Browsing by Author "Bold Khosbayar"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Investigation of rare earth elements (REEs) from coal and coal byproducts
    (German Mongolian Institute for Resouce and Technology, 2023-05-14) Bold Khosbayar; Bayardulam Jamiyansuren; Battsengel Baatar
    The use of coal fly ash (CFA) as a potential secondary source of rare earth elements (REEs) has gained attention of researchers recently due to its high REEs content. The aim of thesis is to investigate conventional physical separation methods, such as particle size analysis, magnetic separation and froth flotation, for the recovery of REEs from fly ash obtained from a commercial coal-powered plant. The amount of rare earth elements (REEs) present in the sample of coal fly ash was measured using a technique called inductively coupled plasma optical emission spectroscopy (ICP-OES). The findings of the quantitative analysis revealed that the total content of REEs in the coal ash was 416.7 parts per million (ppm).Experimental results showed that flotation was effective in improving the recovery and upgrading of REEs depending on the pH condition of the pulp. The highest REEs recovery 71.72% was achieved at pH 12, while the best grade upgrade 456.44 ppm was achieved at pH 10. However, magnetic separation tests showed that most REEs ended up in the tailings. The performance of various beneficiation methods varied significantly in this study. Overall, it was concluded that physical separation methods could be used to recover REEs from coal fly ash before further processing through hydrometallurgical methods. These findings have important implications for the development of sustainable and costeffective processes for the extraction of REEs from alternative sources, such as coal fly ash.
  • Thumbnail Image
    Item
    Investigation of rare earth elements (REEs) from coal and coal byproducts
    (German Mongolian Institute for Resouce and Technology, 2023-05-14) Bold Khosbayar; Bayardulam Jamiyansuren; Battsengel Baatar
    The use of coal fly ash (CFA) as a potential secondary source of rare earth elements (REEs) has gained attention of researchers recently due to its high REEs content. The aim of thesis is to investigate conventional physical separation methods, such as particle size analysis, magnetic separation and froth flotation, for the recovery of REEs from fly ash obtained from a commercial coal-powered plant. The amount of rare earth elements (REEs) present in the sample of coal fly ash was measured using a technique called inductively coupled plasma optical emission spectroscopy (ICP-OES). The findings of the quantitative analysis revealed that the total content of REEs in the coal ash was 416.7 parts per million (ppm). Experimental results showed that flotation was effective in improving the recovery and upgrading of REEs depending on the pH condition of the pulp. The highest REEs recovery 71.72% was achieved at pH 12, while the best grade upgrade 456.44 ppm was achieved at pH 10. However, magnetic separation tests showed that most REEs ended up in the tailings. The performance of various beneficiation methods varied significantly in this study. Overall, it was concluded that physical separation methods could be used to recover REEs from coal fly ash before further processing through hydrometallurgical methods. These findings have important implications for the development of sustainable and cost-effective processes for the extraction of REEs from alternative sources, such as coal fly ash.
  • No Thumbnail Available
    Item
    Investigation of rare earth elements from coal and coal byproducts
    (2023) Bayardulam Jamiyansuren; Azjargal Burneebaatar; Battsengel Baatar; Bold Khosbayar
    Rare earth elements (REE) are considered critical raw materials essential for numerous clean technologies. As the discrepancy, their supply and demand increase globally. It is conceivable to recover REEs from secondary sources in order to close the gap. The coal, fly ash, and bottom ashes are collected from Baganuur Mining, Thermal Power Plant IV, and Baganuur Thermal Plant, respectively. The TESCAN Integrated Mineral Analyzer (TIMA) and X-ray diffractometer (XRD) were used to characterize the mineralogy of coal, fly ash, and bottom ashes and further investigation of REE associations and its mineral. It was demonstrated that rare earth minerals still exist in coal fly ash and are associated with metal oxides. The quantity of REEs in the coal sample was determined by using the inductively coupled plasm-mass spectrometry (ICP-MS) technique. The quantitative analysis result shows that the total REEs content in the coal ash was 414 parts per million (ppm). It was revealed that REEs are concentrated in fine non-magnetic particle size, and the froth flotation process is most effective at a pH=10. Using the physical separation method, the REEs in the coal fly ash was slightly enriched from 414 to 456.44 ppm. Thus, hydrometallurgical leaching is advised to evaluate the possibility of REEs recovery from secondary sources.