Physico-chemical variation in bentonite by sulfuric acid activation

Activation of bentonite by acid is an important step for adsorption of some impurities by active clay. This is so-called "activation process." The activation of bentonite is carried out in a continuous stirred tank reactor at low temperatures between 70 and 120 oC in EXPERIMENTAL PROCEEDURE Natural white calcium bentonite from the Zanjan ...

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Acid activated clays: Materials in continuous demand

Acid activation is a chemical treatment traditionally used on clays, typically bentonites in hydrochloric or sulphuric acid, to obtain partly dissolved materials with enhanced surface properties suitable for new applications or displaying interesting new behaviour. ... One application of calcium bentonite with a significant market is the ...

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Naturally occurring bentonite clay: Structural augmentation

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 ...

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Activation of Bentonite and Application for Reduction pH, …

Bentonite Activation (Activation) Bentonite as much as 5 kg dried with hot sun, then roasted at a temperature of 110oC, then cooled in crushed into powder with a size of 150 mess. Activation is then performed with the addition of 6% HCl activator, and than to stirred and soaked for 4 hours, then washed with distilled water and filtered.

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Influencing of foundry bentonite mixtures by binder activation

Activation allows us to obtain more-favorable properties of bentonite. The literature provides information on the influence of various activating agents on bentonites [3] .

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Optimization of bleaching power by sulfuric acid activation of bentonite

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 …

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Analysis of bentonite specific surface area by kinetic …

In this paper activation of a typical bentonite in the presence of sodium carbonate was studied by a modified kinetic model. Activation process was carried out at different concentrations of sodium carbonate, ranging 3.0–4.5 wt.%.The effects of sodium carbonate concentration, particle size distribution of natural bentonite, activation time …

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Activating natural bentonite as a cost-effective adsorbent for …

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 …

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(PDF) OPTIMISATION DE L'ACTIVATION ACIDE DE LA BENTONITE …

The acid activation of an Algerian bentonite was investigated using a factorial 33 experiment design in order to improve the bleaching capacity in the colza oil processing. Optimized acid ...

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Optimization of bleaching power by sulfuric acid …

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, …

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Activation of (Na, Ca)-bentonites with soda and MgO and …

The optimum moisture of the bentonite samples for soda activation was found to be 40% in our preliminary activation studies on viscosity, swelling, and filtration loss. In soda activation, soda ash powder was added to the initially moisturized bentonite samples and kneaded till all the bentonite had reacted with soda.

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Activation of calcium bentonite for use as a drilling fluid: …

To prepare the CMC-activated bentonite, different ratios of carboxymethyl cellulose (CMC) and bentonite (0.5:1, 0.25:1, 0.125:1, and 0.0625:1) were mixed …

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ACTIVATION AND PURIFICATION OF BENTONITE FOR …

The bentonite activation was done at two different reflux times (1 and 3 hour), and three different acid concentrations (1 M, 2.5 M and 5 M). To assist the interpretation of results, the bentonite samples were also studied using XRF and XRD. Bleaching power of active bentonite was initially studied using adsorption of methylene blue for optimation,

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Activation of Raw Bentonite (Afar Region) Using Sulfuric …

Sample of bentonite were obtained from Jabel Um Ali, North State of Sudan .X–ray fluorescence measurement was performed to determine the chemical composition of the raw clay. It was found that the clay contain Fe, Ti, Sr, Zr and Ca minerals.

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Sulphuric Acid Activation of a Calcium Bentonite

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 ...

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Sodium salt-assisted low temperature activation of bentonite …

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

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Effects of Bentonite Activation Methods on Chitosan Loading …

Les nanocomposites chitosan-bentonite, préparés après une activation préalable par calcination ou traitement micro-ondes du matériau argileux, sont capables d'éliminer entre 86-98% des ...

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US3909454A

A method for activation of bentonites is described. The method comprises a prior treatment of the bentonite with an organic polymer and/or an aqueous alkaline solution as known from prior art. Subsequently, an amount of 0.01 - 10% by weight from the treated bentonite of a heavy metal salt is incorporated into the pretreated bentonite and then …

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MouldMax: A Catalyst for Change in Bentonite Activation

MouldMax speeds up the activation of bentonite, making those crucial ion-dipole interactions happen more swiftly and effectively. It's like a matchmaker at a molecular dance, ensuring that every ...

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Adsorption characteristics of modified bentonites for …

2.3.4 Acid and thermal activation (ATA) of bentonite. Acid and thermal activation (ATA) of bentonite was a combination of two former processes that is AA and …

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Acid activation of Bentonite for use as a vegetable oil …

SUMMARY Acid activation of Bentonite for use as a vegetable oil bleaching agent 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 ...

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ACTIVATION AND PURIFICATION OF BENTONITE FOR THE …

The bentonite activation was done at two different reflux times (1 and 3 hour), and three different acid concentrations (1 M, 2.5 M and 5 M). To assist the interpretation of results, the bentonite samples were also studied using XRF and XRD. Bleaching power of active bentonite was initially studied using adsorption of methylene blue for ...

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(PDF) Acid activation of bentonite clay for recycled automotive …

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 ...

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Kinetic model for the isothermal activation of bentonite by …

Activation of bentonite by acid is an important step for adsorption of some impurities by active clay [6]. This is so-called "activation process". The activation of bentonite is carried out in a continuous stirred tank reactor at low temperatures between 70 and 120 °C in the presence of activation agents, mostly sulfuric acid [7].

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(PDF) Activation of Bentonite Clay with H2SO4 and Study …

This means that cation (H + ) loaded onto bentonite when activation with H 2 SO 4 acid should have different abilities to replace different cations by ion exchange. Acid activated bentonites were ...

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CN103359748A

The invention discloses activating treatment of bentonite, and belongs to the processing field of bentonite. The activating treatment comprises steps of raw material preparation, acidifying, washing, dispersing, centrifuging, filtering, drying and grinding. Produced bentonite is good in adsorption capacity, low in impurity content, high in whiteness and …

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Activation and comparison of indicators of bentonite …

Thus, during ultraviolet activation [9] of clays, due to the weakening of bonds in the crystal lattice of minerals, metal ions leave octahedral positions. This helps to increase the sorption activity of clays by 1.3 times. Work [10] presents the results of a combined method of activation of bentonite clays.

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Effect of hydrothermal alteration of Ca-bentonite in K-rich …

The concentrations of SiO 2 and Al 2 O 3 in bentonite samples reacted with DI water (DI-reacted bentonite) were slightly lower than those of raw bentonite. However, these concentrations of bentonite samples reacted with 1 mol/L KCl solution (KCl-reacted bentonite) were similar to those of raw bentonite, aside from the concentrations of SiO …

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Colza oil bleaching through optimized acid activation of bentonite…

Bentonite activation can be directed by numerous factors, and conventional parametric approaches are often laborious, requiring high numbers of experiments, and provide results that take into account only the individual (simple) effects of the parameters. More effective methods resort to factorial designs and provide fitted mathematic models ...

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Mechanism and Structure of Clay Minerals-Cetyl Trimethyl …

Selected typical clay minerals such as montmorillonite, kaolinite, illite, bentonite and S72 reservoir sand from Xinjiang are reacted for 1 440 hours at 25°C with such flooding agents as Xinjiang ...

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bentonite activation processing method

The invention discloses Bentonite Activation processing method, belongs to bentonitic manufacture fieldprise the following steps：Raw material prepares, is acidified, washing, be scattered, centrifuging and sieve worry, dry, milling, and the bentonite adsorption ability produced is good, and impurity content is low, and whiteness height, …

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Investigating the Capability of Local Adsorbent in Removing …

The intensification of acid treatment leads to a reduction in the peaks of adsorbed water bands at wavelengths of 3425.58, 2639.22, 2835.36 cm-1 (H-O-H stretching), and 1643.35, 1554.63, 1413.13 cm-1 (H-O-H bending) as a result of adsorbed water evaporation at high temperatures during bentonite thermal activation—the variation in the bands ...

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Sodium salt-assisted low temperature activation of bentonite …

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

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Characterization, Acid Activation and Bleaching …

The bentonite shows a moderate content of Na2O (2.71%) and Na2O/ CaO ratio (>1), which indicates the presence of swelling bentonite. 13 18 20, ( 23 28 Figure 1 The XRD patterns of the raw bentonite (RB) and acid activation bentonites (original angle, 2 terminate angle, 30 step width, 0.01 wavelength, 1.5406nm; with Cu tube in 40kV and …

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Investigation of Acid-Activated Iron-Based Bentonite …

In summary, SEM, EDS, XRD, and FT-IR characterization analyses show that after activation and iron-based modification of bentonite materials have not destroyed the original bentonite material structure, maintaining the original structure of the bentonite substrate material at the same time, for the activation and iron-based modification of the ...

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Acid activated clays: Materials in continuous demand

One application of calcium bentonite with a significant market is the decolourization of vegetable, animal and mineral oils. Most of the calcium bentonite …

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