Over the last years, waste heat recovery in steel industry attracted more and more attention. Environmental regulations, public funding as well as required revamps of old dedusting systems lead steel plant operators to discuss and to evaluate possibilities of recovering waste heat. The development of a waste heat recovery plant requires extensive knowledge as well as long experience of the entire plant, including water-steam cycle as well as EAF process, dedusting system and downstream waste heat consumers. Primetals provides innovative and reliable waste heat recovery solutions for EAF which are presented in this paper. An innovative waste heat recovery plant is introduced which was installed at Arvedi / Italy. Waste heat is used to produce steam for two pickling lines, which are in a large distance to the EAF. The substitution of the existing gas fired boilers lead to a decisive reduction of operating costs of the steel plant. A heat recovery plant was installed at steel plant Höganäs / Sweden, whereas hot water at high pressure is produced and utilized for the local district heating system. The paper demonstrates economic opportunities for efficient waste heat recovery in EAF based steel plants and reasonable integration of the waste heat recovery system into the dedusting line.
One of the global trends that are constantly challenging the iron and steel industry is related to the generation of fines, slurry, sludge and scales, summed up as ferrous by-products. The recycling of those by-products is commonly practiced in many steel plants. These materials normally cannot be used directly in the primary processes. The most common application is to add ferrous by-products which are suitable concerning chemical composition and grain size distribution to the sinter mix. Besides addition of fines to the sinter plant, other solutions exist. Primetals will present latest developments in the field of cold briquetting of ferrous by-products. Giving examples and results of executed project(s) of cold briquettes directly fed to the DR shaft, and other solutions for integrated steel mills. Coal briquetting on the other hand is based on coal fines which often originate from wear during coal transport from mine to plant. These fines can be used to produced briquettes designed either for the use in a smelting reduction process (COREX®/FINEX®) or for enhanced coke oven operation in the traditional blast furnace route. Primetals coal briquetting targets at the production of coal briquettes superior in mechanical properties and hot strength. Their application aims at an increase in productivity and reduction of costs. In the paper, Primetals will show different scenarios and solutions for coal briquetting technology.
Government regulations around the world concerning environmental care are becoming more stringent, also including regulations and restrictions of depositing and use of dust, sludge and slag generated in the iron and steelmaking process. With this scenario, by-products such as iron containing dust, sludge, oxide fines, mill scales and slag, become a valuable resource and recycling may be a profitable activity within a plant. Up to ten percent in mass of the total steel output of dust, sludge and mill scale by-product materials and more than 40% of slag by product are generated within an integrated steel plant with an iron content ranging from 50% to 65% for fines and up to 25% for BOF-slag. Slags are being widely recycled and used in the cement industry, as is the case for BF slag, and in the construction industry in the case of BOF slags and EAF slags. However, value of BOF unmodified slag is typically low and environmental regulations limit the usage of the unmodified BOF slag. This paper describes innovative solutions for recycling of fines using cold briquetting technology and the modification and granulation of slag from steelmaking that increase the value of the by-product and yield a marketable product.
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