RHEOLOGICAL PROPERTIES OF ACID-ACTIVATED …

bentonite dispersions can be greatly affected by the interactions between charged clay particles as well as the interactions between clay and water molecules (Gu¨nister et al., 2006). Permien …

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Techno File: Bentonite

Charge Attraction: The interaction between charged particles. Oppositely charged particles attract each other, while like-charged particles repel each other. Colloidal Particles: Particles whose …

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RHEOLOGICAL PROPERTIES OF ACID-ACTIVATED …

and the charge distribution on the clay surface can lead to a better understanding of the interactions between clay particles, because the rheological properties of bentonite dispersions can be greatly affected by the interactions between charged clay particles as well as the interactions between clay and water molecules (Gu¨nister et al., 2006).

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Chemical Industry Case Study: High Speed Dispersion of Bentonite

2. Despite the diversity of end uses, and the various processing methods and equipment used, there are a number of common processing requirements which must be satisfied in order to obtain maximized "functionality": • Mixing equipment must be capable of rapidly incorporating and dispersing the powder into the base liquid. • The bentonite particles must be …

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Principles of flow of kaolin and bentonite dispersions

At a certain higher water content the clay begins to flow when jarred slightly. This water content, again expressed as a percentage of oven-dried clay, is the Atterberg liquid limit. The difference between the liquid limit and plastic limit, the plasticity index, describes the range of water content in which a clay is plastic (Table I).

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The Modification of Rheological Properties of Bentonite Water

Bentonite suspensions with 8.0 wt% solid concentration were prepared in this study for rheological measurements. bentonite slowly to deionized water under magnetic stirring conditions, to avoid the formation of aggregates and ensure homogeneous dispersion. In the case of bentonite-surfactant dispersions, the surfactant solutions ( 1.0×10. −3. M,

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(PDF) Impact of organic contaminant viscosity and cation …

pH variations of Na-bentonite dispersion, in the water-organic mixture and in the presence of (a) 0 and 0.01 M NaCl, (b) 0.1 and 0.5 M NaCl ... Liquid limit (%) 337. Plasticity index (%) 298 ...

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THE RHEOLOGICAL AND COLLOIDAL PROPERTIES OF …

of the surfactants on the flow behavior of the dispersion in the presence of a certain amount of calcium ions. EXPERIMENTAL Two types of clays were used in the experiments: (i) an original Wyoming bentonite "Greenbond" ("Na, Ca-bentonite" in the following). It contained 79% montmorillonite (determined by alkylammonium ex- change; Lagaly 1994a).

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The Modification of Rheological Properties of Bentonite-Water

The pure bentonite dispersions were prepared by adding bentonite slowly to deionized water under magnetic stirring conditions, to avoid the formation of aggregates and ensure homogeneous dispersion. In the case of bentonite-surfactant dispersions, the surfactant solutions ( 1.0 × 10−3 M, International Journal of Chemical Engineering and ...

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Choline chloride based natural deep eutectic solvent for

The surface (face) of the bentonite plate is permanently charged with a negative charge as a result to its amphoteric properties. However, a conditional net charge is associated with the plate's edges depending on the pH of the environment, a net positive charge in acidic environments and a net negative charge in alkaline environments.

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The colloidal and rheological properties of bentonite suspensions

In the case where liquid is the dispersion medium, rather than a vacuum, this constant must be replaced by an effective Hamaker constant, calculated from the expression: …

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Colloidal stability of bentonite clay considering surface charge

The bentonite colloid suspension was prepared by the following procedure. First, the bentonite clay was dispersed in deionized Milli-Q water (18.2 MΩ cm) at a solid to solution ratio of 1:20 (50 g of bentonite in 1 L of Milli-Q water). The bentonite suspension was left in contact after dispersion with an ultrasonic device for 1 h.

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Abount Bentonite | KUNIMINE INDUSTRIES CO., LTD.

Introducing the basic knowledge of bentonite. Bentonite is a rock called "clay with 1,000 uses", and its main component is the clay mineral montmorillonite. KUNIMINE INDUSTRIES CO., LTD. is engaged in the research and development of bentonite, and the development and sale of products that take advantage of the characteristics of bentonite, centering on the mining, …

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is the bentonite dispersion liquid charged in Oman

The permanent negative surface charge of the bentonite structure facilitates cationic dye adsorption. However, its positive charge deficiency impairs the adsorption of most common …

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(PDF) Effect of Bentonite Exfoliation on Chitosan Scaffolds

Exfoliation of Bentonite 0.1 g of bentonite was dispersed in 10 mL of deionized water and it was sonicated for 6 h and was left at room temperature for 3 d. This dispersion was freeze-dried for further use. Chitosan Bentonite Scaffold Chitosan (0.1 …

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Rheological Properties of Bentonite Suspensions Modified …

Bentonite Two different types of bentonite were used, in the following named bentonite A and B. Some parameters of the characterisation of the bentonites are summarized in Table 1. Bentonite A is a natural sodium bentonite with Na+ ions in the montmorillonite interlayers. Bentonite B is an activated calcium bentonite, which means the Ca2+

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Bentonite

Most impressive is the diaphragm-walling technique. A thixotropic bentonite dispersion is used as an intermediate supporting material, obviating the need for revetting (retaining wall) when the trench is excavated. ... Materials very similar to litter, both clumping and nonclumping, are used in industry to clean up liquid spills. Bentonite ...

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Impact of organic contaminant viscosity and cation hydrated …

Soil contamination by organic and hazardous substances is a critical environmental issue, particularly in developing countries. This study investigates the limitations of double-layer theory for bentonite–organic contaminant interactions through experimental and numerical analysis. Using NaCl and KCl as salts and acetone, isopropyl alcohol, and glycerol …

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Yield Stress of Bentonite Dispersions | OMICS International

We review the factors affecting the yield stress of water dispersions of the wonder material, bentonite.

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Controlled flocculation of coarse suspensions by colloidally …

tonite. The interaction of the coarse, positively charged bismuth subnitrate particles in aqueous suspension with negatively charged, colloidally dispersed bentonite was investigated by measuring elec- trophoretic mobility, sedimentation volume, and viscosity. Gradual addition of bentonite dispersion to bismuth subnitrate suspensions

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High Speed Dispersion of Bentonite

Operation is as follows: The vessel is charged with water and the Silverson mixer is started, creating vigorous in-tank agitation. The bentonite is added and rapidly dispersed into the water. The high speed rotation of the rotor creates a …

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Liquid Crystals of Clay Dispersions | Colloid Journal

Reliable proof for the liquid-crystalline nature of bentonite dispersions was obtained in 1996 . The textures and phase diagram of a dispersion of natural bentonite were studied. An aqueous dispersion with an initial concentration of 10% was stirred for 24 h. Then, it was centrifuged for 6 h, filtered, and concentrated in vacuum.

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Surface charge characteristics of Gaomiaozi bentonite in high …

GMZ bentonite is regarded as an ideal backfill (buffer) material for China's high-level nuclear waste repository [1], [2].The bentonite minerals, characterized by a laminated structure, carry a negative charge [3,4].Their surface charge properties impact not only the adsorption capacity of nuclear elements but also play a crucial role in the formation of the …

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Rheology of bentonite dispersions: Role of ionic strength and solid

While in aqueous clay dispersions, the solid phase in the system composes of charged and disk-shaped nano-particles. Their faces carry permanently negative charges, and …

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High Speed Dispersion of Bentonite

The vessel is charged with water and the Silverson mixer is started, creating vigorous in-tank agitation. The bentonite is added and rapidly dispersed into the water. The high speed rotation of the rotor creates a powerful suction which draws the water and clay up from the base of the vessel into the workhead.

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Bentonite dispersions: Transition from liquid-like to solid-like

Comparing the results for a 10 wt% bentonite dispersion from Pelot et al. [19] with those of the present work, namely 11–13 wt%, one can conclude that in the narrow 10–13 wt% range the dispersions undergo a transition from the Bingham liquid-like behavior characterized by a viscosity and yield stress to a solid-like behavior characterized ...

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Solutions for Your TOUGHEST MIXING CHEMICALS

The vessel is charged with water and the Silverson mixer is started, creating vigorous in-tank agitation. The bentonite is added and rapidly dispersed into the water. The high speed rotation …

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Bentonite as a water-insoluble amorphous solid dispersion matrix …

Bentonite as a water-insoluble amorphous solid dispersion matrix for enhancing oral bioavailability of poorly water-soluble drugs ... by adsorbing SF onto BT under acidic conditions using the ionic interaction between cationic SF and negatively charged BT. Scanning electron microscopy (SEM), powder X-ray diffractometry (pXRD), and differential ...

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The colloidal and rheological properties of bentonite suspensions

Clay mineral crystals carry a charge arising from isomorphous substitutions of certain atoms in their ... of the clay platelet. The Hamaker constant depends on the nature of the material of the particles. In the case where liquid is the dispersion ... Bentonite or Na +-montmorillonite clay is a key component in the drilling fluids that possess ...

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(PDF) The viscosity and zeta potential of bentonite …

The adsorption of cationic surfactant on a charged surface leads to significant modification of the charge distribution in the electrical double layer, and, thus, in the interaction of particles with each other. ... The SDS surfactant was …

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