SPECIATION OF IRON, ZINC, LEAD AND CALCIUM IN BLAST FURNACE TOP-GAS FILTER DUST BY SEQUENTIAL LEACHING

1 LANZERSTORFER Christof
Institution:
1 University of Applied Sciences Upper Austria, Wels, Austria, EU, c.lanzerstorfer@fh-wels.at
Conference:
30th Anniversary International Conference on Metallurgy and Materials, Brno, Czech Republic, EU, May 26 - 28, 2021
Proceedings:
Proceedings 30th Anniversary International Conference on Metallurgy and Materials
Pages:
95-100
ISBN:
978-80-87294-99-4
ISSN:
2694-9296
Published:
15th September 2021
Proceedings of the conference have been sent to Web of Science and Scopus for evaluation and potential indexing.
Metrics:
27 views / 13 downloads
Abstract

Top-gas dedusting at blast furnaces (BF) is usually done with venturi scrubbers. However, in recent years, the total dry dedusting of BF top-gas has become a common technology. In this case, a fabric filter is used instead of the venturi scrubber. For recycling, the dry dust from a fabric filter is preferable to the sludge from a scrubber. The main constituents of BF dedusting residues, Fe, C and Ca are of some value, while tramp elements, particularly Zn, can cause problems in the process. Results from leaching of the sludge obtained in wet BF dedusting are available. In contrast, data from leaching of dry filter dust from BF dedusting are not available. However, it has to be assumed that the behavior of a dust from dry dedusting deviates somewhat from that of a sludge due to the prolonged residence time of the sludge in the scrubber system under varying pH. In this study the filter dust of a BF top-gas dry dedusting filter was investigated, applying sequential leaching and X-ray diffraction analysis for the investigation of the distribution of Fe, Ca, Zn and Pb in various compounds with a focus on the tramp element Zn.

Keywords: Blast furnace, filter dust, zinc, leaching

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