Processing of blast furnace collector dusts for their utilization in the steel industry

Authors

  • Iván Omar Acuña Gutiérrez Altos Hornos de México, S.A.B. de C. V., Prol. Benito Juárez S/N Las Lomas, 25770, Monclova, Coahuila, México. https://orcid.org/0000-0001-5992-9840
  • Damaris Margarita Puente Siller Altos Hornos de México, S.A.B. de C. V., Prol. Benito Juárez S/N Las Lomas, 25770, Monclova, Coahuila, México. https://orcid.org/0000-0001-5131-5190
  • José Manuel González de la Cruz Universidad Autónoma de Coahuila, Boulevard Venustiano Carranza, esquina González Lobo, S/N, República Oriente, 25280, Saltillo, Coahuila, México.
  • Luis Enrique Álvarez García Universidad Autónoma de Coahuila, Boulevard Venustiano Carranza, esquina González Lobo, S/N, República Oriente, 25280, Saltillo, Coahuila, México.
  • Juan Antonio López Corpus Altos Hornos de México, S.A.B. de C. V., Prol. Benito Juárez S/N Las Lomas, 25770, Monclova, Coahuila, México.
  • Alberto Perea Garduño Altos Hornos de México, S.A.B. de C. V., Prol. Benito Juárez S/N Las Lomas, 25770, Monclova, Coahuila, México.

DOI:

https://doi.org/10.37636/recit.v7n3e277

Keywords:

Blast furnace, Collector dusts, Leaching, Magnetic separation, Powder processing

Abstract

The production of pig iron involves the generation of by-products such as collector dusts, which are attractive due to their Fe content. However, they cannot be directly reused because of their high content of Zn and alkalis. Therefore, this research aims to explore their utilization through acid leaching. To achieve this, a sample was processed through grinding (1h) and low-intensity magnetic separation, and then the effect of hydrochloric acid as a leaching agent was evaluated at each stage of the process (0.10, 0.25, 0.50 and 1.0M HCl). Furthermore, the effect of temperature was analyzed for the system with 1M HCl. The results indicate that working with systems with high HCl concentration in both fresh and ground material made it possible to dissolve up to 65% Zn content in the initial sample (with 38.8% Fe). On the other hand, leaching the magnetically treated dusts achieved Zn solutions of 56% and 65% for 1 and 2 cleaning cycles, respectively. Regarding the Fe content, an increase was observed compared to the initial content, reaching from 53.8% to 59% Fe (making its processing feasible). Furthermore, as the temperature increased, the leaching of Zn was privileged, reaching up to 74% dissolution at 85°C. In the case of Na2O, P, and K2O dissolution, an increase in working temperature accelerated the dissolution kinetics. However, in the case of Fe, an increase in working temperature led to a decrease in its concentration. Lastly, thermodynamic analysis determined the ∆G° values of the reactions, indicating their spontaneity, i.e., they occur without the need of applied energy. In conclusion, it was possible to compare the effect of leaching systems at each stage of processing. At room temperature, leaching of the untreated dust achieved up to 65% Zn dissolution with 38.8% Fe, and after 2 rounds of magnetic cleaning, a dissolution of 65% Zn with a 61.4% Fe content is attained. By increasing the temperature, most of the reactions involved in the leaching process are catalyzed, especially the zinc dissolution (up to 74%). The feasibility of the involved reactions can be supported through thermodynamics.

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Effect of temperature on Zn leaching using 1M HCl solutions in double magnetic separation concentrate.

Published

2024-07-10

How to Cite

Acuña Gutiérrez, I. O., Puente Siller, D. M., González de la Cruz, J. M., Álvarez García, L. E., López Corpus, J. A., & Perea Garduño, A. (2024). Processing of blast furnace collector dusts for their utilization in the steel industry. REVISTA DE CIENCIAS TECNOLÓGICAS, 7(3), e277. https://doi.org/10.37636/recit.v7n3e277

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