Boliden Aktiebolag

Ingvar Anton Edenwall

Karl Goran Gorling

Hans Ivar Elvander

Douglas Sewerin Ekman

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.

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BOTH OF, Helsingborg, undefined

Ingvar Anton Edenwall