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Metso is introducing the compact 4th generation Outotec® Kaldo L Furnace, ©Metso
Outotec Kaldo L Furnace

Metso Introduces Furnace for Higher Recovery of Metals

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Autor: B S

Datum: 05. Apr. 2024

April 2024 | Metso introduces fourth generation of its Outotec Kaldo L Furnace. The compact furnace is built for higher recovery of metals.

Metso is introducing the compact 4th generation Outotec® Kaldo L Furnace for flexible processing and optimal recovery of metals. The upgraded heavy-duty furnace is ideally suited for the melting, reducing and converting of various primary and secondary raw materials such as concentrates, copper scrap, anode slimes and e-waste.

The Kaldo L Furnace features smooth movement with improved process control. It is also equipped with advanced charging and off-gas systems, enabling a very compact plant layout and high operational flexibility. The technology is part of Metso’s Planet Positive offering.

“We are excited to launch the upgraded Kaldo L Furnace to the market. It will benefit our customers through an increased recovery of metals and longer equipment lifetime with efficient materials handling in a compact process,” explains Jonny Eliasson, Director, Non-Ferrous and Smelting Recycling at Metso.

Metso’s Outotec® Kaldo technology is a well-established solution and has several references globally. It has been successfully used in the precious metals, copper, and lead processing industries for decades and represents the best available TBRC technology for this purpose. Metso has continuously developed the Kaldo Furnace since the 1970s and has substantial references globally.  An Outotec® Kaldo L pilot plant is available for performing customer tests to validate materials and processes.

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The system is fully encapsulated by a furnace casing, thus facilitating ventilation of the whole section, including the ladle car below the furnace. Stray emissions are prevented, resulting in a safe working environment. An advanced hydraulic system allows smooth and safe control of any movement. The heating and converting processes are performed by introducing water-cooled lances mounted in lance wagons with a hydraulic drive. Find out more about Metso’s Outotec® Kaldo L Furnace on

Metso aims to be a frontrunner in sustainable technologies, end-to-end solutions and services for the aggregates, minerals processing and metals refining industries globally. Headquartered in Espoo, Finland, Metso employs over 17,000 people in close to 50 countries and sales for 2023 were about EUR 5.4 billion. The company is listed on the Nasdaq Helsinki.


(Source: Metso Corporation/2024)