SMS group’s DrySlag/PowerSlag systems and Paul Wurth’s INBA^® technology set new benchmarks in non-ferrous slag processing—delivering superior slag quality, energy recovery and turnkey granular-product handling.

The Lead-Tin Alloying Furnace (LTAF) process is designed to recover lead and tin from the converting slags from the non-ferrous metals industry. The slag is usually transported in a ladle via crane to the LTAF. The slag is poured the LTAF furnace. Reverts can be added with a boat if necessary. For reduction, Fe-containing material is added to the LTAF. Porous plugs (with N₂ gas) at the bottom of the furnace stirs the bath and enhances the reaction between slag and Fe phase. Other elements like Ni, Pb and Sn are partly reduced as well, forming a black copper phase with Ni, Pb and Sn impurities. The metal is tapped from LTAF into a ladle, which is placed under the furnace by ladle transfer car.