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- W1967565501 abstract "Ferromagnetic particles were separated from an alkaline fly ash and following selective sequential extractions were analysed to determine partitioning of elements among glassy and crystalline phases. Quadruplicate samples of the ferromagnetic fraction were extracted using 0.5 moll−1 HNO3 at a solution to solid ration of 16:1. The non-extracted sample, along with residues which were extracted with 7,14,21 and 28 replacements of solution, were analysed by instrumental neutron activation analysis. Extract solutions were analysed for content of Al, Ca, Fe, K, Mg, Mn, Na and Si by atomic absorption spectrophotometry. X-ray diffraction indicated that the ferromagnetic fraction contained little glassy material and was composed chiefly of crystalline magnetite with small quantities of quartz, and haematite. Most ferromagnetic particles comprised three distinct phases: a highly soluble exterior glassy veneer, a crystalline magnetite highly substituted in a variety of metals, and a less soluble aluminosilicate glass interstitial to the magnetite. A unit cell dimension (a) of 838.87 pm was calculated for the fly ash magnetite. The release of constituents during weathering, as simulated with HNO3 leaching, was similar to that previously observed for most aluminosilicate fly ash particles. The majority of the total As, B and Se was associated with the exterior of particles and removed during HNO3 leaching. Elements that commonly substitute for Fe in spinel structures, such as Co, Cr, Mn, Mg and Ni, were enriched in the extracted residues. Elements that do not commonly substitute for Fe in spinel structures were concentrated in the interstitial aluminosilicate material." @default.
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- W1967565501 date "1989-07-01" @default.
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- W1967565501 title "Leachability and partitioning of elements in ferromagnetic fly ash particles" @default.
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- W1967565501 doi "https://doi.org/10.1016/0048-9697(89)90008-9" @default.
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