When the activation effect on suspensions was examined, it was seen that there were differences with the change of bentonite type towards Na-Ben in the represented rheological model. Rheological model results showed that RSM is the best model for determination of flow properties of the bentonite suspensions for raw and …

Design Engineering. 1) Study of Bentonite clay as a binding material. 2) Testing of Cement-Bentonite for Compressive strength. 3) Checking suitability of Cement-Bentonite for plastering work. 3 ...

Alkaline bentonite activation is based on the reaction of a Ca/Mg-bentonite with Na 2 CO 3 which can be applied as different phases/products. For the activation technical Na 2 CO 3 rather than p.a. or food grade is required. The technical product may vary with respect to the contents of different phases, water content, and other chemical …

Jordanian bentonite was activated by hydrochloric acid at room temperature. FTIR, XRD, TGA, and BET surface area analyses of the samples were carried out to examine the structure of bentonite before …

The design of various experiments in order to assess and simulate the effects of the acid activation of an Algerian bentonite on the bleaching capacity of Colza oil is described. Three key parameters of the acidic activation, namely acid concentration, contact time and temperature, were considered. The calculations made indicated that all …

III.1.1 Déterm ination des con ditions optimales d' activation de la bentonite de . Mostaghanem . Pour chacun de s par amètres d'activ a tion étudiés (rapport massiq ue et temps de.

In this study, the use of bentonite clay modified by acid activation is proposed. Sulfuric acid, acetic acid (v-acid/w-clay ratio=20, 40 and 60%) and sulfuric/acetic mixtures (1:1 ratio) were used ...

The alkaline activation processes we re carried out as follows: a 100g/L suspension of bentonite was prepared and kept under constant stirring, until it was completely dispersed. Solutions of Na

The obtained result in Table 2 illustrated that acid activation of bentonite significantly increased the specific surface area (from 13.19 to 29.59 m 2 /g) and total pore volume (from 0.07 to 0.09 cm 3 /g). The enhancement of textural properties of the bentonite after acid activation could be attributed to splitting of clay particles within the ...

A linear plot of ln ln(S/S 0) versus ln t will give slope b and intercept a. Fig. 4, Fig. 5, Fig. 6 show the fitting of kinetic model for activation of bentonite by sulfuric acid at different concentration of sulfuric acid. It is interesting to see that specific surface area–time data of bentonite activated by sulfuric acid fit the modified kinetic model very …

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 …

activation de la bentonite par l acide organique. Synthèse organique. Comparaison des moyens d'activation µ onde et thermique: comparaison de cette étape avec celle en . consulter en ligne; méthodes d activation de la bentonite. Équipement Utilisé Dans Le Processus D activation De La. Bentonite usine de traitement: Le broyeur à boulets ...

The aim of this work was a comparative assessment of the sorption activity of bentonite-like clay subjected to acidic, alkaline, and combined activation, in relation to …

Abstract. A natural bentonite obtained from Khorasan, Iran, was submitted to acid activation with sulphuric acid. Sample aliquots (5gr) were leached with 100 ml H 2SO 4 solutions of various ...

Three different concentrations of H 2 SO 4 (i.e., 3, 5, and 10 N) were used for the activation of 50 g bentonite. The treatment was conducted in a water bath (95–98°C, atmospheric pressure) and 250 ml H 2 SO 4 was slowly added while the mixture was agitated at 400 rpm using a magnetic stirrer. After 2 h, samples were washed (i.e., pH 7) with ...

@misc{etde_22430220, title = {Activation of a Ca-bentonite as buffer material} author = {Huang, Wei-Hsing, and Chen, Wen-Chuan} abstractNote = {Document available in extended abstract form only. Swelling behavior is an important criterion in achieving the low-permeability sealing function of buffer material. A potential buffer …

This study explores, as an alternative to sodium bentonite, the possibility of (Na, Ca)-bentonites to meet the required drilling mud properties. Activation of the bentonites was performed using the most popular (Na 2 CO 3) and also the most controversial additive (MgO) and their blends. Upgrading the (Na, Ca)-bentonites was …

Alkaline activations were performed by means of mechanochemical reactions with solutions of NaOH and Na2CO3, to increase the sodium content of bentonite clays and, thus, improve the …

In this work, the sodium salt induced activation of bentonite derived adsorbent at low temperature has been attempted. The specific surface area, and total pore volume was identified to be 426.91 m 2 /g and 0.225 cm 3 /g, respectively. Adopting methylene blue as the model adsorbate, the best chemical impregnation ratio at 1:3 resulted in a ...

Thermal activation is observed to increase the intensity of quartz peak due to the removal of impurities and removal of water from the bentonite structure. This …

Chiang Mai J. Sci. 2018; 45(4) 1773 in a desiccator for one night. The acid activation was performed using H 2 SO 4 0.1 M with bentonite to acid ratio was 1:5 (g mL-1). The activation process was ...

The bentonite is a widely available and abundant natural mineral, and can be a low cost adsorbent for water and wastewater treatment.This study reported here was directed towards identifying a cost-effective activation protocol for enhancing the adsorption capacity of Australian bentonite for removal of toxic contaminants in wastewater.

Alkaline activations were performed by means of mechanochemical reactions with solutions of NaOH and Na2CO3, to increase the sodium content of bentonite clays and, thus, …

The bentonite was first activated (A-Bent) by treatment with mineral acid, and then silylated (S–A-Bent). The treatment of the clay with mineral acid (e.g. acid activation) dissolves impurities such as calcite, opens the edges of the platelets and consequently increases the surface area and the pore diameters (Kooli, 2008).

The sodium salt-assisted low temperature activation of bentonite (BB) was attempted. The unique features of the raw bentonite and BB were characterized with …

Acid activation technique was opted for modifying natural bentonite (NB) to enhance the adsorptive removal of CIP from water. The BET surface area analysis revealed that acid-activated bentonite (AAB) possessed more than two fold higher …

Acid activation was carried out by heating muds prepared from Ca-rich bentonite (CaB), sulfuric acid (H 2 SO 4) and distilled water, yielding various bleaching earths (BEs).The roles of each of the process variables, namely mass fraction of H 2 SO 4 (x) in the dried CaB and pure H 2 SO 4 mixture, heating temperature (T) and contact time (t), in the activation …

Acid activation is a modification technique that aims to produce partial dissolution of the adsorbent to enhance the adsorptive properties, surface crystallinity, …

A new process for manufacturing organically compounded bentonite was developed successfully based on the organic intercalation and layered structure of bentonite. The main steps in the proposed process included wet sodium activation of bentonite ore, organic compounding and high-pressure roll grinding. The optimum …

Line activation bentonite. consulter en ligne; Activation conditions of bentonite supports over gold . The activation of the bentonites was carried out by two methods, (i) thermal activation and (ii) acidic activation. The operating range of the thermal activation studies was determined as 100, 300, 500, 700 °C.

The bentonite clay after acid activation was used as a catalyst for diester preparation using succinic acid and ethanol. The conversion of succinic acid was 62% with high yield (73%) of valuable diester demonstrating high activity and selectivity. It was confirmed that acid treatment is an economical (∼ $400/t) and effective way of preparing ...

Example 1 To 500 kg. of bentonite clay, 15.5 kg. of Na CO dissolved in 100 liters of water were introduced. The two latter agents constituted the activator. The solution of the activator was poured on the material which was placed on a belt-type unloading conveyor associated with a multibucket excavator and leading to the steel trucks of a narrow-gauge railway …

n. Activation De La Bentonite Par L acide Organique.Activation d'une bentonite par un sel d'ammonium.Activation d'une bentonite par un sel d'ammonium: Évolution de la capacite d'échange et de la surface spécifique Activation of a bentonite by an ammonium salt: evolution of the exchange capacity and of the specific surface area.Obtenir le …

Comparison tests with 4700 and 8000 g sodium bentonite and 8000 g calcium bentonite at 15 kPa showed for D 4000 permittivities of ψ=4.7×10 −9 l/s, for D 8000 ψ=3.1×10 −9 l/s and for D 8000 calcium bentonite ψ=2.3×10 −8 l/s (see Fig. 6, Fig. 11). Previous attempts to produce medium-weight calcium GCLs were given up due to the …

3.1.4. Determination of BET Surface Area. The surface area of bentonite shows a significant increase with activation by acid. Measured values are 66.2 and 287.8 m 2 g −1 for raw and activated bentonite, respectively. Since this increase is a result of removing impurities, replacement of exchangeable cations, such as K +, Na +, and Ca …

Natural and active clays are usually used as bleaching agents for edible vegetable oils [3], [4], and clay activation is usually done with inorganic acids such as H2SO4 [5], [6] and HCl [7], [8 ...

Abstract: A new method of Na-activation of raw bentonite, rich in Ca-montmorillonite, consisting of combined thermal treatment at 200 C, followed by immediate impregnation …

Microwave irradiation as a means for heating bentonites during acid activation has been investigated in the past but it has never been optimized for industrial applications. The purpose of this study was to apply a factorial 23 experimental design to a Serbian bentonite in order to determine the influence of microwave heating on the acid …

The effects of activation parameters (time and temperature) on its physiochemical properties and its performance for the removal of sodium ions from water were investigated. Bentonite activated for 6 h at 300 °C showed a maximum specific surface area of 81.74 m 2 /g while the raw one showed 57.6 m 2 /g. However, the cation …