This kaolin was heat-treated to assure the total transformation of the kaolin into metakaolin. The geopolymerization process was carried out at room temperature. And the SiO 2 /Al 2 O 3, SiO 2 + Al 2 O 3 /Na 2 O, and Na 2 O/H 2 O ratios were varied using a mixture design approach to correlate the mechanical strength and structural evolution ...
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In the present study, the effect of the type and concentration of an activator on the structure and properties of alkali-activated metakaolin, and metahalloysite was assessed. These two different...
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In this study, a sodalite-type zeolite (SOD) was synthesized through the alkaline fusion of kaolin and crystallized under ambient pressure conditions, without the need for autoclaves and high temperatures. The inuence of the ratio between fused kaolin and water (g/mL) during crystallization was evaluated.
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Preparation and Characterization of Acid and Alkaline Treated Kaolin Clay. Kaolin was refluxed with HNO 3, HCl, H 3 PO 4, CH 3 COOH, and NaOH of 3M concentration at 110 °C for 4 hours followed by calcination at 550 °C for 2 hours. The physico-chemical characteristics of resulted leached kaolinite clay were studied by XRF, XRD, FTIR, TGA ...
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Kaolin, PP-kaolin (PPE-adsorbed kaolin), and PPE were thoroughly combined by constant stirring in distilled water solution containing 10 % wt. of PVOH to make homogenous mixture. To make nanocomposites films for experiments, the homogenous mixture is poured into a Petri dish and dried in a hot air oven at 80 °C.
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Kaolin and alkali activator were mixed with the solids-to-liquid ratios in range of 0.60–1.20 (Al 2 O 3 /Na 2 O molar ratio of 0.63–1.27). Sodium silicate and sodium hydroxide …
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The product of the alkaline liquefaction of kaolin taken up by water exhibits the reaction properties of alkaline aluminates and alkaline silicates. 4. TESTS
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When alkaline activator 0.5% compared to 1.5% of an alkaline activator sulfate, they get more weight loss. The result shows more alkaline activator, less porosity, higher strength, durability ...
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The invention discloses a high-alkaline kaolin clay. According to the high-alkaline kaolin clay provided by the invention, the high-alkaline kaolin clay comprises: 40%-50% of kaolin clay, 15%-20% of silicon dioxide, 5%-10% of aluminium oxide, 5%-15% of limestone, 1%-3% of boric acid, and the balance being impurities. Advantage of the high-alkaline kaolin clay disclosed by the …
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In this work, the leaching behaviour of six aluminosilicate industrial minerals and by-products (kaolin, metakaolin, fly ash, natural pozzolana from Milos, zeolite and furnace slag) in alkaline solutions is investigated. The variables studied are the kind of alkali metal (K, Na), the concentration of the alkaline solution (2.5, 5 and 10 M) and the time of dissolution (5, 10 and …
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Kaolin and alkali activator were mixed with the solids-to-liquid ratios in range of 0.60–1.20 (Al 2 O 3 /Na 2 O molar ratio of 0.63–1.27). Sodium silicate and sodium hydroxide ranged between 0.16 and 0.36 (SiO 2 /Na 2 O molar ratio of 3.19–3.67) were mixed together to prepare alkali activator. The results concluded that compressive strength was affected by both …
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A modified mixture of SASR and kaolin was used as the basic component for synthesizing cost-effective zeolite using the alkaline fusion-hydrothermal method for the removal of heavy metal ions from ...
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Kaolin is a naturally occurring clay that is treated for impurities. Uses. Adsorbant. Uses. kaolin (China clay) is a mixture of various aluminum silicates. It is often used in powders and masks given its absorbent, abrasive, bulking, and opacifying properties.
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Kaolin is a name given to a group of phyllosilicate minerals whose layers have a 1 : 1 structure with a composition of Al 2 Si 2 O 5 (OH) 4.The 1 : 1 designation indicates the individual layers are composed of sheets of corner sharing tetrahedra in a distorted hexagonal arrangement and a sheet of edge sharing octahedra.
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kaolin and acid, alkaline treated kaolin is shown in . table 4. Lower a cidity of KNaOH can be explained . due to the neutralization of acid sites formed due . to leaching by the strong alkali NaOH.
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Kaolin was refluxed with HNO3, HCl, H3PO4, CH3COOH, and NaOH of 3M concentration at 110 °C for 4 hours followed by calcination at 550 °C for 2 hours. The physico-chemical characteristics of resulted leached kaolinite …
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Geopolymers were synthesized using thermally activated natural kaolin (metakaolin) with sodium-based alkaline (NaOH and Na 2 SiO 3) and phosphoric acid (H 3 PO 4) activation methods, with a focus on the effect of varying Liquid-to-Solid (L/S) ratios (0.5, 0.6, 0.7, and 0.8). Raw materials and geopolymers were characterized by X-ray fluorescence ...
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and the procedure reported by R. Cheary and A. Coelho (1992) for the kaolin raw material. Potassium hydroxide (KOH) powder with 85% purity was employed for the alkali activation of the kaolins. Table 1. Characteristics of the kaolin raw materials composition (mass %) Kaolin clay A Kaolin clay B Chemical Mineralogical Chemical Mineralogical SiO
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Alkaline-activated kaolin and CKD will contribute to the long-term strengthening of the in-situ bottom liner. The high cation exchange capacity (CEC) of the zeolitic tuff allows it to absorb contaminants from the leachate. The combination of alkali-activated kaolin, zeolitic tuff, and CKD results in the formation of a sustainable, lowcost ...
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The advantage of using F-MK over MK in pre-treating kaolin is that it enables complete breakdown of the kaolinite structure and also promotes dry reactions of other thermally stable mineral phases, such as quartz and muscovite, that are …
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raw kaolin characteristics to obtain alkaline cementi-tious materials with high mechanical properties. The objective of this work is to relate different MK reactivity upon high alkaline solutions with the charac-teristics of raw kaolins. 2. Experimental Inthepresentwork,twospanishkaolinsfromGuadala-jara (C1) and Tudela (C2) were used. Table …
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The properties of Enugu kaolin were modified by thermal and alkaline hydrothermal means. The raw and modified kaolin samples were characterized using Brunauer-Emmett-Teller nitrogen adsorption surface area analysis, X-ray fluorescence, X-ray diffraction, Fourier-transform infrared spectroscopy and Scanning electron microscopy techniques.
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Kaolin was refluxed with HNO 3, HCl, H 3 PO 4, CH 3 COOH, and NaOH of 3M concentration at 110 °C for 4 hours followed by calcination at 550 °C for 2 hours. The physico-chemical characteristics of resulted leached kaolinite clay were studied by XRF, XRD, FTIR, TGA, DTA, SEM and N 2 adsorption techniques. XRF and FTIR study indicate that acid treatment under …
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The product of the alkaline liquefaction of kaolin taken up by water exhibits the reaction properties of alkaline aluminates and alkaline silicates. 4. TESTS 4.1. Consistency Mix 1 g of kaolin with 1ml of water. The resulting paste should not be runny. 4.2. Water Loss at 700 °C
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A pure, stoichiometric kaolin and the derived metakaolin calcined in a rotary kiln at 800 ˚C were characterized by XRF, XRD, DSC/TG and PSD. Geopolymeric pastes activated …
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Kaolin is an aluminosilicate precursor, which is rich in alumina (Al 2 O 3) and silica (SiO 2), it is widely distributed in southern Jordan, which makes them excellent precursors for development of alkali-activated binders, it is also available in commercial quantities and is considered as a main economic resource in Jordan [28].Furthermore, kaolin is abundantly …
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For the study of this influence, a complete characterization of two spanish kaolins used to synthesised the material has been carried out. A JAF conduction calorimeter was used to …
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Kaolinite, Al 2 [Si 2 O 5](OH) 4, is the main phase of the kaolin group of clay minerals.The kaolinite crystal structure is composed of a plane of SiO 4 tetrahedra linked by oxygen atoms parallel to a plane of AlO 2 (OH) 4 octahedra as shown in Fig. 1 (Brindley and Nakahira, 1959; Barrer et al., 1968).It is formed when anhydrous aluminosilicate found in rock …
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The mineralogical characteristics of alkaline kaolin deposits in the Ural Region are given. Assumption are made with respect to the possibility of using this kaolin in fine ceramics production.
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transformation into alkaline kaolin determines the chemical and mineralogical composition of the latter. The chemical composition of the studied alkaline kao-lins is given in Table 601. The ...
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Zeolites can be obtained in the process of the alkali-activation of aluminosilicate precursors. Such zeolite–geopolymer hybrid bulk materials merge the advantageous properties of both zeolites and geopolymers. In the present study, the effect of the type and concentration of an activator on the structure and properties of alkali-activated metakaolin, and metahalloysite was assessed. …
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Reaction mechanism of geopolymerisation with metal kaolinite process [8,11].Sodium hydroxide (NaOH) and sodium silicate (Na 2 SiO 3, water glass) are used as alkaline activators to activate geopolymers.NaOH dissolves aluminosilicate, while Na 2 SiO 3 supports NaOH as a binder, plasticiser, or dispersant [].Based on preliminary laboratory work, it was shown that NaOH …
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Color range: Kaolin (white to cream), Bentonite (various earth tones) Water Retention and Agriculture. Kaolin clay plays a role in agriculture, primarily as a protective coating for plants. It reflects excess sunlight and heat, reducing plant stress in hot conditions. The kaolin clay benefits in this context include improved crop quality and yield.
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Alkaline-activated kaolin and CKD will contribute to the long-term strengthening of the in-situ bottom liner. The high cation exchange capacity (CEC) of the zeolitic tuff allows it to absorb contaminants from the leachate. The combination of alkali-activated kaolin, zeolitic tuff, and CKD results in the formation of a sustainable, low-cost ...
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Cement paste was firstly made by alkaline activation of calcined kaolin with alkali activator (mixture of 6–10 M NaOH and Na2SiO3 solution), heated in oven at temperature of 80 °C forming a ...
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The solids obtained by acid treatments are promising as adsorbents and catalyst supports, while treatment in alkaline conditions may be a good method for preparing K−F zeolite.
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In the Fig. 8 (a), a schematic representation of the simulated HA-Kaolin water is shown where the HA represents the humic acid molecules, K represents the Kaolin particles and HA-K represents Humic acid-kaolin complex that are formed as a result of interaction between humic acid and kaolin particles which may occur before or after adsorption on ...
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Alkaline aging significantly affects Mn(II) adsorption capacity of polypropylene microplastics in water environments: Critical roles of natural organic matter and colloidal particles ... An important suggestion was that in complicated adsorption-reactor system, great numbers of microplastics-kaolin heteroaggregates might be formed via ion ...
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