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Process selection for recycling dusts and sludges at China steel
RISE, Swerea, Swerea MEFOS.
2010 (English)In: SEAISI Quarterly (South East Asia Iron and Steel Institute), ISSN 1295721, Vol. 39, no 1, p. 54-60Article in journal (Refereed)
Abstract [en]

In integrated steel works, dusts and sludges (commonly called residual materials) are inevitably generated with steel production. At China Steel Corporation (CSC), most of these residual materials were recycled as the raw materials of sintering plant to produce sinter. In order to reduce dioxins emission of sintering machines, CSC decided to remove the oily and chlorine-containing residual materials (9 kinds, approximately 0.22 million dry ton per year) away from the sinter mix and search other routes instead to recycle these residual materials in plant. Due to high iron oxides and carbon contents of the residual materials, the carbothermic reduction technology was recognized as the best achievable technologies (BAT) in CSC's survey work. Through studies on technology feasibility, equipment suitability, product quality, pollutants emission and operation cost, the combined process of one RHF (Rotary Hearth Furnace) process and one CBP (Cold-Bonded Pelletization) process was considered as the best solution to reach the goals of high efficient operation, high valorization, no secondary wastes and minimum pollutants emission. Products of the RHF process and CBP process are DRI (Direct Reduced Iron) and CBP (Cold-Bonded Pellets), respectively. At CSC, these products are charged into blast furnace to produce hot metal. The by-product of RHF process is the crude zinc oxide powder which is sold to zinc refinery. The combined process in CSC was constructed from January 2007, commissioned at the beginning of 2008, and reached the expected performance at the end of 2008.

Place, publisher, year, edition, pages
2010. Vol. 39, no 1, p. 54-60
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12683Scopus ID: 2-s2.0-84879874964OAI: oai:DiVA.org:ri-12683DiVA, id: diva2:972875
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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