Outotec Oyj

Outokumpu Oyj

Outotec (finland) Oy

Outokumpu Technology Oy

Maija-Leena Metsärinta

Pekka Taskinen

Jens Nyberg

Satu Jyrkönen

Aija Rytioja

Jussi Liipo

Madeleine Scheidema

Juha Järvi

Pekka Kurki

Heikki Siirilä

A process of treating complex sulfide concentrate includes the steps of roasting wet or slurried complex sulfide concentrate in a furnace at a temperature of at least 720&#xb0; C. to obtain a calcine; smelting the calcine under inert or oxygen free atmosphere in a smelting furnace to obtain a matte, and optionally granulating the matte to obtain a granulated matte.

Treatment of complex sulfide concentrate

The invention relates to a method for thermally processing &#x3b1;-spodumene, i.e. lithium aluminum silicate, by which treatment it is transformed into &#x3b2;-spodumene, which is more advantageous for further processing; in the method, concentrate or ore with a grain size of 20-1,000 &#x3bc;m is processed in a fluidized bed reactor, at a temperature of 800-1,000&#xb0; C., by using an oxygenous gas as the fluidizing gas.

Method for processing spodumene

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.

Method for reducing build-up on a roasting furnace grate

This invention relates to a method for stabilizing a fluidized bed used in roasting by adjusting the oxygen content of the roasting gas in the bed. The fine-grained material for roasting is fed into the furnace above the fluidized bed and the roasting gas, which causes the fluidizing, is fed into the bottom of the furnace through a grate. In this method, the total amount of oxygen in the roasting gas to be fed and the average total oxygen requirement of the material to be roasted are calculated and the ratio between them regulated so that the oxygen coefficient in the bed is over 1.

Method for the stabilization of a fluidized bed in a roasting furnace

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Vanha-Ulvila, Finland

Maija-Leena Metsärinta