Examination and assessment of application possibilities of various processes for treatment of iron and steelwork residual and waste materials
In order to increase the percentage of reconditioned residual materials from gas cleaning systems in the steel industry, a study was made of possible new methods of treatment. Information was compiled from a literature survey and from discussions with the plant operators and designers. 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 fraction. Hydrometallurgical processes are mainly designed to allow the recovery of non-ferrous metals and therefore are suitable only for the treatment of high-non-ferrous-metal dust. However, in order to prevent leaching problems, this dust has to be largely free of zinc ferrite. 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. The treatment of residual materials by recirculation in the electric-arc furnace or by plasma processes requires the use of cost-intensive electric power. 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. The rotary hearth and low shaft furnace processes are primarily aimed at the recovery of the iron, and thus of the main residue component.
Bibliographic Reference: EUR 12613 EN (1990) 227pp., FS, ECU 20
ISBN: ISBN 92-826-1266-X
Record Number: 199010988 / Last updated on: 1994-12-01
Original language: en
Available languages: en