GSA Bulletin ; 4 : — Five evolved high-potassium glauconitic micas from cm below the bentonite yield a Rb-Sr isochron date of Six evolved high-potassium glauconitic micas from cm above the bentonite yield a Rb-Sr date of Agreement of Rb-Sr and K-Ar biotite dates in the bentonite with Rb-Sr and K-Ar glauconitic mica dates in the underlying and overlying carbonate suggests that carefully selected, evolved glauconitic mica that has neither been deeply buried nor experienced cation exchange with ground water can provide reliable isotopic ages and constraints for the standard geologic time scale. Shibboleth Sign In. OpenAthens Sign In.
The aim of this work was to compare the influence of organocations with different length of alkylammonium chain on the structural stability of clays towards mechanochemical treatment. The products were investigated by X-ray diffraction analysis, thermal analysis, scanning electron microscopy and energy dispersive X-ray analysis. The long-chain organic cations apparently enhance the structural stability of bentonite during high-energy grinding.
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Mixed-layer illite-smectite in the Kinnekulle K-bentonite, northern Baltic Basin of X-ray diffraction (XRD), atomic-force microscopy (AFM) and K-Ar dating.
Year of fee payment : 4. Year of fee payment : 8. An animal litter such as a clay material is treated to reduce the bulk density thereof by contacting the clay material with an aqueous electrolyte solution and then heating at an elevated temperature. Substantial reductions in bulk density have been achieved without reducing the absorption capacity of the clay granule.
Provisional Application Ser. The most commonly used litter box absorbent materials are inexpensive clays, such as calcined clays, that are safe and non-irritating to the animals, and that absorb relatively substantial amounts of liquids. Other porous, solid litter box absorbent materials, that are used alone or in combination, include straw, sawdust, wood chips, wood shavings, porous polymeric beads, shredded paper, sand, bark, cloth, ground corn husks, cellulose, and water-insoluble inorganic salts, such as calcium sulfate.
Each of these absorbent materials has the advantage of low cost, but each suffers from the disadvantage of merely absorbing a liquid waste product and holding the product within its porous matrices, or, in the case of sand, absorbing the liquid dross on its surface.
The main objective of this study was to remove heavy metals such as Cu, Co, Zn, Pb, As, Cd and Cr from industrial wastewater by adsorption using local bentonite clay and roasted date pits. The concentration level of various heavy metals in the industrial wastewater of Riyadh City was above the permissible recommended limits. Also, the concentration level of hazardous heavy metals in the treated water was within the permissible limits for crop production.
The study showed good potential for removing heavy metal ions from industrial wastewater by adsorption using local bentonite clay and roasted date pits. Recent industrial revolution in Saudi Arabia has enormously increased the industrial wastewater production which is highly contaminated with various types of heavy metals. Heavy metal contamination exists in waste effluents of different factories such as metal plating, mining operations, tanneries, chloralkali, ceramic painting, manufacturing paints, catalysts, alloy industries, wire conducting, galvanizing iron, polymer stabilizer, storage batteries manufacturing, semiconductors, pesticides, wood preservation and pigments factories Kadirvelu, ; Brezonik, ; Patterson and Passino, ; Pescod,
We produce a variety of organically modified bentonite and hectorite clays as well Please state your consent ID and date when you contact us regarding your.
Effective date : This invention relates to a process for treating a bentonite and a bentonite treated by the process that is suitable for use as a softener in soaps, laundry bars, and other detergent compositions for fabrics. Bentonites which are colloidal aluminium silicates have previously been proposed as softeners for detergents based on their swelling and ion exchange properties.
However, in general, bentonites form a gel on contact with water and the presence of the gel on the surface of the bentonite particles tends to prevent penetration of water into the particles and hence inhibits dispersion of the bentonite material. The process of this invention differs from traditional processes for treating bentonite in that traditional processes seek to retain the high gelling and high swelling properties of the starting material.
As a result of gel blocking, the bentonite particles have to remain in contact with water for many hours before penetration of the water into the particles and complete gelling of the bentonite is achieved. For this reason measurements of gelling are not normally carried out on bentonite until it has been in contact with water for around 24 hours. The purpose of the invention, on the other hand, is to degrade the gelling and swelling properties of the original starting material with the result that the particles disperse very rapidly in water without gel blocking and this makes the material particularly suitable for use as a softener.
In more detail, bentonite consists of platelets of aluminosilicate spaced apart and held together by metal cations. The structure already contains some water of crystallisation between the platelets. If the bentonite is heated to such a high temperarture that this initial water is driven off, the bentonite largely loses its ability to re-absorb water and therefore to swell and gel.
The process of the present invention breaks down the original structure of the bentonite whilst driving off the initial water, so that the bentonite loses its ability to swell and gel.
CA2198583C – Compacted bentonite-based absorbents – Google Patents
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Source: International Food Research Journal.
Modification of bentonite with orange peels extract and its application as mycotoxins’ Journal of Cleaner Production (IF ) Pub Date: , DOI.
This report focuses on Food Grade Bentonite volume and value at the global level, regional level and company level. From a global perspective, this report represents overall Food Grade Bentonite market size by analysing historical data and future prospect. This study provides information about the sales and revenue during the historic and forecasted period of to Understanding the segments helps in identifying the importance of different factors that aid the market growth.
The report has been curated after observing and studying various factors that determine regional growth such as economic, environmental, social, technological, and political status of the particular region. Analysts have studied the data of revenue, sales, and manufacturers of each region. This section analyses region-wise revenue and volume for the forecast period of to These analyses will help the reader to understand the potential worth of investment in a particular region.
Global Food Grade Bentonite Market: Competitive Landscape This section of the report identifies various key manufacturers of the market. It helps the reader understand the strategies and collaborations that players are focusing on combat competition in the market. The comprehensive report provides a significant microscopic look at the market.
The reader can identify the footprints of the manufacturers by knowing about the global revenue of manufacturers, the global price of manufacturers, and sales by manufacturers during the forecast period of to
Alan F Witthoeft , Purdue University. The phenomenon of liquefaction, the loss of effective confining stress in a saturated soil deposit, is a potential cause of severe damage to structures. Liquefaction, particularly that occurring under cyclic or dynamic loading conditions, is generally attributable to a combination of 1 a tendency for volumetric contraction of the soil matrix and 2 the negligible compressibility of the pore fluid relative to that of the soil matrix.
Several schemes for liquefaction mitigation have been put forth which propose to affect one of these two factors. One such approach, the replacement of the pore fluid with thixotropic bentonite slurry is particularly relevant to this study.
To date, around sites have been found worldwide, including numerous in Europe, our Bentonite is mined in Southern Europe. The quality testing of our raw.
Raji, Y. Journal of Membrane Science and Research , , -. Journal of Membrane Science and Research , , , , -. Journal of Membrane Science and Research , ; : -. Toggle navigation. The use of low-cost clay materials for the fabrication of ceramic membrane has attracted much interest from researchers, and the outcome would be beneficial to the industries. In this study, low-cost bentonite was used for the preparation of hollow fiber ceramic HFC membrane. Bentonite powder was initially characterized by field emission scanning electron microscope FESEM for powder surface morphology.
Comparison the Effect of Bentonite and Calendula on Improvement of Diaper Dermatitis Of Infants
dating bentonites and other vol canically derived strata in the British stratotypes, against which all other lower Paleozoic biostratigraphic sections throughout.
The Earth Sciences Museum is temporarily closed until further notice. We apologize to all of our visitors and groups for this inconvenience. Thank you for your understanding. Back to Rocks and Minerals Articles. Bentonite was first named Taylorite, after William Taylor, who studied clay deposits in the United States. The use of the name Taylorite stopped when this group of minerals was split up into separate groupings.
In , W C Knight used the name bentonite to refer to this specific type of clay because the first site discovered was near Fort Benton in the Wyoming, Montana region of the United States.
The Open Construction & Building Technology Journal
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Hatcher Published This report presents the preliminary results of a study to determine the feasibility of dating Late Cretaceous bentonite beds in southwestern Manitoba using U-Pb zircon geochronology.
This report presents the preliminary results of a study to determine the feasibility of dating Late Cretaceous bentonite beds in southwestern Manitoba using U-Pb.
Treatment of acid mine drainage using un-activated bentonite and limestone. Characterization and an investigation on ceramic properties of selected continental clay materials. Showing items 1 – 3 of 3 Your selections: Bentonite. Resource Type. Toggle facets Facets. Add All Items to Quick Collection. Sorted by Date Title Creator Date. Quick View. Treatment of acid mine drainage using un-activated bentonite and limestone – Nkonyane, Thembelihle , Ntuli, Freeman , Muzenda, Edison.
The adsorption process followed the Langmuir isotherm and pseudo second order kinetic models. The maximum adsorption capacities were 0. The adsorption of Cu and Ni was thermodynamically spontaneous. Cu adsorption was endothermic whilst Ni adsorption was exothermic.
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However, age analysis of Late Cretaceous Argentinian bentonites and associated volcaniclastic rocks from Lago Pellegrini, Northern Patagonia, indicates that, in the case of these very low-permeability rocks, the radioactive 40 Ar was retained and thus can provide information on smectite age and the timing of rock alteration. This is a preview of subscription content, log in to check access.
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study to date has demonstrated the effectiveness of bentonite treatment at the field both for clean (i.e. untreated) sand and for sand treated with bentonite.
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The basic clay rock containing montmorillonite, used as a common binding material for traditional foundry sand mixtures, is bentonite. The.
Ito , H. Komine , S. Morodome, T. Sekiguchi, G. In geological disposal of high level radioactive waste, it is essential to start considering consolidation accompanying cementation, taking into consideration high earth pressure and solution of groundwater. For engineering application of natural analogue, the authors thought consolidated buffer material will have similar physical properties to bentonite ore. In this study, we aimed to quantitatively evaluate the influence of cementation on swelling properties.
In order to achieve this aim, we focused on swelling pressure and swelling strain of bentonite, using two kinds of bentonite ore whose generation dates are different respectively. As a result, swelling pressure was decreased by approximately one order of magnitude due to the influence of cementation. In addition, the swelling strain of younger bentonite ore did not decline, but those of older bentonite ore declined about half of original whether consolidation was retained or not.
Therefore, there is a possibility that the swelling deformation of buffer will decline as cementation gets stronger over the course of time.