Investigating the mechanism of phase transformations and migration in olivine at high temperature

Michel, Rudy; Ammar, M. R.; Véron, Emmanuel; Simon, Patrick; Poirier, Jacques

doi:10.1039/c4ra01238k

Cited by 11 publications

(4 citation statements)

References 29 publications

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“…Michel et al. studied the phase transformation of olivine at high temperatures in detail. , In natural olivine, Fe is present in the form of fayalite (Fe 2 SiO 4 ). At high temperatures, it decomposes to Fe 2 O 3 , which gives a reddish color to the particles, and Fe 3 O 4 , which appears in the form of dark veins at the particle surface …”

Section: Introductionmentioning

confidence: 99%

High-Temperature Interactions between Molten Miscanthus Ashes and Bed Materials in a Fluidized-Bed Gasifier

et al. 2015

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One of the main concerns about biomass fluidized bed gasification and combustion is the risk of bed particle agglomeration due to ash melting. Although many studies have been conducted about the agglomeration mechanism using silica sand, olivine is mostly mentioned as an alternative bed material for tar decomposition, and its interaction with biomass ash has not been yet fully understood. The aim of this work is to investigate the agglomeration of miscanthus ashes, focusing on thermophysical and thermochemical aspects. Three different bed materials (silica sand (SiO 2 ), raw and calcined olivine ((Mg,Fe) 2 SiO 4 )) and an additive to prevent agglomeration (dolomite (CaMg(CO 3 ) 2 ) were tested. The effects of atmosphere and miscanthus harvest time were also investigated. It was found that the key parameter of agglomeration is the wettability of bed particles by molten ashes. In contact with ashes all three bed material showed good wetting tendencies, while dolomite had non-wetting properties. The adhesion between bed materials and molten ashes increases in the order of silica, olivine and calcined olivine. While in the case of silica sand only physical adhesion occurred, the diffusion of iron oxide into the molten ash was observed using olivine. Calcined olivine has a roughened surface which further increased the adhesion. The atmosphere did not influence the mechanism of ash/bed material interaction. On the other hand, miscanthus harvest time had a significant effect on ash reactivity and interaction with raw and calcined olivine.

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Section: Introductionmentioning

confidence: 99%

High-Temperature Interactions between Molten Miscanthus Ashes and Bed Materials in a Fluidized-Bed Gasifier

et al. 2015

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“…Raman scattering spectroscopy is well known for probing the physical and chemical properties of materials as well as the environmental effects that change these properties. It appears today as one of the efficient tools in numerous applications such as nuclear field, refractories mineralogy, in pigment analysis, and in planetary exploration owing to numerous instrumental developments (optics, fibers, and detectors). Despite these developments, some difficulties nevertheless remain, as for instance separating some various contributions from the Raman spectrum, such as luminescence, or thermal emission for high temperature measurements.…”

Section: Introductionmentioning

confidence: 99%

Nanosecond time‐resolved Raman spectroscopy for solving some Raman problems such as luminescence or thermal emission

Gueutue

Canizarès

Simon

et al. 2018

J Raman Spectroscopy

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Raman spectroscopy is experimentally widely available and relatively simple to perform at room temperature. Some difficulties nevertheless remain, as for instance separating some various contributions from the Raman spectrum, such as thermal emission for high temperature measurements or luminescence. Here, an optimized time‐resolved Raman spectroscopy system based on a gated detection and a nanosecond pulsed laser excitation (30 ns width, 532 nm wavelength) is described. The system allows contactless Raman measurements, at high temperatures, of some materials such as zirconia and yttria. An example of Raman spectra collected on yttria at very high temperature up to 2100 °C is provided. This optimized system may also be used to discriminate between Raman scattering and luminescence as demonstrated in zirconia material.

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“…This example is focused on the interest and applicability of two powerful techniques: Raman spectroscopy, particularly in its mapping mode, and in situ high-temperature X-ray diffraction [31,32]. The chemical and phase characterizations were performed via Raman spectroscopy (InVia Reflex Renishaw) using a 633 nm laser wavelength at 13 mW (laser output).…”

Section: Application Of Raman Spectroscopy and In Situ High Temperatumentioning

confidence: 99%

“…The pixel size was evaluated at 12 ± 1 mm, depending on the position of the sample and the optical adjustment. The cylindrical samples (h ∊ [30][31][32][33][34][35][36][37][38][39][40] mm, Ø ∊ [25-40] mm) were placed on two alumina rods (Fig. 9).…”

Section: Experimental Development For Image Acquisition Up To 1450°cmentioning

confidence: 99%

New advances in the laboratory characterization of refractories: testing and modelling

Poirier

Blond

Bilbao

et al. 2017

Metall. Res. Technol.

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Abstract. This publication presents new advances in the field of refractories characterization. These laboratory methods that combine experiments and numerical analyses and concern both the thermomechanical and thermochemical behaviour are illustrated through different examples: identification of asymmetrical creep, determination of elastic and inelastic properties, measurements of macroscopic deformation, phase transformations or corrosion kinetics. These advanced techniques offer the refractory community new opportunities to improve the knowledge and the prediction of the phenomena of degradation of the refractories.

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Investigating the mechanism of phase transformations and migration in olivine at high temperature

Abstract: A framework is presented to define the formation and migration mechanisms of oxides in olivine during their phase transformations at high temperature.

Cited by 11 publications

References 29 publications

High-Temperature Interactions between Molten Miscanthus Ashes and Bed Materials in a Fluidized-Bed Gasifier

High-Temperature Interactions between Molten Miscanthus Ashes and Bed Materials in a Fluidized-Bed Gasifier

Nanosecond time‐resolved Raman spectroscopy for solving some Raman problems such as luminescence or thermal emission

New advances in the laboratory characterization of refractories: testing and modelling

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