Nowadays, due to the most application of montmorillonite, its purification from raw bentonite has great importance. More than 76% of bentonite is composed of montmorillonite, and its industrial ...
The particle size of raw bentonite decreases with increasing the grinding time but it is needed to stay within a certain range to avoid excessive grinding that hinders the purification.
Nowadays, due to the most application of montmorillonite, its purification from raw bentonite has great importance. More than 76% of bentonite is composed of montmorillonite, and its industrial ...
However, the cation exchange capacity value of the raw bentonite was found to be 82.1 meq/100 g while the value was reduced to 67.2 meq/100 g for treated bentonite with high specific surface area. To check the performance of the activated bentonite for desalination application, batch adsorption of sodium from synthetically produced sodium ...
Purification of raw bentonite was done by removal of quartz. This includes repeating the following steps (Khoury, 2000): first, mixing raw bentonite with water. Second, centrifugation at 750 rpm. Third, decanting into a large bottle. The decanted suspensions were collected, filtered and dried overnight at 110 °C, and kept in a desiccator.
The raw bentonite ore contains many impurities and consists mainly of Ca-bentonite. In this study, sodium chloride (NaCl), sodium carbonate (Na 2 CO 3 ), …
Raw Ca-bentonite was purified using a combined wet sieving and sedimentation processes, followed by thermochemical treatment with Na 2 CO 3 to increase its swelling capacity. The detailed analysis of the PSD …
The influence of the grinding time of raw bentonite, the dispersant dosage in bentonite dispersion, and the centrifugal speed on the purification of bentonite were …
The particle size of raw bentonite decreases with increasing the grinding time but it is needed to stay within a certain range to avoid excessive grinding that hinders the purification ...
Mineralogical data proved that the raw bentonite is mainly composed of smectite and illite with small quantities of gangue minerals such quartz, feldspars …
Nowadays, due to the most application of montmorillonite, its purification from raw bentonite has great importance. More than 76% of bentonite is composed of montmorillonite, and its industrial applications are related to its montmorillonite content. In this study, the nanoclay was extracted from bentonite by the use of centrifugal force.
The particle size of raw bentonite decreases with increasing the grinding time but it is needed to stay within a certain range to avoid excessive grinding that hinders the purification.
Purification of Raw Bentonite. The purification steps were followed in detail as mentioned in the previous study . The raw bentonite sample was dispersed in distilled water at 22°C, and the clay fraction was recovered by centrifugation at 700 rpm for 4.0 min. This process was repeated four times, in order to guarantee obtaining samples in a ...
methodsoforgano-bentonite preparation, andperhaps improper measurements obtained by the use of non-calibrated instru-ments. The CEC of bentonite is not taken into account when determining the CTAB concentration in most studies. The objectives of the present study were: (1) to improve the purification of raw bentonites using simple physical
A simple method for physical purification of bentonite. Zhijin Gong, L. Liao, +1 author. Xiaoyu Wang. Published 2016. Environmental Science, Materials Science. Applied Clay …
Nowadays, due to the most application of montmorillonite, its purification from raw bentonite has great importance. More than 76% of bentonite is composed of montmorillonite, and its industrial ...
Bentonite, supplied by Sigma-Aldrich was applied as the raw precursor in this work. The acid modification was conducted by properly mixing bentonite with 8 M of nitric acid at 75 °C and 100 rpm.
Introduction: Bentonitic clays from the Hammam Boughrara deposit in the Maghnia area (northwestern Algeria) were studied by mineralogical, chemical and physicochemical characterization to evaluate their potential suitability as raw and purified materials in pharmaceutical and cosmetic applications. Methodology: Natural bentonite …
Purification of raw bentonite2.2.1. Method-I: simple sedimentation using (Na (PO 3)) 6 as a dispersing agent. 5 g of bentonite was added to 1 L deionized water containing 0.25 g (Na (PO 3)) 6 as a dispersing agent and stirred for about 1 h. The dispersion was placed undisturbed at 25 °C and after 15 h, the supernatant above 10 cm …
Therefore, the modification and purification of raw bentonite ores to obtain high purity Na-bentonite is necessary to improve the application of bentonite. The sodium modification of bentonite is an exchange process between Na + and Ca 2+ using the ion exchange properties of bentonite [14], [15]. The methods of sodium modification can be ...
al., 2013). The performance of raw bentonite is determined by the smectite content and type (composi-tion, particle size, and etc.) as well as the kind and the amounts of other minerals such as quartz and cristoba-lite. When the bentonite purification is complete and non-smectite minerals removed effectively, the purified
This experiment increased the montmorillonite content of the bentonite from 44% to 96.5% with montmorillonite yield over 70%. The influence of the grinding time of raw bentonite, the dispersant dosage in bentonite dispersion, and the centrifugal speed on the purification of bentonite were investigated.
Raw bentonite with the following physicochemical properties was used: surface area of 45 m 2.g −1, mean pore diameter of 7.7 nm, total pore volume of 0.0898 cm 3.g −1, swelling index of 15 mL/2 g, and CEC of 58 meq/100 g. Residual olive oil was purchased from an olive oil refinery and its FFA profiles and physical properties were …
The raw bentonite contained feldspar, quartz, and cristobalite, and feldspar and quartz were removed by the new purification procedure. The purification was …
The purification treatments were applied both on raw bentonites and on bentonite modified with PEO (polyethylene oxide) as montmorillonite/PEO complexes can be used as fillers for the preparation of nanocomposites with various polymer matrices (Dang, 2005, Golebiewski et al., 2008). In this paper, the purification of the Vietnamese …
Raw and modified bentonite has been used to develop effective sorbents to remove phosphate from aqueous solution. Acid thermoactivation, Rewoquate, Irasoft, calcium, Fe and Al were employed to treat the bentonite. Results show that samples adsorption capacity for phosphate is in the order of, unmodified bentonite = acid …
The experimental results showed that purification of biodiesel by dry washing using activated bentonite resulted in a better yield and quality than wet washing and dry washing using non-activated ...
Among the few fields of application, bentonite can be used for the purification of gases, the elimination of radioactive elements ... 3.1 Physical-chemical characterization of raw and treated bentonite. Commercial bentonite (BTC) in the form of a very fine white powder was purchased from Rhône Poulenc. Its origin is a volcanic clay …
Bentonite clays containing mostly montmorillonite as a nanostructure group of smectite have been used as industrial raw material in many applications. The presence of the other impurities in bentonite clays reduces the value of bentonite. Therefore, the bentonite purification is necessary.
Purification of Bentonite. ... A significant weight loss is observed in the raw bentonite in the range between 325 and 720°C, with a maximum at 350°C, which can be attributed to the dehydroxylation of the clay minerals present in the clay, whereas, for the activated bentonite, the weight loss has taken place in a smaller range, from 410 to ...
The purification of the raw bentonite In the case of the physical purification method, Mt particles (size fractions <2 μm) were separated by centrifugation ( Thuc et al., 2010 ). Typically, 10 g of the raw bentonite dried at 110 °C for two hours was dispersed in 0.20 L of deionized water and mixed for 24 h.
Bentonite, with montmorillonite as the base clay, was modified with hexadecethyltrimethylammonium bromide (a cationic surfactant) in the amount of 1.0 cation exchange capacity (CEC) of bentonite ...
The raw bentonite was chemically purified according to classical purification method of Bergaya et al. 2013 [9, 10]. About 25 g of raw bentonite was first dispersed in 400 mL of 1 M NaCl solution ...
Abstract. Nowadays, due to the most application of montmorillonite, its purification from raw bentonite has great importance. More than 76% of bentonite is …
The purification treatments were applied both on raw bentonites and on bentonite modified with PEO (polyethylene oxide) as montmorillonite/PEO complexes can be used as fillers for the preparation of nanocomposites with various polymer matrices (Dang, 2005, Golebiewski et al., 2008).
Highlights. A bentonite with 44% montmorillonite was purified adopting a simple method. Purified bentonite with montmorillonite content of 96.5% and montmorillonite yield of 70% was obtained. Appropriate grinding of raw bentonite and …
Raw bentonite (RB) was activated using sulfuric acid, nitric acid, and phosphoric acid solutions with concentrations of 1, 5, and 10 mol/L, respectively. ... Therefore, there is a possibility that the developed acid-activated bentonite in this study contributes to wastewater purification. However, further studies are necessary to elucidate the ...
