RSC Advances ◽  
2016 ◽  
Vol 6 (46) ◽  
pp. 40258-40269 ◽  
Author(s):  
Shoujuan Wang ◽  
Mohan K. R. Konduri ◽  
Qingxi Hou ◽  
Pedram Fatehi

The work presented herein focused on the flocculation of kaolin and bentonite clay suspensions using cationic copolymerized xylan under controlled conditions.


Author(s):  
S. A. Jenekhe ◽  
H. T. Davis ◽  
L. E. Scriven

Aqueous suspensions of clay mineral particles evidently form gels owing to interactions between the electrically charged particles. It is generally accepted that physical properties of a suspension, especially rheological properties, reflect its microstructure and that deformation brings about structural changes (1) We have applied fast-freeze cold-stage scanning electron microscopy to visualize the microstructures of bentonite clay suspensions of known shear history.


2001 ◽  
Vol 19 (1-6) ◽  
pp. 103-120 ◽  
Author(s):  
M Benna ◽  
N Kbir-Ariguib ◽  
C Clinard ◽  
F Bergaya

2016 ◽  
Vol 881 ◽  
pp. 206-211
Author(s):  
R.C.A.M. Nascimento ◽  
A.C.A. Costa ◽  
L.A. Fernandes ◽  
Luciana Viana Amorim

In clay suspensions designed for drilling, the sodic bentonite clay is commonly chosen for its better hydration capacity compared to the other kinds. The sodium bentonite clay is essentially composed by montmorilonite, a clay mineral that belongs to the group of smectites. This work aims to evaluate the behavior of clay suspensions under different thermic conditions. For that, were studied suspensions prepared with sodium bentonite clay, in concentrations varying between 2.5% and 6.4%, under different temperatures and also types of aging. The suspensions were tested based on a matrix of experimental planning. The filtration properties were determined by the filtrate volume, the relation of filtrate volume with time of filtration, the mudcake thickness and the permeability of the mudcake. The results exhibited that the high temperature promotes a gelification state of the suspensions, being therefore responsible for the high values of the filtration properties.


Author(s):  
А.Г. АБАКУМОВ ◽  
З.А. ТЕМЕРДАШЕВ ◽  
Н.М. АГЕЕВА

Использование суспензий бентонитовых глин при обработке виноматериалов в процессе их осветления и стабилизации оказывает влияние на минеральный состав вин. Виноматериалы могут обогащаться катионами металлов, оказывающими разнонаправленное влияние на качество и розливостойкость вина. Исследованы изменения элементного состава виноматериалов в результате их обработки 32 образцами бентонитовых глин различных торговых марок. Объектами исследования были образцы виноматериалов из винограда сортов Каберне-Совиньон, Мерло и Молдова, собранного на территории Краснодарского края в 2019 г. Методами ИСП-АЭС и ИСП-МС определен элементный состав виноматериалов до обработки суспензиями бентонитовых глин и после нее. Установлено, что обработка бентонитовыми глинами привела к изменению концентраций практически всех определяемых элементов в образцах виноматериалов. Во всех образцах виноматериалов после обработки снизились концентрации B, Cu, Zn и увеличились концентрации Ag, Al, Cd, Ni, Na, Sb, Sn, Pb, Ti, Fe. As и Hg не были обнаружены ни в исходных, ни в обработанных образцах виноматериалов. Концентрации As, Cd, Hg, Pb, которые регламентируются в Российской Федерации, во всех обработанных образцах виноматериалов были существенно ниже установленного максимального уровня. Концентрации других элементов – Ag, B, Cu, Na, Zn, Ni, нормируемых в документах ЕС и МОВВ, в исследованных обработанных образцах виноматериалов оказались также значительно ниже нормативов. Таким образом, все исследованные бентонитовые глины могут быть рекомендованы к использованию при производстве вин. The use of suspensions of bentonite clays in the processing of wines in order to clarify and stabilize them has a significant effect on the mineral composition of wines. In this case, wines can be enriched with metals cations, which have a different effect on the quality and persistence of wine. Changes in the elemental composition of wine materials as a result of their treatment with 32 samples of bentonite clays of various brands were studied. The objects of the study were samples of wine materials from grapes of the varieties Cabernet Sauvignon, Merlot and Moldova, collected on the territory of the Krasnodar region in 2019. The methods of ICP-NPP and ICP-MS were used to determine the elemental composition of wine materials before and after treatment with bentonite clay suspensions. It was found that the treatment with bentonite clays led to a change in the concentrations of almost all detectable elements in the samples of wine materials. In all samples of wine materials after treatment, the concentrations of B, Cu, Zn decreased and the concentrations of Ag, Al, Cd, Ni, Na, Sb, Sn, Pb, Ti, Fe. As and Hg were not detected in either the initial or treated samples of wine materials. The concentrations of As, Cd, Hg, Pb, which are regulated in the Russian Federation, in all processed samples of wine materials were significantly lower than the established maximum level. The concentrations of other elements – Ag, B, Cu, Na, Zn, Ni, normalized in the EU and the International Organization of Vine and Wine documents, in the studied processed samples of wine materials were also significantly lower than the standards. Thus, all the studied bentonite clays can be recommended for use in the production of wines.


2004 ◽  
Vol 264-268 ◽  
pp. 1411-1414 ◽  
Author(s):  
E. Günister ◽  
S. İşçi ◽  
N. Öztekin ◽  
N. Güngör ◽  
F.B. Erim

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