A novel method for Fe-Al2O3 composites prepared from high sulfur Bayan Obo iron concentrate: Effectively eliminate the emission of SO2

Yuxin Chen; Saiyu Liu; Shunli Ouyang; Yu Shi; Baowei Li

doi:10.1016/j.jhazmat.2019.121878

A novel method for Fe-Al₂O₃ composites prepared from high sulfur Bayan Obo iron concentrate: Effectively eliminate the emission of SO₂

J Hazard Mater. 2020 May 5:389:121878. doi: 10.1016/j.jhazmat.2019.121878. Epub 2019 Dec 18.

Authors

Yuxin Chen¹, Saiyu Liu², Shunli Ouyang³, Yu Shi¹, Baowei Li⁴

Affiliations

¹ Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China; School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China.
² School of Science, Inner Mongolia University of Science and Technology, Baotou 014010, China.
³ Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China.
⁴ Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China. Electronic address: [email protected].

PMID: 31882340
DOI: 10.1016/j.jhazmat.2019.121878

Abstract

Fe-Al₂O₃ composites with different carbon contents were prepared by reactive sintering from high sulfur iron concentrate, bauxite, Al₂O₃ powder mixture. The effects of different carbon contents on emission form of sulfur were studied. The thermo gravimetric-infrared radiation results showed there were no gaseous compounds containing sulfur discharged during the sintering except CO₂ and H₂O. It is indicated that sulfur precipitates around the metal phase in the form of sulfide by the phases and microstructures analysis. And with an increase in carbon contents, sulfide gradually transformed from FeS to MnS. The mechanical properties and acid resistance of materials can be improved by MnS rather than FeS. Samples with higher carbon content had optimal physical and chemical properties with bending strength of 295 MPa, hardness of 13.0 GPa, acid resistance of 94.89 % and alkali-resistance of 98.45 %. This study provides a novel cleaner method for the high sulfur iron concentrate that avoids the emission of sulfur-containing substances while ensuring the performance of the composite.

Keywords: Clean technology; Emission reduction; Iron concentrate; sulfur dioxide.

Publication types

Research Support, Non-U.S. Gov't