Boliden Aktiebolag

Ingvar A Edenwall

Karl Goran Gorling

Hans Ivar Elvander

Douglas Sewerin Ekman

Thomas K Mioen

Karl-Axel Melkersson

Carl Johan Hellestam

Jan-Olof Jansson

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 method for recovering copper and/or other non-ferrous metals from sulphidic raw material by roasting the material to a substantially sulphur-free state and then in a separate furnace sulphatize the roasted material into a form of a readily soluble sulphate and/or basic sulphate and then leaching the sulphatized material with an aqueous sulphuric acid solution. Copper and/or other non-ferrous metals are recovered from the spent leaching solution. The leaching solution is after said recovering recirculated to the leaching stage and to the roasting stage.

Method of recovering non-ferrous metals from sulphidic materials

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

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

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Helsingborg, Sweden

Ingvar A Edenwall