Effect of coal blending on the leaching characteristics of arsenic and selenium in fly ash from fluidized bed coal combustion

Facun Jiao, Lian Zhang, Naoomi Yamada, Atsushi Sato, Yoshihiko Ninomiya

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

The capture ability of fly ash to arsenic (As) and selenium (Se) was investigated through the combustion of two single bituminous coals A and B and their mixture (blending ratio of 1:1, wt/wt) in a lab-scale fluidized bed reactor. The leaching characteristics of As and Se in corresponding fly ash were also conducted according to Japanese Industrial Standard (JIS). Speciation of As and Se during fly ash leaching test were predicted from the perspective of thermodynamic equilibrium. The results indicate that, combustion of coal B, containing abundant calcium, possesses a higher capture ability of As and Se than that of coal A through possible chemical reaction between As/Se with CaO. Leaching behavior of As and Se from fly ash is strongly dependent on the pH of the leachate. Free calcium in fly ash generates an alkaline leachate during leaching test and subsequently reduces As and Se leaching, which cause the leaching ratio of As and Se in fly ash derived from the combustion of coal B was much lower, relative to that in coal A. Combustion of blending coal promotes the overall capture ability of the fly ash to As/Se and reduces their leaching from fly ash through the synergy of free CaO between this two kind of fly ash.

Original languageEnglish
Title of host publicationCleaner Combustion and Sustainable World - Proceedings of the 7th International Symposium on Coal Combustion
EditorsHaiying Qi, Bo Zhao
Place of PublicationChina
PublisherTsinghua University Press
Chapter10
Pages569 - 577
Number of pages9
VolumeXIX
ISBN (Print)3540356061, 9783642304446
DOIs
Publication statusPublished - 2013
EventInternational Symposium on Coal Combustion (ISCC 2011) - Harbin, China
Duration: 17 Jul 201120 Jul 2011
Conference number: 7th
https://www.vdi.de/uploads/media/1st_Announcement_of_7th_ISCC-China_e.pdf (Call for papers)

Publication series

NameCleaner Combustion and Sustainable World - Proceedings of the 7th International Symposium on Coal Combustion

Conference

ConferenceInternational Symposium on Coal Combustion (ISCC 2011)
Abbreviated titleISCC 2011
CountryChina
CityHarbin
Period17/07/1120/07/11
Internet address

Keywords

  • Arsenic
  • Coal blending
  • Fluidized bed
  • Leaching behavior
  • Selenium

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