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    Enhanced bioweathering of coal for rare earth element extraction and concentration

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    Author
    Sachan, Ankur
    Chair
    Ghosh, Tathagata
    Briggs, Brandon
    Committee
    Ganguli, Rajive
    Aggarwal, Srijan
    Keyword
    rare earth metals
    rare earths
    rare earth metal compounds
    coal mines
    mining
    Alaska
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/10536
    Abstract
    Rare earth elements (REEs) are a group of seventeen elements that include scandium, yttrium, and fifteen of the lanthanide series elements, which are used in a variety of consumer goods and for defense purposes. Acquiring a domestic profitable source of REEs is a critical national need as most of the global supply comes from one country, China. To counter this problem, the US is actively looking at alternative sources of REEs by implementing unconventional methods of extraction. Coal is one of the alternative sources of REEs. Alaskan coal from Wishbone Hill and Healy are known to contain REEs up to 286 ppm and 524 ppm, respectively, while having concentrations as high as 950 ppm on ash basis in some density fractions. Microbial leaching or bioleaching is a novel method that can be used for extraction of REEs from coal as microbes are known to affect earth's surface over geologic time by playing critical roles in weathering of minerals. A certain species of bacteria, Shewanella oneidensis MR-1, was used to separate the REEs from Wishbone Hill and Healy coal samples. The experiments were performed for various density fractions of both coals by varying solids percentage, temperature, size of coal, and bacterial concentration, and recovery of REEs for these conditions was recorded. Highest individual recovery of neodymium, 75.3%, was obtained for Wishbone Hill 1.3 floats, while a maximum of 98.4% total REE recovery was obtained for Healy 1.3 sinks. Healy coal has the higher total recovery of REEs in comparison to Wishbone Hill coal. Bioleaching process was also compared to the acid leaching process. Healy coal responded better to bioleaching than the acid leaching process. The Wishbone Hill coal had comparable recoveries of bioleaching with acid leaching, although they were always less than acid leaching.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2019
    Date
    2019-05
    Type
    Thesis
    Collections
    Engineering

    entitlement

     
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