Colloidal stability of bentonite clay considering surface …
At the higher ionic strength of 0.1 M NaClO 4, the zeta potentials were increased and their values were around zero for the whole pH range. Thus, it can be concluded that the bentonite colloids are stable at the lower ionic strengths of 0.01 and 0.001 M NaClO 4 but unstable at the higher ionic strength of 0.1 M NaClO 4 for the whole pH range ...
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Sorption of Th(IV) on MX-80 bentonite: effect of pH and …
bentonite was studied as a function of pH and ionic strength in the presence and absence of humic acid/fulvic acid. The results indicate that the sorption of Th(IV) on MX-80 ben-tonite increases from 0 to 95% at pH range of 0–4, and then maintains high level with increasing pH values. The sorp-
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Effect of pH on Rheological and Filtration
Figure 6 shows the changes in the YP/PV ratio over a wide range of pH for the bentonite-based mud. The highest value of YP/PV is 1.4 for pH of 8 and the ratio was 1.0 for pH values of [9,10] and it decreased to 0.5 for pH of 11 and 12. The results for YP/PV ratios show that for increasing pH values, there is a decreasing in the ratio of YP/PV ...
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Science and Composition of Bentonite Powder
5. pH. Bentonite typically has a neutral to slightly alkaline pH. This pH can be influenced by the source of the bentonite and the presence of other minerals. Its pH level …
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Zinc adsorption in bentonite clay: influence of pH and …
Thus the adsorption should be made in a pH range > pHzpc, in this case pH > 5.3 for the calcined clay. The objective was to maximize the removal of zinc ions from an aqueous solution, considering that
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The API standard test and analysis values of mud parameters
A development which shows that the activated bentonitic clays' pH values were within the API bentonite pH value range as indicated in Table 1 ...
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(PDF) pH Impact on Bentonite-Based Drilling Fluid …
Sustainability 2019, 11, 6714 8 of 13 Figure 6 shows the changes in the YP/PV ratio over a wide range of pH for the bentonite-based mud. The highest value of YP/PV is 1.4 for pH of 8 and the ratio was 1.0 for pH values of [9,10] and it decreased to 0.5 for pH of 11 and 12. The results for YP/PV ratios show that for increasing pH values, there ...
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Combined determination analysis of surface properties evolution …
Other parameters, in addition to surface potential, can be used to characterize the surface electrochemical properties of bentonite as pH changes in a moderate range. Fig. 3 shows the measured surface electric field strength, specific surface area, and surface charge numbers at various pH levels. In a moderate pH range, the surface electric ...
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Heavy metal retention properties of kaolin and bentonite …
Request PDF | On Nov 1, 2015, Xianfeng Liu and others published Heavy metal retention properties of kaolin and bentonite in a wide range of concentration and different pH conditions | Find, read ...
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Building the bridge between U(VI) and Ca-bentonite
The speciation and binding mechanisms of U(VI) on clay or bentonite (or its main component montmorillonite) are well investigated in acidic, neutral and slightly alkaline background electrolytes but studies in the hyperalkaline pH range (>10) are rare (Kautenburger et al., 2019; Philipp et al., 2019).
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Degradation of hydroxypropyl guar gum at wide pH range …
In this paper, five bentonite-supported zero-valent metal catalysts were prepared for catalytic degradation of HPGG solution so as to achieve the purpose of polymer wastewater treatment at wide pH range. The results showed that the bentonite-supported zero-valent copper exhibited high catalytic performance reflected by a large absolute ...
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Surface chemistry and rheological properties of API …
API bentonite, a key ingredient of drilling muds, displayed a negative zeta potential across the whole pH range of 2.5–12.3. It contained two very rheological active ingredients, …
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Heavy metal retention properties of kaolin and bentonite …
This experimental study aims to characterize the HM retention capacity on two typical clays (kaolin and bentonite) over a wide range of HM concentrations varying from 0.1 mM up to 100 mM, with emphasis on pH effect under different pH conditions.
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4 Important Bentonite Test for Piling
A pH of around 7.0 is considered neutral, lower than 7.0 is acidic, and higher than 7.0 is alkaline. The suitable range of pH values for pile boring work is 9.5-12.0. It is a swift and effective …
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Effect of pH and electrolyte on the rheology of aqueous …
The influence of pH between 7.5 and 10.5, for 5% and 6.42% aqueous Wyoming bentonite dispersions and of NaCl for 2%, 5% and 6.42% of Wyoming-bentonite in water for a range of salt concentrations up to 1.0 M has been investigated.
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Effect of pH on Rheological and Filtration Properties of …
water-based drilling fluid based on bentonite in the range of 9 to 10 as it provides the optimum mud rheological and filtration properties. The findings of this study illustrated that keeping the pH in the range of 9 to 10 will reduce the plastic viscosity that will help in increasing the rate of penetration and
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SODIUM BICARBONATE
SODIUM BICARBONATE is used to lower the pH of drilling fluid slurries from a pH of 12 – 13 (alkaline) to a neutral pH range of 8 – 9. SODIUM BICARBONATE can be added to a base drilling fluid as a pH neutralizing additive. SODIUM BICARBONATE is also used as a buffer when added to acidic water to raise the pH to 8 – 9.
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Bentonite
An early study (Armstrong & Chesters, 1964) investigated the effect of pH on the desorption of pepsin from bentonite. In this study, 62.8% of the pepsin (pI 2.8), which had been adsorbed onto the bentonite at pH 3.0, was desorbed by raising the pH to 5.2 using sodium hydroxide although his method is not sustainable in a winery setting.
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A surface chemical model of the bentonite-water …
bentonite range from pH = 7.1 - 8.4 depending on the stage of conversion of Na-bentonite to Ca-bentonite. The corresponding pH range for Äspö groundwater is pH = 6.0 - 6.5.
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Effect of pH on Rheological Properties of Purified Sodium Bentonite
The effect of pH on the rheological behavior of three purified sodium bentonite (HP, GP, and WP) suspensions is studied. Each clay is studied as a function of pH, at a chosen constant concentration. ... To obtain a large range of pH values, HCl or NaOH solutions are used in the preparation of the suspensions. From the natural pH and when pH ...
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(PDF) Effect of pH on Rheological and Filtration Properties of …
Sustainability 2019, 11, 6714 8 of 13 Figure 6 shows the changes in the YP/PV ratio over a wide range of pH for the bentonite-based mud. The highest value of YP/PV is 1.4 for pH of 8 and the ratio was 1.0 for pH values of [9,10] and it decreased to 0.5 for pH of 11 and 12. The results for YP/PV ratios show that for increasing pH values, there ...
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A novel layer-layer crossed structure of bentonite/g-C3N4 …
Request PDF | A novel layer-layer crossed structure of bentonite/g-C3N4 for enhanced photocatalytic oxidation of arsenic(III) in a wide pH range | In this work, a novel 2-dimentional (2D)-2D ...
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Range of Rheological Properties for Bentonite Drilling …
Range of Rheological Properties for Bentonite Drilling Muds Ahmed S. Mohammed and C. Vipulanandan Ph.D., P.E. and D. Richardson3 Center for Innovative Grouting Material and Technology (CIGMAT) Department of Civil and Environmental Engineering University of Houston, Houston, Texas 77204-4003
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Effect of pH on Rheological Properties of Purified Sodium Bentonite
The effect of pH on the rheological behavior of three purified sodium bentonite (HP, GP, and WP) suspensions is studied. Each clay is studied as a function of pH, at a chosen constant concentration.
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Sorption of Th(IV) on MX-80 bentonite: effect of pH and …
MX-80 bentonite was characterized by XRD and FTIR in detail. The sorption of Th(IV) on MX-80 bentonite was studied as a function of pH and ionic strength in the presence and absence of humic acid/fulvic acid. The results indicate that the sorption of Th(IV) on MX-80 bentonite increases from 0 to 95% at pH range of 0–4, and then maintains high level with …
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Bentonite and getting the most out of it.
Bentonite yields best in fresh water with a pH between 8.5 to 9.5. It is common that normal tap water is used and this often has a neutral pH of around 7. While bentonite will still yield at this neutral pH, it is best to raise the …
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Effects of bentonite concentration and solution pH on the …
The influences of bentonite concentration and solution pH on the rheological properties and long-term stabilities of bentonite suspensions were studied in this research. Rheological properties were measured at bentonite concentrations of 5, 7, and 9 wt.%. It was found that the viscosity and shear stress increased with increasing bentonite concentration and …
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Bentonites
Natural calcium bentonites have a neutral pH (level around 6.5 to 8.5) whereas activated calcium bentonites have a much more alkaline pH (level around 8.5 to 10.0). Natural sodium bentonites …
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The Purpose of Drilling Fluid Additives and How They Work
Adding soda ash to water is an easy way to raise pH levels to that desired range, helping attain optional product hydration/yield. Bentonite. A staple of almost all HDD drilling fluid mixes, bentonite helps create higher viscosity downhole, provides some gel strength for flushing cuttings and creates a filter cake to help reduce fluid lost into ...
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AGRI-FLEX™
Small amounts of AGRI-FLEX bentonite feed addtive will create tougher, more durable pellets with improved flowability and reduced lumping and caking. ... AGRI-FLEX is stable over a wide range of pH and temperatures. G.R.A.S. AGRI-FLEX is Generally Recognized As Safe by the FDA. Ready to take the next step? Talk to a Bentonite Performance ...
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