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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
environmental science
Geochemistry of ultra-fine and nano-compounds in coal gasification ashes: A synoptic view
Science of the Total Environment, Volume 456-457, Year 2013
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Description
The nano-mineralogy, petrology, and chemistry of coal gasification products have not been studied as extensively as the products of the more widely used pulverized-coal combustion. The solid residues from the gasification of a low- to medium-sulfur, inertinite-rich, volatile A bituminous coal, and a high sulfur, vitrinite-rich, volatile C bituminous coal were investigated. Multifaceted chemical characterization by XRD, Raman spectroscopy, petrology, FE-SEM/EDS, and HR-TEM/SEAD/FFT/EDS provided an in-depth understanding of coal gasification ash-forming processes. The petrology of the residues generally reflected the rank and maceral composition of the feed coals, with the higher rank, high-inertinite coal having anisotropic carbons and inertinite in the residue, and the lower rank coal-derived residue containing isotropic carbons. The feed coal chemistry determines the mineralogy of the non-glass, non-carbon portions of the residues, with the proportions of CaCO3 versus Al2O3 determining the tendency towards the neoformation of anorthite versus mullite, respectively. Electron beam studies showed the presence of a number of potentially hazardous elements in nanoparticles. Some of the neoformed ultra-fine/nano-minerals found in the coal ashes are the same as those commonly associated with oxidation/transformation of sulfides and sulfates. © 2013 Elsevier B.V..
Authors & Co-Authors
Kronbauer, Marcio A.
Unknown Affiliation
Izquierdo, Maria
Unknown Affiliation
Dai, Shifeng
Unknown Affiliation
Waanders, F. B.
Unknown Affiliation
Wagner, Nicola Jane
Unknown Affiliation
Mastalerz, Maria
Unknown Affiliation
Hower, J. C.
Unknown Affiliation
Oliveira, Marcos L.S.
Unknown Affiliation
Taffarel, Silvio R.
Unknown Affiliation
Bizani, Delmar
Unknown Affiliation
Silva, Luis F.O.
Unknown Affiliation
Statistics
Citations: 92
Authors: 11
Affiliations: 10
Identifiers
Doi:
10.1016/j.scitotenv.2013.02.066
ISSN:
00489697
e-ISSN:
18791026
Research Areas
Environmental
Study Approach
Qualitative