Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Today the steel producing process can be considered as to consist of three stages: the reduction stage in the blast furnace or as direct reduction process, the steel production stage in the BOF (LD)-process and in the electric arc furnace process, and the secondary steelmaking process. From these stages result blast furnace (BF) slag, basic oxygen steelmaking (BOS) slag and electric arc furnace (EAF) slag, and secondary metallurgy processes (SMP) slag. To assess the importance of the different slags and the products produced in 2000 the European Slag Association EUROSLAG made a questionnaire by European steelworks. The use of blast furnace and steel slags as raw material for the cement production, as aggregates for road and waterway constructions and as fertiliser demonstrates very impressive that they are world-wide accepted as approved materials. In 2000 the total blast furnace slag amounted to 25 million tons. About 29 % of this tonnage have been produced as air-cooled crystalline slag, 69 % as granulated and 2 % as pelletised slag. The utilisation rate is very high for blast furnace slags. Most European countries have an utilisation rate of 100 % or nearly 100 %. Only less than 2.7 % of the total amount is separately dumped to be processed later on. 55.9 % of the blast furnace slags are used as granulated slag mainly for the cement production. 39.5% are used as crystalline slag for road construction and other building purposes. Only a little quantity is used as fertiliser (0.3 %) and other purposes. Concerning steel slags the total amount was 16.8 million tons. About 59 % have been produced as BOS-slag, 28 % as EAF-slag and 13 % as SMP-slag. In opposite to the blast furnace slags about 24 % still have been dumped. These slags mostly are fine-grained and therefore not applicable for building purposes. Main fields of application are the construction industry (51 %), metallurgical recycling (14 %) and the production of fertiliser (4 %). The utilisation rate obtained until now underlines that slags are long-term approved products for varied fields of application. The slag industry will continue in using slags on a high level and in a manner which can be justified.
Today the steel producing process can be considered as to consist of three stages: the reduction stage in the blast furnace or as direct reduction process, the steel production stage in the BOF (LD)-process and in the electric arc furnace process, and the secondary steelmaking process. From these stages result blast furnace (BF) slag, basic oxygen steelmaking (BOS) slag and electric arc furnace (EAF) slag, and secondary metallurgy processes (SMP) slag. To assess the importance of the different slags and the products produced in 2000 the European Slag Association EUROSLAG made a questionnaire by European steelworks. The use of blast furnace and steel slags as raw material for the cement production, as aggregates for road and waterway constructions and as fertiliser demonstrates very impressive that they are world-wide accepted as approved materials. In 2000 the total blast furnace slag amounted to 25 million tons. About 29 % of this tonnage have been produced as air-cooled crystalline slag, 69 % as granulated and 2 % as pelletised slag. The utilisation rate is very high for blast furnace slags. Most European countries have an utilisation rate of 100 % or nearly 100 %. Only less than 2.7 % of the total amount is separately dumped to be processed later on. 55.9 % of the blast furnace slags are used as granulated slag mainly for the cement production. 39.5% are used as crystalline slag for road construction and other building purposes. Only a little quantity is used as fertiliser (0.3 %) and other purposes. Concerning steel slags the total amount was 16.8 million tons. About 59 % have been produced as BOS-slag, 28 % as EAF-slag and 13 % as SMP-slag. In opposite to the blast furnace slags about 24 % still have been dumped. These slags mostly are fine-grained and therefore not applicable for building purposes. Main fields of application are the construction industry (51 %), metallurgical recycling (14 %) and the production of fertiliser (4 %). The utilisation rate obtained until now underlines that slags are long-term approved products for varied fields of application. The slag industry will continue in using slags on a high level and in a manner which can be justified.
Production and use of air-cooled blastfurnace and steel slags
Herstellung und Verwendung von luftgekühlten Hochofen- und Stahlwerksschlacken
Motz, H. (Autor:in)
2003
14 Seiten, 8 Bilder, 2 Tabellen, 8 Quellen
Aufsatz (Konferenz)
Englisch
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