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  • Improved process control of hot metal production through a non-intrusive, online sensing system for metals in the topgas of the blast furnace (PROCSSYMO)


Alkalis, zinc and lead are well known for their negative impact on the blast furnace process on account of their low melting and vaporisation temperatures. As accompanying elements of the charged burden and coke, they affect its degradation behaviour and can lead to a higher coke consumption, accretions and scaffoldings. They are partly removed form the blast furnace via the slag and the topgas, whilst another part forms inner circuits and remains in the blast furnace. The removal of alkalis, zinc and lead can be improved by certain measures in blast furnace operation. For this reason the build-up of inner circuits has to be detected as early as possible.

Within the framework of this project, a laser measuring system based on LIBS (laser induced breakdown spectroscopy) was developed for detecting alkalis, zinc and lead. In onsite tests in three different blast furnaces in Europe, the feasibility and the industrial usefulness of this sensing system could be evaluated. For the first time the elements of the topgas dust were monitored online. The system enabled the continuous and simultaneous monitoring of Na, K, Zn, Pb, C, N, O, H, Ca and Fe. The average concentration of the circulating materials ranged between 2.46 and 18.40 x 10E-3 g/m{3}. Measuring periods of up to 10 hours a day with 10 measuring values per second were taken. The general good function of the system and first correlations of different elements with blast furnace parameterscould be clearly shown.

Additional information

Authors: MULHEIMS K, Thyssen Krupp Stahl AG, Duisburg (DE);BRINKMANN H, Thyssen Krupp Stahl AG, Duisburg (DE);SCHWALBE R, Thyssen Krupp Stahl AG, Duisburg (DE);HEINANEN K, Rautaruukki Oyj, Raahe (FI);MANNILA P, Rautaruukki Oyj, Raahe (FI);LUOTO P, Rautaruukki Oyj, Raahe (FI);SANCHO L, Aceralia, Aviles (ES);CARRASCAL D, Aceralia, Aviles (ES);COURIS S, IESL/FORTH, Heraklion (EL);NOLL R, Fraunhofer ILT, Aachen (DE);STURM V, Fraunhofer ILT, Aachen (DE);BRYSCH A, Fraunhofer ILT, Aachen (DE);GUDENAU H W, IEHK/RWTH, Aachen (DE);MAVROMMATIS K, IEHK/RWTH, Aachen (DE);OPFERMANN A, IEHK/RWTH, Aachen (DE)
Bibliographic Reference: EUR 21127 EN (2004), 179 pp. Euro: 25
Availability: EUR-OP reference: KI-NA-21127-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-7901-9
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