An investigation on utilization of poly-electrolytes as dispersant for kaolin slurry and its slip casting properties

It has been well known that mineral samples from different locations and origins can exhibit a significant shift in their properties and behavior. The present study of three samples of kaolin from a wide set of origin of deposits, composition, and ceramic properties, provided an important and perhaps a unique opportunity for investigating the interdependence of mineralogy, chemical composition, particle morphology, and surface property with their rheological behavior in ceramic applications such as casting rate. The X-ray diffraction patterns of kaolin samples #2 and #3 suggested low crystallinity with Hinckley Index (HI) ranging between 0.78 and 0.8. On the other hand, kaolin sample #1 was highly ordered with HI of about 1.21, and it had higher quartz content. This free quartz could enhance the permeability and hence increase the casting rate. The abundance of divalent ions (Ca 2+ and Mg 2+) in samples #2 & #3 could result in the collapse of the electrical double layer and reduction of zeta potential, consequently, coagulation of the particles leading to an increase of viscosity and dispersant demands. The morphology study suggested the platelet particles in sample #2 & #3 would lead to slower dewatering, thus, lower casting rate than that of blocky (lower aspect ratio and narrower size distribution) particles in sample #1.

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“…The casting rate was measured following the protocol described by Eygi et al (Eygi M.S. and Ateşok G., 2008)…”

Section: Methodsmentioning

confidence: 99%

The Properties of Kaolin from Different Locations and Their Impact on Casting Rate

Badr

Yuan

Dong

et al. 2021

KONA

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“…Instead, absolute values of zeta potential prevent particle flocculation and sedimentation (stable suspension) [17][18][19]. Table 1 summarizes the different stability of colloids according to zeta potential "ζ" variation [17,19,20]: Clay and water mixtures generally exhibit non-Newtonian behaviour [21][22].…”

Section: Influence Of Watermentioning

confidence: 99%

Overview of the rheological behaviour of ceramic slurries

Vitali¹,

Giorgini²

2019

FME Transactions

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Given that the majority of raw materials used in the ceramic industry have sedimentary origins, their formation is conducted in aqueous medium, reason for which most ceramic production processes involve water for manufacturing diverse semi-finished materials. However, the rheological behaviour inherent of ceramics may infer significant impact on their processing, defining crucial parameters such as solid-to-water ratio, deflocculation level, and tpye and amount of chemical additives to be used. Thus, the present work explores the intricacy of essential aspects of rheology in ceramic slurries, intending to provide an overview of the chemical, physical and practical influence on the manufacturing of tiles from both industrial and scientific points of view.

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“…The quality of these ceramics depends on processing conditions, but especially on the raw materials. Studies have emphasized the influence of raw materials on the microstructure of porcelain ceramics [1][2][3][4][5]. However, the development of formulations for these ceramics using natural raw materials is still a complex challenge due to the diversity of clays' characteristics [1], mainly those of plastic clays, known as ball clays, used in porcelain technology.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Brazilian Northeastern plastic clays

2019

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Plastic clays are one of the main raw materials used in ceramic technology. However, there is a shortage of good quality plastic clays in the world for use in porcelain technology. The aim of this study was to characterize plastic clays from Northeastern Brazil. Chemical and mineralogical composition, particle size distribution, plasticity and green strength of the clays were determined. The analyzed clays were predominantly composed of kaolinite and quartz, and some contained smectite. The amount of iron oxide in the clays was higher than 1.0% and for some of them the values were higher than 3%; the liquid and plastic limits ranged from 22% to 48% and 10% to 32%, respectively. According to characterization data, three plastic clays had potential to be used as alternative ball clay, due to their plasticity and mineralogical characteristics.

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An investigation on utilization of poly-electrolytes as dispersant for kaolin slurry and its slip casting properties

Cited by 23 publications

References 7 publications

The Properties of Kaolin from Different Locations and Their Impact on Casting Rate

The Properties of Kaolin from Different Locations and Their Impact on Casting Rate

Overview of the rheological behaviour of ceramic slurries

Characterization of Brazilian Northeastern plastic clays

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