Outokumpu Oy

Martti J Jankkila

Matti E Honkaniemi

Risto M Heikkila

Launo L Lilja

Lauri A Mustikka

Pentti O Hokkanen

Heikki Tuovinen

Frans H Tuovinen

Helge J Krogerus

Tarmo K Mantymaki

Matias A Virta

Bengt J Norrman

Aimo A Nurminen

Veikko Iisakka

Erkki Lajunen

Kauko K Rinne

The invention relates to an apparatus for measuring the length of the electrodes in an electric furnace, wherein by aid of the apparatus of the invention, into the furnace there is inserted a measuring rod which feels the end of the electrode in the furnace, and thus the distance of the electrode located in the material bed is detected with respect to the furnace bottom.

Apparatus for measuring the length of electrodes in an electric furnace

The present invention relates to a method and apparatus for preparing a feed mixture, made of several batch components, at one stage in order to feed it into a smelting furnace. The preparation of the batch may include the preheating and drying of the material, the removal of crystal waters and evaporable substances as well as the conduction of the batch into the smelting furnace. According to the invention, a hot inert gas is conducted through a downwards settling batch so that the gas is mixed into the batch as well as possible, but even partial fluidization is prevented. The apparatus of the invention comprises a pretreatment silo (6) which is uniform at the upper part but is divided into several sub-silos (7) at the lower part. At the lower part of the sub-silos there are connected ducts (8) wherealong the batch flows into the smelting furnace (9) located below the pretreatment silo (6). In between the sub-silos (7) there is located the gas distribution chamber (34), wherefrom the gases are distributed through the distribution ducts (35) extending to the sub-silos and the gases are discharged at the top (41) of the silo (6). The employed gas is obtained by means of burning the exhaust gases (10) from the smelting furnace and by combining them with cleaned circulation gases (25).

Apparatus for batch preparation and feeding into the smelting process

The present invention relates to a method and apparatus for preparing a feed mixture, made of several batch components, at one stage in order to feed it into a smelting furnace. The preparation of the batch may include the preheating and drying of the material, the removal of crystal waters and evaporable substances as well as the conduction of the batch into the smelting furnace. According to the invention, a hot inert gas is conducted through a downwards settling batch so that the gas is mixed into the batch as well as possible, but even partial fluidization is prevented. The apparatus of the invention comprises a pretreatment silo (6) which is uniform at the upper part is divided into several sub-silos (7) at the lower part. At the lower part of the sub-silos there are connected ducts (8) wherealong the batch flows into the smelting furnace (9) located below the pretreatment silo (6). In between the sub-silos (7) there is located the gas distribution chamber (34), wherefrom the gases are distributed through the distribution ducts (35) extending to the sub-silos and the gases are discharged at the top (41) of the silo (6). The employed gas is obtained by means of burning the exhaust gases (10) from the smelting furance and by combining them with cleaned circulation gases (25).

Method and apparatus for batch preparation and feeding into the smelting

Method and device for clamping the electrode contact shoes around the

Electric furnace dome

A method and device for facilitating the maintenance and replacing of the contact shoes of the electrodes in an electric-arc furnace, the supporting mantle of the contact shoes consisting of two sections, the lower one of which can be lifted, together with the contact shoes, telescopically over the upper section, whereby the contact shoes rise above the furnace hood.

Method and device providing mobility to a contact shoe independent of an

Growing community of inventors

Tornio, Finland

Martti J Jankkila