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Sustainability Assessment of the Rare-Earth-Oxide Production Process and Comparison of Environmental Performance Improvements Based on Emergy Analysis

Author

Listed:
  • Jing An

    (School of Metallurgy, Liaoning Province Key Laboratory of Metallurgical Resources Recycling Science, Northeastern University, Shenyang 110819, China)

  • Aitian Tao

    (School of Metallurgy, Liaoning Province Key Laboratory of Metallurgical Resources Recycling Science, Northeastern University, Shenyang 110819, China)

  • He Yang

    (School of Metallurgy, Liaoning Province Key Laboratory of Metallurgical Resources Recycling Science, Northeastern University, Shenyang 110819, China)

  • Ang Tian

    (School of Metallurgy, Liaoning Province Key Laboratory of Metallurgical Resources Recycling Science, Northeastern University, Shenyang 110819, China)

Abstract

In recent years, the rapid development of the rare earth industry has had a serious impact on the environment. Some enterprises have taken measures to improve the production process. In order to explore the sustainability of this industry and these improvements’ environmental benefits, this paper combines emergy analysis and lifecycle assessment to evaluate and compare the production process of rare-earth oxides considering the three aspects of emergy flow, pollutant emissions, and emergy-based indicators. Changes in the emergy of pollutant emissions before and after improvement of the production process are discussed. The results show that the greatest inputs in the mining and beneficiation stage and smelting separation stage are labor force and service and non-renewable resources, respectively. These two production stages are highly dependent on external input and have weak competitiveness. Both stages place great pressure on the environment, so the bastnasite production process would be unsustainable in the long term. After the improvement, the environmental impact of the production process for bastnaesite changed significantly, indicating that the improvement effect of the wastewater treatment facilities and the change of fuel from coal to natural gas is remarkable.

Suggested Citation

  • Jing An & Aitian Tao & He Yang & Ang Tian, 2021. "Sustainability Assessment of the Rare-Earth-Oxide Production Process and Comparison of Environmental Performance Improvements Based on Emergy Analysis," Sustainability, MDPI, vol. 13(23), pages 1-16, November.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:23:p:13205-:d:690451
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    References listed on IDEAS

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