ISSN 2594-5327
54º Congresso anual — Vol. 54 , num. 1 (1999)
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In the age of sustainable development, recycling of steelworks by-products such as dusts, sludge, and mill scale is worthwhile not only because of saving landfill space and costs for disposal of these materials. Furthermore, most of these materials contain high concentration of iron and/or fuel such as carbon, oil, or plastics which can be recovered or utilized with recycling. Materials high in sulfur and phosphorus should be limited because they impair the steel quality unless a separate treatment unit is in place downstream of the BOF. The BOF is especially suited for recycling because excess heat is generated which can be used for melting and reducing waste oxides. In this way, cooling is achieved and scrap and/or iron ore is saved to a large extent. In particular, the high iron-containing products like BOF dust and mill scales are most suitable for this purpose. If no repercussions on the primary aggregates are demanded or large amounts of by-products have to be processed, the RMF (Recycling Melting Furnace) is profitably used. The RMF shows high flexibility related to the raw material input and by-product rates up to 50% are economically feasible. The paper also evaluates the impacts of wet and dry de-dusting systems on the recycling of by-product. However, through recycling by-products, problems may occur with a zinc-enrichment in the system. Therefore to provide more or less waste-free steel works the CONTOP® process, a cyclone melting technology is presented.
In the age of sustainable development, recycling of steelworks by-products such as dusts, sludge, and mill scale is worthwhile not only because of saving landfill space and costs for disposal of these materials. Furthermore, most of these materials contain high concentration of iron and/or fuel such as carbon, oil, or plastics which can be recovered or utilized with recycling. Materials high in sulfur and phosphorus should be limited because they impair the steel quality unless a separate treatment unit is in place downstream of the BOF. The BOF is especially suited for recycling because excess heat is generated which can be used for melting and reducing waste oxides. In this way, cooling is achieved and scrap and/or iron ore is saved to a large extent. In particular, the high iron-containing products like BOF dust and mill scales are most suitable for this purpose. If no repercussions on the primary aggregates are demanded or large amounts of by-products have to be processed, the RMF (Recycling Melting Furnace) is profitably used. The RMF shows high flexibility related to the raw material input and by-product rates up to 50% are economically feasible. The paper also evaluates the impacts of wet and dry de-dusting systems on the recycling of by-product. However, through recycling by-products, problems may occur with a zinc-enrichment in the system. Therefore to provide more or less waste-free steel works the CONTOP® process, a cyclone melting technology is presented.
Palavras-chave
converting wastes into profit
converting wastes into profit
Como citar
Fleischanderl, Alexander; Jr., Paulo Marcos Braga; Gebert, Walter.
CONVERTING WASTES INTO PROFIT – RECYCLING OF HIGH VALUE SUBSTANCES FROM SOLID WASTES USING BOF, RMF AND CONTOP®-TECHNOLOGY,
p. 1450-1468.
In: 54º Congresso anual,
São Paulo, Brasil,
1999.
ISSN: 2594-5327, DOI 10.5151/2594-5327-C00680
