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Abstract

The recovery of the main wastes (steelmaking sludge, blast furnace sludge and dust, and sintering plant dust) of the Spanish iron and steel companies is studied. The work includes characterisation, concentration and/or depuration (by mineralogical and pyrometallurgical processes) and blast furnace recycling by pelletising and/or sintering all the recoverable elements: Fe (oxides), C (coke) and heavy metals (Pb/Zn oxides). The possibility of obtaining a satisfactory metallic phase by direct plasma smelting is also discussed. The investigation is performed at a laboratory scale and then, in certain areas, is completed in a pilot plant. From the results, an industrial plant for waste recovery is proposed, thus solving a triple problem (technical, economic and ecological). The recycling and utilisation of dust and slag formed in steel mills and blast furnaces are studied, including also the fine dust extracted from the sintering zone. Other problems considered are the elimination of Zn, Pb, Na and P from slag and dust by means of suitable heat treatments, and the production of CO(2) in the blast furnace.

Additional information

Authors: GARCIA CARCEDO F, Centro Nacional de Investigaciones Metalúrgicas, Madrid (ES)
Bibliographic Reference: EUR 13934 ES (1992) 165 pp., FS, ECU 13.75
Availability: (2)
ISBN: ISBN 92-826-3648-8
Record Number: 199210329 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: es
Available languages: es