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Insight into the function of waste cooking oil in the magnetite reduction process

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  • Zhu, Yunfeng
  • Zhou, Shiwei
  • Wei, Yonggang
  • Li, Bo
  • Wang, Hua

Abstract

Using waste cooking oil (WCO) as a green reductant in the pyrometallurgical field can relieve environmental pressure, and the corresponding mechanism involved in the WCO reduction process should be clarified. Based on the cracking characteristics of oil, the mechanism of WCO in the reduction process was investigated by using pure magnetite (Fe3O4) as the reduction object. The reaction system of WCO–Fe3O4 under two different contact modes was analyzed. The results indicated that 700 μL WCO was completely cracked at 1200 °C within 2 min, and 84.1% Fe3O4 was reduced during this process. This result suggested that the reductions mainly occurred after oil cracking. Furthermore, the reducibility of carbon produced by cracking was weaker than that of conventional fossil-based carbon. Thus, WCO mainly provides reductants (H2, CO, C, etc.) for the reduction system and is difficult to directly use in reduction.

Suggested Citation

  • Zhu, Yunfeng & Zhou, Shiwei & Wei, Yonggang & Li, Bo & Wang, Hua, 2023. "Insight into the function of waste cooking oil in the magnetite reduction process," Renewable Energy, Elsevier, vol. 210(C), pages 188-195.
    • Handle: RePEc:eee:renene:v:210:y:2023:i:c:p:188-195
    DOI: 10.1016/j.renene.2023.04.068
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