Influence of magnesium on deflocculated kaolinite suspension: Mechanism and kinetic control

Landrou, Gnanli; Brumaud, Coralie; Habert, Guillaume

doi:10.1016/j.colsurfa.2017.12.040

Cited by 20 publications

(11 citation statements)

References 35 publications

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“…The results of Landrou et al [23] provided that MgO acts as an anti-dispersant for deflocculated kaolin slurries by stopping the activity of the NaHMP dispersant. However, many studies indicated that magnesite and magnesium hydroxide are usually calcined to produce MgO [42,43].…”

Section: Continuous Flow Testsmentioning

confidence: 99%

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

et al. 2019

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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 this, 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 the 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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Section: Continuous Flow Testsmentioning

confidence: 99%

“…The most recent study suggests that magnesium oxide had a greater influence on the sodium hexamethaphosphate-kaolin interactions, which have an anti-dispersant performance in the dispersions [23]. Therefore, the MgO is usually obtained by magnesite decomposition at high temperature [24].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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show abstract

“…The most recent study, suggests that magnesium oxide had a greater influence on the sodium hexamethaphosphate-kaolin interactions, which have an anti-dispersant performances in the dispersions [23]. Therefore, the MgO is usually obtained by magnesite decomposition at high temperature [24].…”

Section: Introductionmentioning

confidence: 99%

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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“…El proceso de sinterización, o cocción durante la preparación de la porcelana depende de las propiedades reológicas del caolín. Si bien se ha estudiado mucho sobre el efecto que puede tener el agua que se usa como medio de dispersión sobre las propiedades reológicas de las suspensiones de caolín (2,(4)(5)(6)(7)(8)(9)(10)(11) poco se ha estudiado cómo el agua que se usa en la obtención de este mineral puede afectar el comportamiento reológico de las suspensiones para el uso en la industria cerámica, sin embargo, el efecto puede ser muy similar. Conocer el efecto que tiene el agua usada en el proceso de beneficio de caolín por la vía húmeda puede ser muy útil para predecir el comportamiento de las suspensiones cerámicas en la preparación de porcelana.…”

Section: Introductionunclassified

“…El efecto que los dispersantes tienen sobre la viscosidad de las suspensiones se debe a la reorganización de las partículas de caolín que se dan por cambios electroquímicos (7) , por ello la presencia de iones es importante en la preparación de las suspensiones. La presencia de iones y cargas en el medio dispersante de una suspensión de caolín, también genera cambios en su reología, así, bajo potenciales atractivos puede aumentar la viscosidad de la suspensión (10) y al añadir iones como calcio, sodio, potasio o magnesio, entre otros, cambia el comportamiento de la suspensión (11,12) , es decir, ocurren cambios reológicos, como en la viscosidad, la tixotropía y/o en el esfuerzo de fluencia.…”

Section: Introductionunclassified

Effect of the Effect of the water quality of the benefit process in the rheology of the ceramic kaolin suspensions quality of the benefit process in the rheology of the ceramic kaolin suspensions

Peñuela¹,

Molina-Macía²

2019

inycomp

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In the obtaining process of the kaolin by wet way, the influence that the quality of the water inthe rheological properties of the suspensions of ceramic kaolin was evaluated, for which benefittests of kaolin were carried out, using the same raw material and water of different sources andquality. The rheological properties of the kaolin suspensions were measured in terms of electrolytedemand -DE-, thickening, the Methylene Blue Index -IAM- and the rate of deformation. Theparameters of water quality evaluated were pH, conductivity, acidity, alkalinity, total hardness andfree chlorine. It was found that when alkalinity, the acidity and conductivity of the water used toobtain kaolin increases, also does the DE of the suspensions, however, despite observing a diferentbehavior between materials obtained from washing with water with few ions content and materialsobtained from washing with water with some more ions content, no specific relationship wasfound for thickening.

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Influence of magnesium on deflocculated kaolinite suspension: Mechanism and kinetic control

Cited by 20 publications

References 35 publications

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

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

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

Effect of the Effect of the water quality of the benefit process in the rheology of the ceramic kaolin suspensions quality of the benefit process in the rheology of the ceramic kaolin suspensions

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