A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Steel-slag as filler material in concrete
The legislation for the disposal of heavy metals contaminated substances is still going to be tightened up in the future. The main criteria for the utilization or deposition of these residues are the content and the water solubility of these metals. Through this, the use of slags from the lead- and zinc-industry in road building may become limited or even not possible at all. From an economic point of view this would lead to Pb/Zn losses and costs for safe dumping. This paper investigates the feeding of the reducing agent via hollow electrode DC smelting and the yield of metal reduction. After carrying out thermodynamic calculations, the process window conditions for electric-arc furnace tests were determined. Doing this, the zinc could be reduced, evaporated and recovered as an oxidic intermediate product flue dust, while the lead was present either in flue dust or in metallic form. The zinc content in the final slag could be reduced by up to 90%. The slag product has undergone an eluation test which allows it to be used as building materials. The investigations point out that the combination of arc furnace processing and charging of carbon bearing material by hollow electrode technique is a favourable combination for reducing zinc and lead contents in slags and return the metals to the material cycle. More zinc is won in flue dust bearing contents of lead than flue dusts from fuming plants, so that the flue dust can be used directly as a raw material in hydrometallurgical or pyrometallurgical zinc production. Lead is won as crude lead for refining. The treated slag is a useable raw material for building materials. The values of zinc and lead - which are critical for environmental friendly use - are reduced to concentrations below 1% of zinc and 0.1 % of lead. The iron is mainly reduced to FeO and in parts to metallic iron (i.e 10% of total Fe) in this process. But under the prevailing conditions accretions are not expected.
Steel-slag as filler material in concrete
The legislation for the disposal of heavy metals contaminated substances is still going to be tightened up in the future. The main criteria for the utilization or deposition of these residues are the content and the water solubility of these metals. Through this, the use of slags from the lead- and zinc-industry in road building may become limited or even not possible at all. From an economic point of view this would lead to Pb/Zn losses and costs for safe dumping. This paper investigates the feeding of the reducing agent via hollow electrode DC smelting and the yield of metal reduction. After carrying out thermodynamic calculations, the process window conditions for electric-arc furnace tests were determined. Doing this, the zinc could be reduced, evaporated and recovered as an oxidic intermediate product flue dust, while the lead was present either in flue dust or in metallic form. The zinc content in the final slag could be reduced by up to 90%. The slag product has undergone an eluation test which allows it to be used as building materials. The investigations point out that the combination of arc furnace processing and charging of carbon bearing material by hollow electrode technique is a favourable combination for reducing zinc and lead contents in slags and return the metals to the material cycle. More zinc is won in flue dust bearing contents of lead than flue dusts from fuming plants, so that the flue dust can be used directly as a raw material in hydrometallurgical or pyrometallurgical zinc production. Lead is won as crude lead for refining. The treated slag is a useable raw material for building materials. The values of zinc and lead - which are critical for environmental friendly use - are reduced to concentrations below 1% of zinc and 0.1 % of lead. The iron is mainly reduced to FeO and in parts to metallic iron (i.e 10% of total Fe) in this process. But under the prevailing conditions accretions are not expected.
Steel-slag as filler material in concrete
Stahlwerksschlacke als Zuschlagsstoff für die Betonherstellung
Moosberg-Bustnes, H. (author)
2004
7 Seiten, 7 Bilder, 6 Tabellen, 9 Quellen
Conference paper
English
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