The present study concerns a two-dimensional system shown schematically in Fig. 1.Two platy particles, each with thickness d, width b, and unit length, separated by a distance D at the closest ends of the two plates are placed in an electrolyte solution of valence v and bulk concentration n 0.The plane of symmetry (the "mid-plane") is denoted by Γ 0 and the …
PAMs were used to treat bentonite suspension, particle aggregation occurred regardless of the repulsive forces between the anionic PAM and the negatively charged bentonite/ kaolinite particles[11,27]. The study showed that the adsorption tendency of anionic PAM into the clay plays a key role in particle aggregate formation. ...
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 Ca 2+).By cation-exchange …
Des mesures rhéologiques, granulométriques et zétamétriques ont été effectuées sur une suspension de bentonite, des solutions de PEO (polyéthylène oxyde de masse …
fluid additives, can lead to the development of "smarter" drilling fluid systems with optimal and made-to-order rheological properties5. 6In our preceding studies,7, we used water-bentonite ...
La filtration d'une suspension de microparticules de bentonite provoque la mise en place quasi-instantanee d'un depot particulaire tres fin mais homogene sur la surface membranaire. Ce depot joue le role de membrane dynamique, sa resistance a l'ecoulement est preponderante devant celle de la membrane originale. Si la valeur de cette …
For the monitoring of the rheological and physical properties of a bentonite suspension, special and usually standardised measurement processes such as the Marsh funnel, …
The thixotropic behavior of bentonite suspensions was studied using different experimental procedures. It was found that the bentonite dispersions exhibit a tim ... Institut de …
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
At the interface where the buffer bentonite contacts with the surrounding rock of the HLW disposal repository, the bentonite is likely to extrude into the fractures under swelling …
L'objectif de ce travail est l'étude de l'effet de l'ajout d'un polymère anionique sur les caractéristiques rhéologiques d'une suspension aqueuse de bentonite algérienne de forage.
Bentonite is a complex clayey material used in civil engineering. Indeed the components and the formation modes are variable (hydrothermal or supergene). We propose to compare the filtration proper...
Des mesures rhéologiques, granulométriques et zétamétriques ont été effectuées sur une suspension de bentonite, des solutions de PEO (polyéthylène oxyde de masse moléculaire de 4.106, ...
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 cation-exchange …
L'invention a pour objet des suspensions de bentonite contenant de la bentonite, de l'eau et du papier filamenté, ainsi que leur production, leur utilisation dans des procédés de construction géotechniques, en particulier dans des terrains à perméabilité très élevée. ... bentonite paper suspension suspensions shredded paper Prior art ...
Fig. 5. Représentation schématique de l'effet de cisaillement sur le système eau-bentonite-PAC. L'ajout du PAC dan la suspension de bentonite permet
Rheological properties and zeta potentials were measured with various amounts of a 1 M HCl solution added to a 5 wt.% bentonite suspension. The amount of HCl solution …
Figure 1 montre les courbes d'écoulement de la suspension de bentonite de base et des mélanges bentonite-SDS, -CMC et -SDS-CMC. Les rhéogrammes sont tracés en suivant la même rampe montante ...
Activation dne bentonite par un set dmmonium 585 Des travaux anterieurs [14,15] ont montre que la montmorillonite est le constituant majeur de la bentonite de Maghnia. 2.2. Activation nar NH&l Dans un ballon muni dn r&iigkmnt et dn thermometre on place une suspension drgile dans une solution de chlorure dmmonium 3N (rapport massique Cgal …
Bentonite clay also has, like DE, trace minerals that can be beneficial for your body. Like DE, bentonite clay is absorptive, which allows it to draw heavy metals and other toxins and help them pass out of the body. One big difference between DE and bentonite clay, however, is that bentonite clay is much smoother than DE. This means that ...
A de-proteinising bentonite should eliminate at least 50% of the proteins in a synthetic solution with a 0.4 g/l dose. 3.18. ... Using a burette, pour 2 ml of blue solution in a container with 200 ml of suspension of bentonite maintained in agitation. After 2 minutes, add 1 ml of blue solution. This addition is followed by the spot test on ...
The Marsh funnel is a special flow cup that was designed for measurements of drilling mud viscosity. The funnel viscosity is the time required for 1000 ml to flow out of the Marsh …
tériau traité avec de la bentonite et de la bentonite/polymère en contact avec diffé-rents fluides. Après une description rapide de l'appareillage et de la méthodologie d'essai, nous présenterons les expériences qui ont été menées pour ensuite les commenter. 2. Programme expérimental 2.1. Matériau référent, adjuvants et fluides
The bentonite suspension shall be made by mixing it with fresh water using a pump for circulation. The density of the freshly prepared bentonite suspension shall be between 1.03 and 1.10 g/ml depending upon the pile dimensions and the type of soil in which the pile is to be bored. The density of bentonite after contamination with deleterious ...
Des mesures granulométriques et rhéologiques ont été effectuées sur une suspension de bentonite de base (5%), sur des solutions aqueuses de Polyoxyde d'éthylène (PEO) et sur des mélanges ...
or sub-volcanic rocks from the Cabo de Gata volcanic area (Almería Province) in the southern part of Spain; and (3) Tamame de Sayago (Zamora province) from the hydrothermal alteration of granitic Variscan rocks (García-Romero et al., 2019). The Tamame de Say-ago kaolin–bentonite deposit is found in the Sayago
The properties of drilling fluids have a very significant effect on the sucessful of a well completion and the project costs. The experimental study was conducted based on the determination and analysis of the curves of shear stress and shear rate of aqueous suspensions composed of bentonite and carboxymetil cellulose at different …
This work mainly focuses on the effect of baffle width (B) on floc growth within square stirred-tank reactors for flocculation. Firstly, a series of flocculation tests were carried out, using ...
Impact de l'échange (en suspension) Mg,Ca Pb à l'échelle de la particuleDes échanges (Mg,Ca) Pb ont été réalisés en mettant en contact 250 mg de bentonite avec 100 ml de solution de Pb(NO 3) 2 pour des concentrations allant de 10 −5 à 10 −1 mol l −1. Le pH des solutions correspondantes varie entre 5,7 et 3,8.
Bentonite suspension was prepared at 6 wt% solid concentration (the mass ratio of clay to distilled water) with different salinities to measure rheological behavior. Firstly, different …
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.
PDF | On Dec 20, 2015, Abdelhakim Benslimane and others published Laminar and turbulent pipe flow of bentonite suspensions | Find, read and cite all the research you need on ResearchGate
Le présent travail consiste à étudier l'influence de l'ajout de la cellulose polyanionique, PAC, sur les propriétés rhéologique d'une suspension de bentonite à 3%.
Invasion of fluids into porous media during drilling can lead to irreparable damage and reduced well productivity. Hence, minimizing the filtration loss of the drilling fluid into the formation is very important. The stability of colloidal suspensions plays a crucial role in controlling the interfacial forces and consequently on minimizing the filtration. The zeta …
In this work, bentonite suspension and mixtures containing 5 wt% of bentonite and 0.1 and 0.5 wt% of carboxymethyl cellulose (CMC) were investigated in terms of their rheology and hydrodynamic ...
