Yttrium partitioning and associations in coal-combustion ashes prior to and after their leaching in HCl

Yttrium associations and partitioning within fluidised-bed coal combustion ashes were studied in particle-size fractions prior to and after their leaching in cold dilute HCl. In original ash fractions (not leached in HCl), the dominant association of Y to P2O5 and TiO2 was revealed while after the l...

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Bibliographic Details
Published in:Fuel processing technology 2018-05, Vol.173, p.205-215
Main Authors: Bartonová, Lucie, Serencíšová, Jana, Cech, Bohumír
Format: Article
Language:English
Subjects:
Ashes
Coal combustion
Combustion
Dilution
Fluidised bed
Fluidized bed combustion
HCl extraction
Leaching
Partitioning
Phosphates
Phosphorus pentoxide
Titanium dioxide
Yttrium
Yttrium associations
Yttrium oxide
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Summary:Yttrium associations and partitioning within fluidised-bed coal combustion ashes were studied in particle-size fractions prior to and after their leaching in cold dilute HCl. In original ash fractions (not leached in HCl), the dominant association of Y to P2O5 and TiO2 was revealed while after the leaching, the strength of relationship to P2O5 decreased considerably and TiO2 exhibited the only significant correlation. Overall HCl-extraction percentage of Y from these ashes was ca. 50% with TiO2-associated Y predominantly contributing to insoluble fraction. Yttrium percentage dissolved in HCl can be attributed to its affinity to soluble phosphates (e.g., fluor/hydroxy apatites) or its potential occurrence in the form of Y2O3 or YCl3. •Yttrium partitioning within fluidised-bed coal combustion ashes were studied.•The highest correlation coefficients of Y were related to TiO2 and P2O5 concentrations.•About 50% of Y (and 85% of P) was dissolved from ashes by cold dilute HCl.•After leaching the ashes in HCl, the only significant correlation was to TiO2.
ISSN:0378-3820
1873-7188
DOI:10.1016/j.fuproc.2018.01.011