METHOD AND DEVICE FOR PROCESSING FREE-FLOWING MATERIALS.

摘要

PCT No. PCT/DE93/00011 Sec. 371 Date Oct. 27, 1994 Sec. 102(e) Date Oct. 27, 1994 PCT Filed Jan. 6, 1993 PCT Pub. No. WO93/20252 PCT Pub. Date Oct. 14, 1993A method and apparatus for processing a contaminated free-flowing material and, in particular, filter dust from industrial metallurgical waste and domestic waste incineration plants are disclosed. In order to ensure that the end product of the plant can be reused or disposed of in an environmentally sound manner, the free-flowing material is mixed in the dry state with a reducing agent; the resulting mixture is inserted through the bore of a hollow electrode extending into a metallurgical vessel, so that the interior end of the electrode is immersed in the slag in the vessel, and the mixture is pneumatically injected through the electrode into the molten slag; heat is supplied to the mixture during the reaction between the mixture and the slag; evaporated components of the mixture are exhausted from the vessel; mixture components precipitated into the molten metal are tapped together with the molten metal; and the remaining components of the mixture which remain in the slag are discharged from the vessel together with the slag. The throughbore of the hollow electrode is connected to an arrangement for feeding and discharging gaseous media into the electrode. A power supply system includes components for maintaining a constant current and for regulating the electrical output thereof.