Dissolution behavior of selenium from coal fly ash particles for the development of an acid-washing process

Shunsuke Kashiwakura, Hajime Ohno, Yuichi Kumagai, Hiroshi Kubo, Kazuyo Matsubae, Tetsuya Nagasaka

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Coal fly ash emitted from coal-fired electric power stations generally contains environmentally regulated trace elements. In particular, boron, arsenic, and selenium have been recognized as troublesome trace elements because elutions from the fly ash contain them. In order to design an effective removal process for these trace elements, we have developed and investigated an acid-washing process. The dissolution behavior of selenium from coal fly ash particles was focused on for the improvement of the process, and was found to greatly depend on the pH of the acid solutions. The species of selenium in solutions with a pH of around 0-1 was determined to be H 2SeO 3. The dissolved H 2SeO 3 transformed into HSeO3- and adsorbed onto the surface of the ash particles in solution upon elevation of the pH. The re-elution of the absorbed HSeO3- as SeO32- at a pH of 10 was also confirmed, and will cause the elution of the excess selenium from the acid-washed ash.

Original languageEnglish
Pages (from-to)598-602
Number of pages5
JournalChemosphere
Volume85
Issue number4
DOIs
Publication statusPublished - 2011 Oct 1

Keywords

  • Acid washing
  • Coal fly ash
  • Dissolution mechanism
  • Selenium
  • Trace elements

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

Fingerprint Dive into the research topics of 'Dissolution behavior of selenium from coal fly ash particles for the development of an acid-washing process'. Together they form a unique fingerprint.

Cite this