Influence of iron onto the structural reorganization process during the sintering of kaolins

Lecomte‐Nana, Gisèle Laure; Bonnet, Jean-Pierre; Soro, Nibambin

doi:10.1016/j.jeurceramsoc.2012.10.024

Cited by 23 publications

(11 citation statements)

References 29 publications

(26 reference statements)

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“…These values are consistent with the specific surface areas usually observed (Chotpantarat et al, 2011;Li et al, 2015;Silva et al, 2009). In previous works the increase of the specific surface area of clay enriched in iron oxides was shown to be related to the iron oxide content of the mineral in the form of nodules on clay platelets (Arias et al, 1995;Sei et al, 2006;Lecomte-Nana et al, 2013). It might also be the signature of iron oxides particles of powder size.…”

Section: Characterization Of Mineralssupporting

confidence: 90%

Binding and setting of kaolin based materials with natural organic acids

Martias

Villandier

Thune

et al. 2015

Applied Clay Science

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Section: Characterization Of Mineralssupporting

confidence: 90%

Binding and setting of kaolin based materials with natural organic acids

Martias

Villandier

Thune

et al. 2015

Applied Clay Science

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“…In the presence of TiO2, the surface area increases (from 11.48 to 19.12 m 2 g -1 ). This result was also observed by Soro et al 37 during their works. To better access, the structure of the synthesized compounds, SEM and FTIR techniques were done.…”

Section: Substrate Characterizationsupporting

confidence: 87%

Hydrothermal Sol-gel TiO2 Nanoparticles fixed to Clay and its Photocatalytic Application for the Degradation of Methyl Orange

Pohan¹,

Goure-Doubi²,

Kouyaté³

et al. 2019

Mediterr.J.Chem.,

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In this paper, Clay-TiO2 nanomaterials were synthesized via hydrothermal sol-gel method using Ivorian clays and titanium tetra-isopropoxide as precursors. The synthesized composite was characterized through XRD, SEM/EDX, FTIR and BET surface measurements. The photocatalytic activity of composite towards the degradation of methyl orange (MO), a model pollutant, has been investigated under UV and simulated solar radiation. Comparative experiments done in a solution with and without H2O2 indicate an increase in efficiency for methyl orange removal from the polluted water in the presence of H2O2. The optimized parameters (contact time, amount of nanocomposite and amount of Fe2+/H2O2) allowed to reach removal efficiency up to 60 % of MO. Immobilization of TiO2 on clay facilitate repeated using of nanomaterials, two time.

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“…(iii) an exothermic peak in the temperature range 940-1000, which is mainly due to the structural reorganization of metakaolinite (mullite formation, reaction R.2), the later phenomenon does not induce any mass variation but there is the occurrence of an endothermic shoulder or hump prior to the mullitization reaction. This trend is generally observed when the starting kaolinitic lay contains iron and/or muscovite as secondary phases [27,28].…”

Section: Raw Materials Characterizationsmentioning

confidence: 73%

Kaolinite-Magnesite Based Ceramics. Part I: Surface Charge and Rheological Properties Optimization of the Suspensions for the Processing of Cordierite-mullite Tapes

Hammas¹,

Lecomte‐Nana

Azril³

et al. 2019

Preprint

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The present study aimed at investigating the influence of the concentration of sodium silicate and sodium hexametaphosphate on the dispersion of an aqueous kaolinitic clay slurry regarding further use for the tape casting process. The zeta potential of the kaolinitic clay slurry matched the requirements for tape casting. The addition of magnesite in the kaolinitic slurries tended to increase the zeta potential towards the required limit values. Despite, the further addition of surfactants allowed improving the zeta potential in agreement with the tape casting conditions. Accordingly, the rheological behavior, under continuous and oscillatory flow conditions, of various mixtures of magnesite and a kaolinitic clay was studied. Regarding the pH and the zeta potential measurements, the E–F attraction prevailed at low pH value, and F–F or E–E attraction was predominant at high pH value. All slurries exhibited a shear thinning behavior, which was well-correlated by Herschel–Bulkley model. It appeared that the best stability for the kaolinitic clay slurries was obtained while using 0.4 mass% and 1.2 mass% of sodium hexametaphosphate and sodium silicate respectively. An increase in the magnesite concentration above 6 mass% led to a complex behavior with low cohesion energy due to the occurrence of soluble complexes.

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Influence of iron onto the structural reorganization process during the sintering of kaolins

Cited by 23 publications

References 29 publications

Binding and setting of kaolin based materials with natural organic acids

Binding and setting of kaolin based materials with natural organic acids

Hydrothermal Sol-gel TiO2 Nanoparticles fixed to Clay and its Photocatalytic Application for the Degradation of Methyl Orange

Kaolinite-Magnesite Based Ceramics. Part I: Surface Charge and Rheological Properties Optimization of the Suspensions for the Processing of Cordierite-mullite Tapes

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