Boliden Aktiebolag

Douglas Sewerin Ekman

Karl Goran Gorling

Hans Ivar Elvander

Ingvar A Edenwall

Karl-Axel Melkersson

Ingvar Anton Edenwall

Carl Johan Hellestam

There is provided a method of producing a partially reduced product from finely divided metal oxide containing material. The product is suited for continued reduction and the material containing the metal oxide may be an ore concentrate or an oxidic intermediate product. The material is charged to the top of a metallurgic shaft and is contacted during its fall through the shaft with hot gases of combustion, so as to melt said material. At the same time, a carbonaceous or carbon-containing reductant is charged to the furnace, such that said molten material is converted into a partially reduced product containing solid carbon material.

Method of producing a partially reduced product from finely-divided

A bed of coke or other material having a resistivity within the range of between 10.sup..sup.-4 and 10 ohm m is heated in a reaction chamber by means of an induction coil surrounding said chamber. The heat is generated in the bed itself by passing through said coil an alternating current having a frequency of at most ten times the mains frequency. There is maintained between the least cross dimension (d) of the bed area and the penetration depth (.delta.) of the inductive field a ratio determined by the relationship ##EQU1## WHERE K IS A NUMERICAL VALUE BETWEEN 1.1 AND 1.5.

Method of carrying out heat-requiring chemical and/or physical processes

A bed comprising fluidized particulate material and having a resistivity (.rho.) between 10.sup..sup.-1 and 10 ohm m is heated in a reaction chamber by means of an induction coil surrounding said chamber. The heat is generated in the bed itself by passing an alternating current through said coil. There is maintained between the least cross dimension (d) of the bed area and the penetration depth (.delta.) of the inductive field a ratio determined by the relationship

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Helsingborg, Sweden

Douglas Sewerin Ekman