Elsevier

Waste Management

Volume 135, November 2021, Pages 158-166
Waste Management

Synergetic valorization of basic oxygen furnace slag and stone coal: Metal recovery and preparation of glass-ceramics

https://doi.org/10.1016/j.wasman.2021.08.044Get rights and content
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Highlights

  • Synergetic valorization of basic oxygen furnace slag and stone coal was achieved.

  • Fe-Mn-P-V-C alloys were recovered.

  • The mechanism for reduction was revealed.

  • Glass-ceramic was prepared from the final slag with bending strength of 96 MPa.

Abstract

A synergetic valorization method was proposed to convert the basic oxygen furnace (BOF) slag and stone coal into ferroalloy and glass-ceramic in this work. Effects of reduction time, temperature, and the mass ratio of BOF slag to stone coal on the reduction were studied. The reduction mechanism was investigated by in-situ observation and dissolution experiments. The effect of sintering temperature on the properties of glass-ceramics prepared from the final slag was further studied. The in-situ observation results indicate that the reduction reactions occurred mainly in the temperature range of 1673–1793 K. The reduction ratio of oxides and size of metal droplets can be improved by increasing reduction time, temperature, and decreasing stone coal addition. The recovered ferroalloys consisted of Fe, Mn, P, and V, which has the potential of returning to the steelmaking process or extracting vanadium. The modified final slag was suitable material for preparing glass-ceramic. Wollastonite-based glass-ceramic with a maximum bending strength of 95.83 MPa was prepared, which could be applied as abrasion-resistant and building decoration materials. Therefore, the present technological route can convert two kinds of industrial solid waste into two kinds of cleaner products and achieve the target of “zero waste”.

Keywords

Basic oxygen furnace slag
Stone coal
Metal recovery
Glass-ceramic
Synergetic valorization

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