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Acid leaching of ash from wood, asphaltite and lignite combustion: trace element occurences
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
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2004 (English)In: American Chemical Society, 228th National Meeting, Washington, DC: American Chemical Society (ACS), 2004Conference paper, Meeting abstract (Other academic)
Abstract [en]

The leaching of ash in sulfuric acid (pH 1.0, 25EC, S/L 1:10) was studied as a function of time. Data for the extraction of trace elements are presented. The study embraced ash from the combustion of two Turkish lignites (Yata?an and Tunçbilek), one asphaltite (Silopi) and the briquettes of Swedish softwood sawmill residues (Fränsta). Conclusions are drawn regarding suitable residence times for an industrial washing process as well as the chemical nature of trace elements in the untreated ashes. The kinetics of trace element (Cd, Co, Cr, Cu, Mo, Ni, V and Zn) dissolution followed a shrinking core model and extended times (> 32 h) were required to reach maximum extraction from the ashes. Comparisons with data for the dissolution of dominant ions point at association with aluminum or iron containing phases (clays). Th and U reached high extraction yields after 8 h in solution, which suggests either surface association or association with rapidly dissolved Ca or Mg containing phases. Time-dependent Ba and Pb dissolution was observed below the limit set by the solubility of the corresponding sulfides.

Place, publisher, year, edition, pages
Washington, DC: American Chemical Society (ACS), 2004.
Series
Abstracts of Papers of the American Chemical Society, ISSN 0065-7727
National Category
Metallurgy and Metallic Materials Other Physics Topics
Research subject
Process Metallurgy; Fysik
Identifiers
URN: urn:nbn:se:ltu:diva-32576Local ID: 71cf0c10-8c48-11db-8975-000ea68e967bOAI: oai:DiVA.org:ltu-32576DiVA, id: diva2:1005810
Conference
American Chemical Society National Meeting : 22/08/2004 - 26/08/2004
Note
Godkänd; 2004; 20061212 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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http://oasys2.confex.com/acs/228nm/techprogram/P788543.HTM

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Sandström, ÅkePaul, Jan

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