Outokumpu Technology Oy

Heikki Siirilä

Pekka Taskinen

Jens Nyberg

Maija-Leena Metsärinta

Juha Järvi

The present invention relates to method, which helps to reduce and remove the build-up forming on the grate of a fluidized-bed furnace in the roasting of fine-grained material such as concentrate. The concentrate is fed into the roaster from the wall of the furnace, and oxygen-containing gas is fed via gas nozzles under the grate in the bottom of the furnace in order to fluidize the concentrate and oxidize it during fluidization. Below the concentrate feed point, or feed grate, the oxygen content of the gas to be fed is raised compared with the oxygen content of the gas fed elsewhere.

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Kokkola, Finland

Heikki Siirilä