Distribution Characteristics of Valuable Elements, Al, Li, and Ga, and Rare Earth Elements in Feed Coal, Fly Ash, and Bottom Ash from a 300 MW Circulating Fluidized Bed Boiler

Zhibin Ma, Xueyuan Shan, Fangqin Cheng

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Feed coal, fly ash (FA), and bottom ash (BA) were collected from a 300 MW circulating fluidized bed boiler. A mechanical screen classifier was used to separate and obtain particles with different sizes. The distribution of valuable elements, including aluminum (Al), lithium (Li), and gallium (Ga), and rare earth elements (REE) in the samples was investigated. Results indicate that the contents of SiO 2 and Al 2 O 3 in sized ash particles decreased as the particle size decreased; meanwhile, the contents of CaO, SO 3 , and Fe 2 O 3 apparently increased. The sulfur-fixing product anhydrite tended to be distributed in the fine ash particles. The valuable elements were more enriched in FA than in BA. The Li, Ga, and REE were evenly distributed in FA particles with different sizes. Separating ash particles with a superhigh concentration of these rare elements was difficult using the mechanical screen, but a part of the anhydrite or CaO in circulating fluidized bed ash could be removed easily. The Li and REE in the feed coal were highly associated with quartz, kaolinite, and other fractions containing SiO 2 and Al 2 O 3 . No definitive relationship between the Ga concentration and Al 2 O 3 content in the feed coal and ash samples was observed.

    Original languageEnglish
    Pages (from-to)6854-6863
    Number of pages10
    JournalACS Omega
    Volume4
    Issue number4
    DOIs
    Publication statusPublished - 16 Apr 2019

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    Ashes
    Coal Ash
    Gallium
    Coal
    Rare earth elements
    Aluminum
    Fly ash
    Lithium
    Fluidized beds
    Coal ash
    Boilers
    Kaolinite
    Kaolin
    Quartz
    Classifiers
    Sulfur
    Particle size

    Cite this

    @article{3b22c0fc5a2e4f68b70c88eecd779901,
    title = "Distribution Characteristics of Valuable Elements, Al, Li, and Ga, and Rare Earth Elements in Feed Coal, Fly Ash, and Bottom Ash from a 300 MW Circulating Fluidized Bed Boiler",
    abstract = "Feed coal, fly ash (FA), and bottom ash (BA) were collected from a 300 MW circulating fluidized bed boiler. A mechanical screen classifier was used to separate and obtain particles with different sizes. The distribution of valuable elements, including aluminum (Al), lithium (Li), and gallium (Ga), and rare earth elements (REE) in the samples was investigated. Results indicate that the contents of SiO 2 and Al 2 O 3 in sized ash particles decreased as the particle size decreased; meanwhile, the contents of CaO, SO 3 , and Fe 2 O 3 apparently increased. The sulfur-fixing product anhydrite tended to be distributed in the fine ash particles. The valuable elements were more enriched in FA than in BA. The Li, Ga, and REE were evenly distributed in FA particles with different sizes. Separating ash particles with a superhigh concentration of these rare elements was difficult using the mechanical screen, but a part of the anhydrite or CaO in circulating fluidized bed ash could be removed easily. The Li and REE in the feed coal were highly associated with quartz, kaolinite, and other fractions containing SiO 2 and Al 2 O 3 . No definitive relationship between the Ga concentration and Al 2 O 3 content in the feed coal and ash samples was observed.",
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    Distribution Characteristics of Valuable Elements, Al, Li, and Ga, and Rare Earth Elements in Feed Coal, Fly Ash, and Bottom Ash from a 300 MW Circulating Fluidized Bed Boiler. / Ma, Zhibin; Shan, Xueyuan; Cheng, Fangqin.

    In: ACS Omega, Vol. 4, No. 4, 16.04.2019, p. 6854-6863.

    Research output: Contribution to journalArticle

    TY - JOUR

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    AU - Ma, Zhibin

    AU - Shan, Xueyuan

    AU - Cheng, Fangqin

    PY - 2019/4/16

    Y1 - 2019/4/16

    N2 - Feed coal, fly ash (FA), and bottom ash (BA) were collected from a 300 MW circulating fluidized bed boiler. A mechanical screen classifier was used to separate and obtain particles with different sizes. The distribution of valuable elements, including aluminum (Al), lithium (Li), and gallium (Ga), and rare earth elements (REE) in the samples was investigated. Results indicate that the contents of SiO 2 and Al 2 O 3 in sized ash particles decreased as the particle size decreased; meanwhile, the contents of CaO, SO 3 , and Fe 2 O 3 apparently increased. The sulfur-fixing product anhydrite tended to be distributed in the fine ash particles. The valuable elements were more enriched in FA than in BA. The Li, Ga, and REE were evenly distributed in FA particles with different sizes. Separating ash particles with a superhigh concentration of these rare elements was difficult using the mechanical screen, but a part of the anhydrite or CaO in circulating fluidized bed ash could be removed easily. The Li and REE in the feed coal were highly associated with quartz, kaolinite, and other fractions containing SiO 2 and Al 2 O 3 . No definitive relationship between the Ga concentration and Al 2 O 3 content in the feed coal and ash samples was observed.

    AB - Feed coal, fly ash (FA), and bottom ash (BA) were collected from a 300 MW circulating fluidized bed boiler. A mechanical screen classifier was used to separate and obtain particles with different sizes. The distribution of valuable elements, including aluminum (Al), lithium (Li), and gallium (Ga), and rare earth elements (REE) in the samples was investigated. Results indicate that the contents of SiO 2 and Al 2 O 3 in sized ash particles decreased as the particle size decreased; meanwhile, the contents of CaO, SO 3 , and Fe 2 O 3 apparently increased. The sulfur-fixing product anhydrite tended to be distributed in the fine ash particles. The valuable elements were more enriched in FA than in BA. The Li, Ga, and REE were evenly distributed in FA particles with different sizes. Separating ash particles with a superhigh concentration of these rare elements was difficult using the mechanical screen, but a part of the anhydrite or CaO in circulating fluidized bed ash could be removed easily. The Li and REE in the feed coal were highly associated with quartz, kaolinite, and other fractions containing SiO 2 and Al 2 O 3 . No definitive relationship between the Ga concentration and Al 2 O 3 content in the feed coal and ash samples was observed.

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