Metso Full portfolio Kaldo process
This versatile technology can be used for smelting and converting various primary and secondary raw materials such as concentrates, copper scrap, anode slimes, and e-waste. The process utilizes a top-blown rotary converter. Metso's Outotec Kaldo L Furnace is equipped with advanced charging and off-gas systems for a very compact plant layout and high operational flexibility.
Produces a high recovery of valuable metals
Lowers operating and maintenance costs
Offers high process flexibility
Versatile and efficient operations

The batch process starts with the charging of material to the furnace. Depending on the process and raw materials to be charged, this is achieved in different ways. Smelting and converting are performed by introducing water-cooled burner and converting lance.

When the processing is finished, the furnace is tilted to pour the slag and alloy to ladles located on a ladle transfer car below the furnace. The process is very compact and fully encapsulated, making it possible to ventilate the whole section to the bag filter and prevent stray emissions. Metso's Outotec process for Kaldo is a well-established solution and has substantial references globally.


  • Very flexible top-blown rotary converter technology for processing a variety of materials
  • Commonly used for treating copper anode slimes and other materials containing precious metals    
  • Burner fuel type can be selected according to customer requirements    
  • Operated in batches
  • Technology supported by HSC-Sim
  • Technology packages with experienced know-how
  • Pilot plant TBRC Kaldo L is available for tests where customers can verify and validate materials and processes before making important decisions
Read more about Kaldo L Furnace
Flexible solution for smelting and converting various primary and secondary raw materials
Why choose Metso?
  1. Complete, optimized process solutions for a diverse range of feed materials based on decades of technical expertise.
  2. Fully automated smelting solutions enable safe, stable operations leading to high recovery and availability.
  3. Minimized investment risk due to proven technology.
  4. Successful reference projects delivered for customers globally.
  5. Proven environmental compliance.
  6. Technology delivery backed by pilot testing, process guarantees, and advisory services enables fast ramp-up to design capacity.
  7. Optimized total cost of ownership.
Why choose Metso?


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