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    Copper, Zinc And Nickel’s Removal By Bentonite Clay: Case Study In Mono And Multicomponent Systems
    (Université M'Hamed Bougara Boumerdes, 2019) Hamdache, F.; Chergui, A.; Halet, Farid; Yeddou, A.R.
    The main purpose of this work is the Copper, Zinc and Nickel’s removal from mono and multi-metal ions aqueous solution using an Algerian bentonite without treatment. The bentonite is characterized using SEM, XRD and X-ray fluorescence. The effect of initial pH and contact time are studied. Under mono and multicomponent systems, the kinetic studies performed at pH 5, indicate that the adsorption follows a pseudo second order model. For both systems, the isotherm data are well correlated with Langmuir model. Whereas the maximum adsorption capacities follow the sequence’s order Cu > Zn > Ni. In the case of multicomponent system, the Cu(II), Zn(II) and Ni(II) adsorptions capacities (58.82, 19.53 and 6.56 mg/g) are lower than the obtained ones for the monocomponent system (58.48, 49.02 and 31.74 mg/g). In addition to that, a mutual competitive effect is observed. Zn(II) and Ni(II) ions adsorption is also inhibited by Cu(II) ions with no change in the maximum Cu(II) adsorption capacity.
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    Effects of poly-sal polymer and barite addition on rheological properties of algerian bentonite
    (EBSCOHOST, 2021) BacHir belmahdi, ilyes; Malek, Abderrahmane; Hammadi, Larbi
    In this paper, we investigate the effect of Poly-Sal polymer and barite on the rheological properties of bentonite of Maghnia (western Algeria). The modified Cross model is used to fit the stationary flow curves of bentonite at different concentrations of Poly-Sal add in base bentonite (4%) and the generalized model of Kelvin-Voigt is successfully applied to fit the creep and recovery data and to analyze the viscoelastic properties of the mixture Bentonite-Barite. Finally, the thixotropic behavior studied of the mixture Bentonite-Barite at constant temperature is analyzed by using a structural kinetic model (SKM) in order to account for the time dependent effect. It is demonstrated that the increase in quantity of barite in base bentonite induces a restructuring and reorganization of the particles of the bentonite at the microstructural level.
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    Valorization of mixed metal hydroxide on Algerian Na-Bentonitesuspensions: Application to water-based drilling fluid
    (Elsevier, 2020) Akkouche, A.; Benmounah, A.; Gueciouer, A.; Chalah, K.
    The use of mixed metal hydroxide tri-cationic (Li+,Mg+2,Al+3) in water based drilling fluids brought to thebirth of a new air and perspective to improve the using of Bentonitic suspension as viscosifier in drillingfluids.The aim of this work is to study the possibility of using mixed metal hydroxide and see his effect atdifferent percent (5%, 10%, 15% and 20% by Wt of Bentonite) on the rheological behavior and colloidalproperties of Algerian Na-Bentonite suspension (30 kg/m3).Rheological tests and Zeta Potential measurements have been performed for each prepared suspension.The results show that the adding of MMH on Algerian Na-Bentonite increases the yield stress to 1.39 Pasat 20% MMH, however a stable suspension was observed 41 mV of Zeta Potential measurement at 10%MMH with yield stress of 1.17 Pas.
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    Rheological study of concentrated dispersions. Application to the drilling fluid
    (Institute of Physics Publishing, 2018) Ouaer, Hocine; Gareche, Mourad; Allal, Ahmed
    In order to understand the rheological behavior of concentrated aqueous Algerian bentonite dispersions of drilling (sodium bentonite of Mostaganem "m'zila"), rheological tests were carried out. By varying the concentration of bentonite, flow tests have allowed to estimate the yield stress and apparent viscosity for each concentration and to see their influence on the rheological behavior of these dispersions. In addition dynamic tests (oscillatory) are used to define the linear region of our samples, the state of our fluid (elastic solid or viscous liquid) and understanding the mechanisms of structuring of the particles constituting the material. In parallel, other tests coupled with rheological measurements such as x-rays diffraction to know the mineralogical composition and granulometry to estimate the bentonite particle size.
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    Synthesis and characterization of Ag-oxide pillar /composite clay mineral used as adsorbent
    (World Research Association, 2018) Cherifi-Naci, Halima
    The purpose of our study is the evaluation clay extracted from western Algeria's land. The experimental study consists to designate the optimal activation conditions (concentration: 3 M at temperature T = 70 ° C, activation time = 4h, adsorbed H2SO4 = 1.45 meq / g clay, CEC = 52 meq/100 g clay) to obtain an adequate activated bentonite which is ready for pillaring operation. Modified clay was characterized by different techniques XRD, XRF and physico-chemical analysis (cation exchange capacity; CEC, specific surface area; SBET). Silver pillared material was synthesized from activated bentonite at 3 M/T=70°C using the AgNO3 solution as pillaring agent. Silver pillar clay was characterized by physicochemical analysis (XRD, CEC, surface acidity, specific surface area, average pore diameter and density). The basal spacing for the intercalated bentonites with silver pillar is respectively in 39.5 A° and 37 A°. The specific surfaces of silver pillared clay and natural bentonite are respectively in 370 and 65 m2 g-1 order. These fundamental results are very important in the development of the new adsorbent.
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    Rheological behavior of cement-based grout with Algerian bentonite
    (Springer Nature, 2019) Benyounes, Khaled
    he rheological parameters, yield stress, flow index, consistency, and plastic viscosity of cement grouts are important parameters for the quality control of these materials. These parameters are assessed from the rheogram using a rheo-logical model. Cement slurries without additive indicated a non-Newtonian type of rheological behaviour with yield stress. On the other hand, the mixtures containing a viscosifying agent exhibit a shear-thinning rheological behaviour which is much more important than the mixtures without a viscosifying agent. In this work, we formulated non-hydrated Algerian bentonite cement slurry in the presence of a superplasticizer. Cement was replaced cement by bentonite in five different substitution rates (2%, 4%, 6%, 8%, and 10%) and the water/binder ratio was fixed at 0.5. For this, various rheological tests were realized by using a controlled stress rheometer. In order to show the influence of bentonite on the rheological behaviour of the different grouts, several flow tests were carried out for a range of shear rates between 0.01 and 200 s−1. To properly adjust the different rheograms, various rheological models were used such as the models of Bingham, Herschel–Bulkley, modified Bingham, Casson, De Kee, Vom Berg, Yahia and Papanastasiou. For the correct choice of the rheological model, it was based on the calculation of the standard error. It was found that the rheological models of Herschel–Bulkley and Papanastasiou made it possible to better describe the flow curves compared to the other rheological models. It has been found that as the content of bentonite increases, the yield stress and the consistency evolve drastically, by cons the flow index decreases progressively
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    Rheological studies and optimization of Herschel–Bulkley parameters of an environmentally friendly drilling fluid using genetic algorithm
    (Springer, 2018) Ouaer, Hocine; Gareche, Mourad; Rooki, Reza
    The Herschel–Bulkley rheological parameters of an environmentally friendly drilling fluid formulated based on an Algerianbentonite and two polymers—hydroxyethyl cellulose and polyethylene glycol—have been optimized using a genetic algorithm.The effect of hydroxyethyl cellulose, temperature, pH and sodium chloride (NaCl) on the three-parameter Herschel-Bulkleymodel was also studied. The genetic algorithm technique provided improved rheological parameter characterization compared tothe nonlinear regression, especially in the case of drilling fluids formulated with sodium chloride making it a better choice.Furthermore, the oscillatory test offered more reliable yield stress values. The rheological parameters were found to be verysensitive to different conditions. Yield stress and consistency index increased with increasing the hydroxyethyl cellulose con-centration, reaching maximum at a temperature of 65 °C and decreased with decreasing pH and also when adding sodiumchloride to the drilling fluid. The flow index changed inversely to yield stress and consistency index. The physical origins of thesechanges in rheological parameters were discussed and correlation between variation in rheological parameters and bentonitesuspension properties were concluded. Based on these results, it is recommended to use the proposed formulation of drilling fluidat high temperature and when the formation of alkaline pH is encountered due to the gelation mechanism and to select theoptimum concentration of NaCl to avoid degradation of the rheological parameters
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