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The aim of this project was to adapt and optimise laser-based sensing (LIBS) in plant processing conditions, to develop a quick online, in-situ, integrated inference system for process-critical components of molten slag. The operative parameters of slag processing, needed or being useful for taking correction measures and for intervention online, as oxidation potential, basicity, recycling capacity, etc. should be determined through integrating sensing to ensure representivity of measurements and transferability of results. The main objectives of the project were: - adaptation of LIBS to EAF, converter and ladle conditions; - detection of Fe, Ca, Si, Al, Mg, Cr and Mn in slags by LIBS; - quick determination of oxidation potential, of slag foaming and of basicity of the slags; - proof of the online feasibility of the quick detection system; - application of Inquisss to support slag recycling measures by online detection of its recycling capacity. All the above conditions were reached. In addition to the above objectives, the following objectives and problems arose and were solved during the research work: - viscosity influence on laser measurements;- slag inhomogeneity and the influence on laser measurements, especially on the intensity; - focus problems, overcome by the development of a special graphite nozzle for levelling the slag during measurements and use of a technique to enable auto-focusing of the laser beam to the surface of the slag, which is absolutely necessary for the future industrial applications.

Additional information

Authors: SENK D, RWTH, Aachen (DE);WIENS O, RWTH, Aachen (DE);MAVROMMATIS K, RWTH, Aachen (DE);SANCHO L F, Aceralia, Avilés (ES);RIVAS O, Acerinox, Los Barrios (ES);ANDROUTSOPOULOS N, Helliniki Halyvourdia, Athens (GR);GALVAO C, ISQ, Porto Salvo (PT);LASNERNA J J, University of Malaga, Malaga (ES);PAPAMANTELLOS D, University of Patras, Patras (GR);PALANGAS C, University of Patras, Patras (GR);ANGELOPOULOS G, University of Patras, Patras (GR)
Bibliographic Reference: EUR 22818 EN (2007), 156 pp. Euro: 25
Availability: Katalogue Number: KI-NA-22818-EN-S The paper version can be ordered online and the PDF version downloaded at:
ISBN: ISBN: 978-92-79-05361-0
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