Non-Newtonian behavior of solid-bearing silicate melts: An experimental study

Liu, Zhuangzhuang; Zhang, Ling; Malfliet, Annelies; Blanpain, Bart; Guo, Muxing

doi:10.1016/j.jnoncrysol.2018.04.042

Cited by 18 publications

(22 citation statements)

References 38 publications

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“…viscosity), several models have been developed [8][9][10]. Although viscosity of fully liquid slag systems can be calculated sufficiently, its calculation for partly crystalline slag systems are of greater challenge [6,11]. Recent studies [12][13][14][15] indicated the impact of crystallisation on the slags viscosity.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Crystallization Processes of Three Oxidic Gasifier Slag Systems

Schupsky

Guo

Blanpain

et al. 2020

Journal of Energy Resources Technology

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In entrained flow gasifiers, the production of oxidic slag accompanies the gasification process. This slag forms a layer on the refractory walls, flows downwards gravitationally, and is collected in a water quench. Hence, the slag flow must be constant, since a slag blockage represents a worst-case-scenario. Crystallization of the slag increases slag viscosity, subsequently leading to a possible slag blockage. Therefore, crystallization processes in oxidic slags need to be understood and hence investigated. In this study, three artificial, coal ash related oxidic slag systems were analyzed on their crystallization behavior. Therefore, their melt behavior was investigated via hot-stage microscopy and differential thermal analysis (DTA). Additional thermochemical calculations were performed to predict crystallized phases. Subsequently, quenching experiments were conducted to generate supercooled crystallization in the slag samples. These samples were analyzed afterward via X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the morphologies of crystals were characterized/described. In-situ observations on crystallization growth were performed by using a confocal laser scanning microscope (CLSM). Finally, crystallized phases were compared with results obtained from thermochemical calculations, and the impact of kinetics on the distributed phases was discussed. The knowledge on the crystallization behavior of various phases can be transferred to other slag systems and can improve general crystallization predictions made by thermochemical calculations.

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Section: Introductionmentioning

confidence: 99%

Investigations on Crystallization Processes of Three Oxidic Gasifier Slag Systems

Schupsky

Guo

Blanpain

et al. 2020

Journal of Energy Resources Technology

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“…Slag It was reported that solid-bearing slag exhibit various non-Newtonian flow characteristics with increasing solid fraction. [15][16][17] As shown in Fig. 9, the slag 1 and 4 display a linear relationship between rotational speed (shear rate) and percent torque (shear stress) at 1 600°C, indicating a Newtonian behavior.…”

Section: Non-newtonian Flow Behavior Of Solid-bearingmentioning

confidence: 83%

Experimental Study on the Viscosity of Stainless Steelmaking Slags

et al. 2019

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The influence of temperature, slag basicity and Cr 2 O 3 content on the viscosity of stainless steelmaking slags has been experimentally determined. The viscosity is mostly affected by the combination of basicity and Cr 2 O 3 content. The results are discussed by considering the Iida model for the fully liquid slag and the Herschel-Bulkley equation for the solid-bearing slag. For the liquid slag, the predicted viscosity values by the original Iida model do not agree very well with the measured ones, because the model does not include the amphoteric behavior of Cr 2 O 3 and underestimates the basic character of Al 2 O 3. With the presently optimized parameters in the Iida model, the calculation is consistent with the measured viscosity values of the fully liquid slag with an error of 30%, which is fairly acceptable. At high basicity and high Cr 2 O 3 contents, the presence of solid particles in slag has a paramount influence on the viscosity. It was also found that the solid-bearing slags exhibit evident Bingham pseudoplastic behavior with a residual torque of 0.12 mNm and 0.99 mNm in the investigated samples.

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“…This nonlinear relationship represents the higher viscosity of hydrogels which is a strong indication on the impact of cross-linking [22]. The viscosity of a shear thinning liquid has an inversely proportional relationship with the shear rate, whereas a shear thickening liquid has a directly proportional relationship between viscosity and the shear rate [37]. Pseudoplastic nature is important for topical formulations that have viscous behaviour under static conditions; nevertheless, this viscous behaviour tends to decrease at a higher shear rate which results in better spreadability and improves the drug permeation of specific substances upon topical application [11].…”

Section: Sem Morphologymentioning

confidence: 99%

Synthesis of Biomaterial-Based Hydrogels Reinforced with Cellulose Nanocrystals for Biomedical Applications

Dara

Raghavankutty

Deekonda

et al. 2021

International Journal of Polymer Science

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Cellulose nanocrystals (CNC) were prepared by formic acid hydrolysis and TEMPO- (2,2,6,6-tetramethyl-piperidine-1-oxyl-) mediated oxidation. The prepared CNCs were reinforced into biopolymers chitosan (CHI), alginate (ALG), and gelatin (GEL) to obtain “CNC-ALG-GEL” and “CNC-CHI-GEL” hydrogels. The synthesized hydrogels were characterized for physicochemical, thermal, and structural characterization using Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), thermal gravity analysis (TGA), and X-ray diffraction (XRD) analyses. Notably, the reinforcement of CNC has not altered the molecular structure of a biopolymer as revealed by FT-IR analysis. The hydrogels reinforced with CNC have shown better thermal stability and miscibility as revealed by thermal gravity analysis. The physicochemical, thermal, and structural characterization revealed the chemical interaction and electrostatic attraction between the CNC and biopolymers. The biocompatibility was investigated by evaluating the viability of the L929 fibroblast cell, which represents good biocompatibility and nontoxic nature. These hydrogels could be implemented in therapeutic biomedical research and regenerative medicinal applications.

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Non-Newtonian behavior of solid-bearing silicate melts: An experimental study

Cited by 18 publications

References 38 publications

Investigations on Crystallization Processes of Three Oxidic Gasifier Slag Systems

Investigations on Crystallization Processes of Three Oxidic Gasifier Slag Systems

Experimental Study on the Viscosity of Stainless Steelmaking Slags

Synthesis of Biomaterial-Based Hydrogels Reinforced with Cellulose Nanocrystals for Biomedical Applications

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