Efficient and flexible calcination with the multiple hearth furnace

Process materials with moisture content over 50%

The design of the MHF – with its multiple stacked round hearths – means it can process raw materials with very high moisture contents without pre-drying, saving time and energy. It’s a significant advantage over rotary kilns used in the same applications, and particularly important when dealing with very fine flotation concentrates and other valuable ores.

Precisely control temperature profiles ± 5°C

Our multiple hearth furnaces allow close monitoring and control of the temperature profile within the individual hearths, reducing energy consumption and delivering optimal control of the process for maximum production and product quality. It's especially beneficial in applications where overheating of the raw materials has a detrimental impact on product quality.

Process particle sizes from 0mm to 40mm

Able to process a broad range of particle sizes, the MHF offers remarkable flexibility in the types of ores and raw materials it can handle. Most notable, however, is its ability to thermally treat very fine materials under tightly controlled atmospheric and temperature conditions, ensuring these materials are processed consistently and correctly.

Zero product loss through internal dust recycling

Despite often processing very fine materials, no material is lost from the multiple hearth furnace, as 100% of the filter dust can be recycled into the process. This ensures excellent production efficiency and zero product losses – a critical advantage over other calcination technologies.

Support mine waste valorisation

Thanks to its ability to process fine and unstable raw materials, our multiple heath furnaces can play a key role in the extraction of valuable ores from previously discarded fine raw materials and tailings.