Review on Bentonite Clays from Cubati (Brazil)

2021 ◽  
Vol 02 (01) ◽  
Author(s):  
Acevedo NIA ◽  
Rocha MCG
Keyword(s):  
Bentonite Clays

Influence of Organophilization Process Variables in Bentonite Clays from Cubati-PB

2012 ◽  
Vol 727-728 ◽  
pp. 1467-1472
Author(s):  
Carla Dantas da Silva ◽  
Rosa do Carmo de Oliveira Lima ◽  
Julliana Marques Rocha Costa ◽  
Gelmires Araújo Neves ◽  
Heber Carlos Ferreira
Keyword(s):  
Thermogravimetric Analysis ◽  
Bentonite Clay ◽  
Laser Diffraction ◽  
Ionic Surfactants ◽  
Organic Media ◽  
Process Variables ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bentonite Clays ◽  
Sodium Form

This work aims at the development of organoclay from two varieties of bentonite for use in organic media using ionic surfactants, studying the influence of process variables in the organophilization process. We used the following materials: natural bentonite clay from Cubati-PB District, and the ionic quaternary ammonium salt: Praepagen WB® with 45% active matter. The clays were benefited and then turned into sodium form and subsequently into organoclays. The bentonites were characterized by laser diffraction (GA) X-ray fluorescence chemical composition (EDX), thermogravimetric analysis (TGA), thermogravimetry (DTA) and X-ray diffraction (XRD). The organoclays were characterized by (XRD) thermogravimetric analysis (TGA) and thermogravimetry (DTA). The results showed that the clay has potential for application in the organophilization process and that there is influence of process variables.

Bentonite Clays Characterization in the Town of Sossego – Paraiba State

2015 ◽  
Vol 820 ◽  
pp. 65-70
Author(s):  
I.D.S. Pereira ◽  
V.N.F. Lisboa ◽  
I.A. Silva ◽  
J.M.R. Figueirêdo ◽  
G.A. Neves ◽  
...  
Keyword(s):  
Industrial Applications ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Drilling Fluids ◽  
X Ray Diffraction ◽  
Mineralogical Characterization ◽  
Bentonite Clays ◽  
The Town ◽  
Petroleum Drilling

Bentonite exhibt a range of industrial applications moving millions of dollars on the market per year. Among several applications if highlights it is use for petroleum drilling fluids. Thus, this work aims to characterize physical, mineralogical and technologically, the bentonitics clays of Sossego County, Paraíba, Brazil. Mineralogical characterization of clays was done through the following techniques: particle size analysis by laser diffraction, thermogravimetric and differential thermal analysis, chemical analysis and x-ray diffraction. The clays were turned in by treatment with sodium in Na2CO3 and then determined whether the apparent viscosity, plastic and volume of filtrate of clay-water dispersions. The results showed that the samples are of polycationic, showing levels of MgO, CaO and K2O, similar to those from Boa Vista County, Paraíba, Brazil, and consist of clay mineral kaolinite, quartz and esmec. The clays showed rheological properties that indicate potential for use in drilling fluids.

scholarly journals Peculiarities of 137Cs Sorption/Desorption by Bentonite Clays of Cherkasy Deposit from Groundwater Model Solutions of Radioactive Waste Disposal Facilities at the “Vector” Production Complex

2021 ◽  
Vol 21 (2) ◽  
pp. 78-87
Author(s):  
B. H. Shabalin ◽  
◽  
К. К. Yaroshenko ◽  
S. P. Buhera
Keyword(s):  
Radioactive Waste ◽  
Waste Disposal ◽  
Water Soluble ◽  
Radioactive Waste Disposal ◽  
Groundwater Model ◽  
Static Mode ◽  
Near Surface ◽  
Model Solutions ◽  
Production Complex ◽  
Bentonite Clays

The main feature of bentonite clays is their high sorption capacity with respect to various radionuclides. The study of sorption kinetics of 137Cs was performed in the static mode by natural and industrial soda modified (PBA-20) samples of bentonite clays of Cherkasy deposit of bentonite and paligorskite clays from groundwater model solutions of radioactive waste disposal facilities of “Vector” production complex under various pH and solution mineralisation. The desorption of occluded samples was studied in distilled water and acetateammonium buffer solution. The value of the degree of sorption (S) for 137Cs on the modified samples exceeds 90%, for natural bentonite this indicator is lower (about 83–85%). On both types of bentonite with increasing time of their contact with aqueous solution and pH, there is a redistribution of water-soluble, ion-exchange and fixed forms of radionuclide and the share of the latter, that is not participating in migration processes increases, indicating the ability of bentonites to immobilize effectively for a long time. It is shown that Na-modified bentonite has higher proportion of sorption in fixed form compared to natural one and its application increases the probability of irreversible fixation of migrating radionuclides under non-optimal conditions of sorption (high pH (>11) of water after prolonged contact with cement-concrete components of engineering barriers) and thus increases the environmental safety of the storage facility. It is shown that bentonite clays of the Cherkasy deposit can serve as an effective material for creating anti-migration barriers of I and II stages of surface/near-surface storage facilities for radioactive waste disposal at the “Vector” production complex. At the same time, the issue of practical application of bentonite clays of Cherkasy deposit for accurate predictions of securing radioactive waste disposal of Chornobyl origin requires further study of sorption-desorption properties of bentonite clay with respect to other fission products and actinides

The efficiency of modified bentonite clays for removal of aromatic organics from oily liquid wastes

1997 ◽  
Vol 4 (3) ◽  
pp. 155-164 ◽  
Author(s):  
Saeid Gitipour ◽  
Mark T. Bowers ◽  
Warren Huff ◽  
Andrew Bodocsi
Keyword(s):  
Modified Bentonite ◽  
Liquid Wastes ◽  
Bentonite Clays ◽  
Oily Liquid

Instrumental Assessment Of The Formation Of The Elemental Composition Of Wines At The Stage Of Their Clarification With Various Bentonite Clays

2022 ◽  
pp. 107145
Author(s):  
Zaual Temerdashev ◽  
Aleksey Abakumov ◽  
Mikhail Bolshov ◽  
Alexan Khalafyan ◽  
Natalia Ageeva ◽  
...  
Keyword(s):  
Elemental Composition ◽  
Instrumental Assessment ◽  
Bentonite Clays

scholarly journals Studies of new occurrences of bentonite clays in the State of Paraíba for use in water based drilling fluids

2013 ◽  
Vol 66 (4) ◽  
pp. 485-491 ◽  
Author(s):  
Isabelle A. Silva ◽  
Julliana Marques R. Costa ◽  
Romualdo R. Menezes ◽  
Heber S. Ferreira ◽  
Gelmires de A. Neves ◽  
...  
Keyword(s):  
Bentonite Clay ◽  
Particle Size Analysis ◽  
The State ◽  
Size Analysis ◽  
Drilling Fluids ◽  
X Ray ◽  
Clay Deposits ◽  
Water Based ◽  
Bentonite Clays ◽  
New Occurrences

New bentonite clay deposits have recently been discovered in the state of Paraíba, mainly in the municipalities of Cubati and Pedra Lavrada, creating great expectations in view of the possibility of expanding industrial production using these new reserves. The aim of this study was to study the new occurrences of bentonite clay in Paraíba, particularly in the municipality of Pedra Lavrada, for use in water based drilling fluids. The mineralogical properties of the clays were characterized by particle size analysis using laser diffraction, and thermogravimetric and differential thermal analysis, and its chemical composition was analyzed by X-ray fluorescence, X-ray diffraction, cation exchange capacity and specific surface area. The bentonite clays were treated with sodium carbonate at concentrations of 75, 100, 125, 150 and 175mEq/100g of dry clay, to transform them from polycationic to sodium form. For the technological characterization, drilling fluids were prepared according to the standards of Petrobras. The results indicated that the mineralogical composition of the samples consisted of montmorillonite, kaolinite and quartz. As for their rheological properties, the samples were found to partially meet the rheological requirements of the Petrobras standard.

scholarly journals Mobility and reactivity of sulphide in bentonite clays – Implications for engineered bentonite barriers in geological repositories for radioactive wastes

2017 ◽  
Vol 146 ◽  
pp. 495-502 ◽  
Author(s):  
Karsten Pedersen ◽  
Andreas Bengtsson ◽  
Anders Blom ◽  
Linda Johansson ◽  
Trevor Taborowski
Keyword(s):  
Radioactive Wastes ◽  
Bentonite Clays

Purification of Bentonite Clays from Cubati, PB, Brazil, for Diversified Applications

2014 ◽  
Vol 805 ◽  
pp. 486-491
Author(s):  
J.M.R. Figueirêdo ◽  
Juliana Melo Cartaxo ◽  
I.A. Silva ◽  
C.D. Silva ◽  
Gelmires Araújo Neves ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Chemical Analysis ◽  
Laser Diffraction ◽  
The State ◽  
X Ray Diffraction ◽  
X Ray ◽  
Granulometric Analysis ◽  
Bentonite Clays

The State of Paraíba, Brazil, retains about 88.5% of all Brazilian bentonite, and much of this production comes from deposits in the District of Boa Vista, PB. Nevertheless, the deposits are almost depleted. Recently, new deposits were found, which will increases the reserves of the State, in the regions of Cubati and Pedra Lavrada, PB. The objective of this work is to characterize and develop purified clays, through sieving and hydrocycloning techniques, from those recently discovered bentonites for several applications. The characterization of the sample was done through granulometric analysis by laser diffraction, X-ray diffraction, chemical analysis by X-ray fluorescence, and thermogravimetric and differential thermal analysis. The results show that the samples are typical of bentonite clays, and that the purification solely by hydrocyclone presents the best results.

Application of Clay for Petrochemical Wastewater Pretreatment

2009 ◽  
Vol 44 (4) ◽  
pp. 399-406 ◽  
Author(s):  
Zdenko Buić ◽  
Bruno Zelić
Keyword(s):  
Ammonium Nitrogen ◽  
Petrochemical Wastewater ◽  
Ion Removal ◽  
Phosphate Ions ◽  
Concentration Of Ions ◽  
Activated Bentonite ◽  
Bentonite Clays ◽  
Phosphorous Compounds ◽  
Bentonite Particle ◽  
Alkali Activated

Abstract Petrochemical industry wastewater is contaminated with nitrogen and phosphorous compounds, mainly ammonium and ammonium nitrogen, and therefore needs treatment before it is released in the watercourse. Usually, petrochemical wastewater treatment is carried out following the ion exchange principle. One of the possibilities of petrochemical wastewater pretreatment is using bentonite clays. Bentonite decreases the concentration of ions in the incoming wastewater and, as a consequence, the ion exchanger placed subsequently works more efficiently. The experiment was carried out with alkali-activated granulated bentonite and acid-activated granulated bentonite. In this work, bentonite particle size, the quantity and the type of bentonite, as well as the time of the contact of bentonite and wastewater were optimized. It was found that the highest percentage of ion removal of 83% for ammonia ions and 71% for phosphate ions was accomplished when the model solution was treated with a mixture of acid- and alkali-activated bentonite for 5 minutes.

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