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  • Investigation and evaluation of the feasibility of various processes for the reconditioning of residual and waste materials in the metal industry

Abstract

The steel industry is currently making great efforts to further increase the percentage of reconditioned residual materials. This study concerns the residual materials from gas cleaning systems. The physical processes are appropriate for the treatment of the relatively coarse-grained blast-furnace sludge. This would result in the recovery by grading of a high-zinc and a low-zinc residual ferrite fraction. Hydromeallurgical processes are suitable only for the treatment of high-non-ferrous-metal dust, free of zinc. The recirculation and reduction processes are by far the most important pyrometallurgical methods. For the treatment of the highly metallised dust from converter gas recovery plants, recirculation seems to be advantageous in terms both of energy and economy. As a result of the high net product, these processes are likely to be important in the future especially for the treatment of residues from Cr-Ni steelmaking. In view of its present development stage, and because of high reduction temperatures and reduced dusting, the rotary hearth offers positive features for the recovery of sponge iron and of zinc- and lead-rich filter dust even at low contents in the charged green pellets. In processes with circulating fluidised bed, the problems raised by dust transport, reduction and separation as well as by the further processing on the fine-grained high-iron product will have to be solved.

Additional information

Authors: HARP G, Betriebsforschungsinstitut, Verein Deutscher Eisenhüttenleute, Düsseldorf (DE);KLIMA R, Betriebsforschungsinstitut, Verein Deutscher Eisenhüttenleute, Düsseldorf (DE);STEFFEN R, Betriebsforschungsinstitut, Verein Deutscher Eisenhüttenleute, Düsseldorf (DE)
Bibliographic Reference: EUR 12613 DE (1990) 232 pp., FS, ECU 20
Availability: (2)
ISBN: ISBN 92-826-1265-1
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