Mechanism of Vanadium Leaching during Surface Weathering
of Basic Oxygen Furnace Steel Slag Blocks: A Microfocus X-ray Absorption
Spectroscopy and Electron Microscopy Study
Version 2 2017-07-22, 13:29
Version 1 2017-07-06, 14:11
Posted on 2017-07-22 - 13:29
Basic
oxygen furnace (BOF) steelmaking slag is enriched in potentially
toxic V which may become mobilized in high pH leachate during weathering.
BOF slag was weathered under aerated and air-excluded conditions for
6 months prior to SEM/EDS and μXANES analysis to determine V
host phases and speciation in both primary and secondary phases. Leached
blocks show development of an altered region in which free lime and
dicalcium silicate phases were absent and Ca–Si–H was
precipitated (CaCO3 was also present under aerated conditions).
μXANES analyses show that V was released to solution as V(V)
during dicalcium silicate dissolution and some V was incorporated
into neo-formed Ca–Si–H. Higher V concentrations were
observed in leachate under aerated conditions than in the air-excluded
leaching experiment. Aqueous V concentrations were controlled by Ca3(VO4)2 solubility, which demonstrate
an inverse relationship between Ca and V concentrations. Under air-excluded
conditions Ca concentrations were controlled by dicalcium silicate
dissolution and Ca–Si–H precipitation, leading to relatively
high Ca and correspondingly low V concentrations. Formation of CaCO3 under aerated conditions provided a sink for aqueous Ca,
allowing higher V concentrations limited by kinetic dissolution rates
of dicalcium silicate. Thus, V release may be slowed by the precipitation
of secondary phases in the altered region, improving the prospects
for slag reuse.
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Hobson, Andrew
J.; Stewart, Douglas I.; Bray, Andrew W.; J. G. Mortimer, Robert; Mayes, William M.; Rogerson, Michael; et al. (2017). Mechanism of Vanadium Leaching during Surface Weathering
of Basic Oxygen Furnace Steel Slag Blocks: A Microfocus X-ray Absorption
Spectroscopy and Electron Microscopy Study. ACS Publications. Collection. https://doi.org/10.1021/acs.est.7b00874
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AUTHORS (7)
AH
Andrew
J. Hobson
DS
Douglas I. Stewart
AB
Andrew W. Bray
RJ
Robert J. G. Mortimer
WM
William M. Mayes
MR
Michael Rogerson
IB
Ian T. Burke
KEYWORDS
μ XANES analyses showBOFμ XANES analysisMicrofocus X-ray Absorption Spectroscopyair-excluded leaching experimentV host phasesV concentrationsdicalcium silicate phasesAqueous V concentrationsLeached blocks show developmentBasic Oxygen Furnace Steel Slag BlocksSEMCaCO 3air-excluded conditionsdicalcium silicate dissolutionslagElectron Microscopy Study Basic oxygen furnaceVO