With the commonly used bentonite suspensions, a loss of suspension into the coarse soil is likely and cost-intensive, but what is more, there is a risk of soil collapse. To improve …
concentration of prepared bentonite suspension, the results of this procedure are presented on Figure 1. Then a single suspension dose was determined to achieve the desired turbidity in order to conduct critical concentration tests. Measurements were verified several times to avoid errors of measuring the volume of the bentonite suspension. …
Highlights Kaolin clay slurry did not displayed time-dependent behaviour. Bentonite and K-montmorillonite slurries showed very significant time dependent behaviour. K-montmorillonite slurries exhibit very high yield stress and significant structural recovery at high pH (> 11) even in the presence of triphosphate dispersants due to high …
Bentonite suspensions behave as thixotropic, shear thinning fluids. The rheological behaviour plays a major role for the successful application of the bentonite suspensions …
Test results showed that the thermal conductivity of sand–bentonite mixtures first increased with increasing percentage of bentonite by dry mass, then reached a peak at the range from 10% to 12%, beyond which the thermal conductivity decreased quickly. For the BHE with an optimal sand–bentonite backfill material, the heat injection and heat ...
To enhance the space suspension property of bentonite, in this paper, three surface modification methods are proposed to prepare the modified bentonite-based powder by using a silane coupling agent modification, silica encapsulation modification, and quaternary ammonium salt insertion modification. Then, changes in the characteristics of ...
bentonite suspension higher drag reduction properties. Indeed, it. is well accepted that the reduction in drag is associated with the. non-Newtonian character of the suspensions. The experimental
Stability of a bentonite suspension can be estimated by sedimentation or filtration experiments. The latter are usually performed on construction sites, using the API filter press (API 13B-1, 2009
schwerspat bentonite suspension. Nov 20, 2021 0183 32 NS 2 g was added to 100 mL of 2 wt bentonite suspension and stirred at 300 rpm for 24 h The NS-modified bentonite was centrifuged repeatedly and was dried FTIR spectrum of NS, bentonite, and NS-modified bentonite were analyzed using an irtracer-100 infrared spectrometer …
Methane Hydrate Formation and Dissociation in the presence of Bentonite Clay Suspension. V. Kumar Saw. Gas Hydrate Laboratory, Department of Petroleum Engineering, Indian School of Mines, Dhanbad, India. ... The presence of bentonite clay in synthetic seawater reduces the induction time of hydrate formation. Enthalpy of hydrate …
The objective of this study is to investigate the rheological properties of concentrat-ed bentonite suspensions, modied with sodium pyrophosphate (SPP), for evaluating a …
Key Words—Bentonite pH, Carbonate Content, Clay-water Interaction INTRODUCTION The 'pH' of soils and clays is commonly determined by electrometric measurement of the pH value of a clay suspension (e.g. 2% w/w), or of the clear supernatant after centrifugation or filtration. The pH of a clay suspension strongly influences its technical ...
The viscometric behavior of laponite and bentonite suspensions at different concentrations in shear flow is studied. It is discovered that in the equilibrium state, a …
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Bentonite is a natural clay mineral and consists mostly of montmorillonite. This main ingredient is decisive for the physical properties of a bentonite suspension such as swelling susceptibility, card-house structure and thixotropy, and also for the rheological properties of a bentonite suspension such as yield limit, viscosity and gel strength.
A bentonite (BT) suspension is extensively used as a water-based drilling fluid (WDF) for well excavation; however, it suffers from insufficient rheology and poor filtration performance at low solid content. Cellulose nanocrystals (CNCs) with nanoscale dimensions, large surface area, high stiffness, and reactive functional groups are …
Mit den Mischern A und B wurden Bentonitsuspensionen aus verschiedenen Fertigprodukten von S&B Industrial Minerals in unterschiedlichen Konzentrationen hergestellt.
behaviour of bentonite suspensions1. Bentonite suspensions behave as thixotropic, shear thinning fluids. The rheological behaviour plays a major role for the successful application of the bentonite suspensions in civil engineering. An important parameter is the yield point, a characteristic value of the suspension which
Abstract. Disturbance effect on time-dependent yield stress measurement of bentonite suspension was investigated using vane and cone and plate geometry. With …
Bentonite is a naturally occuring aluminium silicate clay which can take up several times its own weight of water to form a highly thixotropic colloidal suspension or gel. The gel structure is derived from the hydrogen bonds which develop between the clay particles (or platelets). ... The shorter processing time required to form a stable ...
For the monitoring of the rheological and physical properties of a bentonite suspension, special and usually standardised measurement processes such as the …
The pH of aqueous bentonite suspensions is known to be influenced by carbonates present even in minor amounts. On the other hand, at high solid:liquid ratios (at standard pH measurement conditions: 2% w/w suspension), the type of exchangeable cation in the smectite is also known to determine pH (particularly Na+ or Ca2+). By …
Bentonite suspensions are widely used for various civil and petroleum engineering applications such as temporary excavation fluids for slurry walls and drilling fluids for oil/gas exploration wells because of their low permeability and thixotropic nature [1–3].Moreover, recent studies show that concentrated bentonite suspensions can be …
The analogous symmetry and dimensions in the tetrahedral and octahedral sheets allow the sharing of oxygen atoms between the sheets. In the case of the `three-layer minerals' or smectite clay minerals, one alumina or magnesia sheet shares oxygen atoms with two silica sheets, one on each side. The combination of an octahedral sheet …
To address the need to deliver the bentonite suspension in a sand deposit, a method for engineering the rheology of concentrated bentonite suspensions through the addition of …
Bentonite is a fine-particle clay that is often used as a suspension agent in glazes. Bentonite has colloidal properties, which means the particles are so small and light that they disperse in water and remain in suspension rather than settle out. Clays like kaolin and ball clay are also suspension agents and are commonly found in glaze recipes.
Sensitivity of Clay Suspension Rheological Properties to pH, Temperature, Salinity, and Smectite-Quartz Ratio. Jun Kameda, Corresponding Author. Jun Kameda ... Kunipia-F is a high-purity …
Modification du comportement rhéologique d'une suspension de bentonite de forage par l'ajout de la cellulose polyanionique Khaled Benyounes (1), Adel Benchabane (2), Abderrahmane Mellak (3 ...
This main ingredient is decisive for the physical properties of a bentonite suspension such as swelling susceptibility, card-house structure and thixotropy, and also for the …
The transient behavior upon a steady shear stress is shown in Fig. 1.For the laponite suspension at 3.5 wt. % concentration, when a steady shear stress τ is applied to the system, and at low τ, the shear rate γ ̇ increases and reaches a local peak value at around 0.03 s, after which γ ̇ falls to a low value at around 0.1 s (called the "minimal" …
Stability, structural morphology, and rheological and filtration properties of bentonite (BT)–water suspensions as influenced by the addition of lignocellulosic nanomaterials, including bleached na...
The adsorption of Pb(II) ions on Na-bentonite as a function of shaking time at pH 4.2 ± 0.1 is shown in Fig. 4.Adsorption percentage (%) was derived from the difference of the initial concentration and the final one: (9) A d s o r p t i o n % = C o − C eq C o × 100 % where C o (mol/L) is the initial Pb(II) concentration, C eq (mol/L) is the concentration …
In addition, the effect of calcinated magnesite on rheology when added into bentonite suspension was also examined. Electrokinetic, rheological and stabilization studies including coagulation and gelation tests were performed to explain the mechanism of viscosity increase in bentonite suspension upon addition of the calcinated products.
The development of an osmotic pressure between groundwater and bentonite suspension, which is caused by the formation of a semipermeable structure of montmorillonite particles at the phase boundary. iii) The development of an underpressure in the penetration zone in the soil, which is caused by a very slow volume contraction of …
Optimal concentrations of modified bentonite – 5 g/l and flocculant – 10 mg/l for wastewater treatment systems in order to get rid of heavy metal ions were found.
