Correlation between mercury content and leaching characteristics in waste phosphor powder from spent UV curing lamp after thermal treatment

Seung Ki Back, Bup Mook Joung, Eun Song Lee, Jin Ho Sung, A. H.M. Mojammal, Yong Joon Park, Yongchil Seo

Research output: Contribution to journalArticle

Abstract

This study evaluated the correlation between the amount of mercury (Hg) compounds in waste phosphor powder from spent UV curing lamps and their leaching characteristics. The appropriate thermal treatment conditions and Hg content in the residue necessary to satisfy the leaching criteria for classification as non-hazardous waste were identified. The decomposition of Hg compounds by thermal treatment was also evaluated by comparing sequential extraction results based on thermal stability and leaching potential of Hg compounds. Before the thermal treatment, the Hg content in waste phosphor powder and concentration in the leaching extract were 108.7 mg-Hg/kg and 0.56 mg-Hg/L, respectively. Hg compounds with low thermal stability were removed rapidly during the initial stage of thermal treatment at temperatures between 400 °C and 600 °C. After thermal treatment, Hg in the form of an intermetallic compound, such as Sr-Hg, was expected to be remained mainly, and the Hg content was reduced to 13 mg-Hg/kg in the waste phosphor powder, at that point the residue satisfied the leaching standard limit (5 μg-Hg/L) for non-hazardous waste stipulated in the legislation of Republic of Korea.

Original languageEnglish
Article number121094
JournalJournal of Hazardous Materials
Volume382
DOIs
Publication statusPublished - 2020 Jan 15

Fingerprint

Mercury
Electric lamps
Phosphors
Powders
Leaching
Curing
Hot Temperature
Heat treatment
leaching
Thermodynamic stability
Mercury compounds
Mercury Compounds
Intermetallics
Republic of Korea
legislation
lamp
thermal treatment
mercury
Legislation
decomposition

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Back, Seung Ki ; Joung, Bup Mook ; Lee, Eun Song ; Sung, Jin Ho ; Mojammal, A. H.M. ; Park, Yong Joon ; Seo, Yongchil. / Correlation between mercury content and leaching characteristics in waste phosphor powder from spent UV curing lamp after thermal treatment. In: Journal of Hazardous Materials. 2020 ; Vol. 382.
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Correlation between mercury content and leaching characteristics in waste phosphor powder from spent UV curing lamp after thermal treatment. / Back, Seung Ki; Joung, Bup Mook; Lee, Eun Song; Sung, Jin Ho; Mojammal, A. H.M.; Park, Yong Joon; Seo, Yongchil.

In: Journal of Hazardous Materials, Vol. 382, 121094, 15.01.2020.

Research output: Contribution to journalArticle

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