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Open AccessArticle

Oxidative Leaching of Zinc and Alkalis from Iron Blast Furnace Sludge

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Facultad de Metalurgia, Universidad Autónoma de Coahuila, Carretera 57 Km 5, C.P. 25710 Monclova, Coahuila, Mexico
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Escuela Superior de Ingenieria, Universidad Autónoma de Coahuila, Blvd. Adolfo López Mateos s/n C.P. 26800 Nueva Rosita, Coahuila, Mexico
*
Author to whom correspondence should be addressed.
Metals 2019, 9(9), 1015; https://doi.org/10.3390/met9091015
Received: 20 August 2019 / Revised: 3 September 2019 / Accepted: 5 September 2019 / Published: 18 September 2019
(This article belongs to the Special Issue Advances in Mineral Processing and Hydrometallurgy)
The sludge from a wet-off gas cleaning system of the iron blast furnace (BF) contains significant amounts of iron; however, they cannot be recycled due to their high content of zinc and alkalis. These compounds are detrimental to the optimal performance of iron and steelmaking furnaces. In this work, a comparative laboratory study to reduce zinc and alkali contained in the blast furnace sludge (BFS) is presented. The effect of leaching parameters such as oxidant (i.e., ferric ion, oxygen or ozone), aqueous solution media (i.e., 0.2 M NH4Cl, 0.2 M HCl and 0.1 M H2SO4) and temperature (i.e., 27 and 80 °C) on Zn and alkalis (Na2O and K2O) removal were studied by applying an experimental design. The results obtained show that Zn and K2O removal of 85% and 75% were achieved under the following conditions: Ozone as an oxidant agent and 0.1 M H2SO4 as an aqueous medium, temperature had no significant effect. The results are supported by thermodynamic diagrams and the possible chemical reactions are mentioned. Although the results also indicate that leaching under the above conditions dissolves up to 9% of iron, this loss is much less than leaching without the oxidizing conditions generated by the ozone. The BFS obtained from this treatment could be recirculated to the iron or steelmaking processes to recover iron values. View Full-Text
Keywords: iron and steelmaking wastes; zinc; alkalis; aqueous treatment iron and steelmaking wastes; zinc; alkalis; aqueous treatment
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Soria-Aguilar, M.J.; Davila-Pulido, G.I.; Carrillo-Pedroza, F.R.; Gonzalez-Ibarra, A.A.; Picazo-Rodriguez, N.; Lopez-Saucedo, F.J.; Ramos-Cano, J. Oxidative Leaching of Zinc and Alkalis from Iron Blast Furnace Sludge. Metals 2019, 9, 1015.

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