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Critical elements are necessary for the transition to clean energy technologies. As the demand of the critical elements is increasing and limited availability of the critical elements due to geopolitical issues and low ore concentration, the world is eyeing for the secondary sources for the extraction of critical elements. However, coal fly ash is a promising alternative for the secondary sources, but it depends on the coal’s deposition environment and geochemical factors. So, geochemical studies for the critical elements are necessary to target which coal mine will suit best for the extraction of critical elements. This study investigates the distribution of trace and critical elements in the Dudhichua coal mining area from Singrauli coalfield by analyzing coal samples from five major blocks. The geochemical analysis, performed using X-ray fluorescence (XRF) and Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), quantifies major oxides alongside trace and critical elements. Total REY content was higher for NCL-II (150 ppm), followed by NCL-I (143 ppm), NCL-III (123 ppm), NCL-V (114 ppm) and NCL-IV (96 ppm). Among the NCL area, four coal sample from NCL-I, NCL-III, NCL-IV and NCL-V had outlook coefficient (Cout) more than 0.7. However, NCL-II samples had REY content more than 100 ppm but Cout was < 0.7. However, beneficiation studies could be done to increase its concentration and can be considered as a promising option. During fractionation in powerplant REEs generally tends to enrich in the coal fly ash which can make them economical for extraction. Most of the REEs are negatively correlated with the Fe2O3 and positively correlated with Al2O3 and SiO2 content in coal indicating its association with the clay minerals like kaolinite in coal. This shows the potential of Singrauli coals as a source of critical elements offering opportunities for resource recovery and diversification of the supply chain. This study highlights the significance of Singrauli coalfields in India as viable repositories for critical elements which could contribute to the nation's clean energy transition and global sustainability goals.

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Singrauli Coals as Strategic Repositories of Critical Elements for Energy Sustainability

  • 会议论文

  • 发表日期：

    2026年

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  • P. Gopinathan,
  • Amit Karmakar,
  • Kanishk Kumar Karan,
  • Bodhisatwa Hazra,
  • Om Prakash Kumar,
  • Pawan Kumar Gupta,
  • Prabal Boral,
  • P. K. Banerjee,
  • R. E. Masto

摘要

Critical elements are necessary for the transition to clean energy technologies. As the demand of the critical elements is increasing and limited availability of the critical elements due to geopolitical issues and low ore concentration, the world is eyeing for the secondary sources for the extraction of critical elements. However, coal fly ash is a promising alternative for the secondary sources, but it depends on the coal’s deposition environment and geochemical factors. So, geochemical studies for the critical elements are necessary to target which coal mine will suit best for the extraction of critical elements. This study investigates the distribution of trace and critical elements in the Dudhichua coal mining area from Singrauli coalfield by analyzing coal samples from five major blocks. The geochemical analysis, performed using X-ray fluorescence (XRF) and Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), quantifies major oxides alongside trace and critical elements. Total REY content was higher for NCL-II (150 ppm), followed by NCL-I (143 ppm), NCL-III (123 ppm), NCL-V (114 ppm) and NCL-IV (96 ppm). Among the NCL area, four coal sample from NCL-I, NCL-III, NCL-IV and NCL-V had outlook coefficient (Cout) more than 0.7. However, NCL-II samples had REY content more than 100 ppm but Cout was < 0.7. However, beneficiation studies could be done to increase its concentration and can be considered as a promising option. During fractionation in powerplant REEs generally tends to enrich in the coal fly ash which can make them economical for extraction. Most of the REEs are negatively correlated with the Fe2O3 and positively correlated with Al2O3 and SiO2 content in coal indicating its association with the clay minerals like kaolinite in coal. This shows the potential of Singrauli coals as a source of critical elements offering opportunities for resource recovery and diversification of the supply chain. This study highlights the significance of Singrauli coalfields in India as viable repositories for critical elements which could contribute to the nation's clean energy transition and global sustainability goals.