Metallurgical characterization of kaolin from Atacama, Chile

Rivera, O.G.; Pavez, Osvaldo; Kao, Julia Li; Nazer, Amin

doi:10.1590/0370-44672016690005

Cited by 10 publications

(7 citation statements)

References 3 publications

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“…The agglomerated particles have irregular shapes and uneven sizes. Similar morphology for Chilean kaolin has been reported before . The surface of NC is rough and contains numerous interparticle cavities (Figure a).…”

Section: Resultssupporting

confidence: 85%

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Removal of Hazardous Contaminants from Water by Natural and Zwitterionic Surfactant-modified Clay

2020

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In this study, natural clay (NC) was collected from Saudi Arabia and modified by cocamidopropyl betaine (CAPB) at different conditions (CAPB concentration, reaction time, and reaction temperature). NC and modified clay (CAPB-NC) were characterized using X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, and N2 adsorption at 77 K. The adsorption efficiency of NC and CAPB-NC toward Pb2+ and reactive yellow 160 dye (RY160) was evaluated. The adsorption process was optimized in terms of solution initial pH and adsorbent dosage. Finally, the adsorption kinetics and isotherms were studied. The results indicated that NC consists of agglomerated nonporous particles composed of quartz and kaolinite. CAPB modification reduced the specific surface area and introduced new functional groups by adsorbing on the NC surface. The concentration of CAPB affects the adsorption of RY160 tremendously; the optimum concentration was 2 times the cation exchange capacity of NC. The equilibrium adsorption capacity of CAPB-NC toward RY160 was about 6 times that of NC and was similar for Pb2+. The adsorption process followed the pseudo-second-order kinetics for both adsorptive. RY160 adsorption on CAPB-NC occurs via multilayer formation while Pb2+ adsorption on NC occurs via monolayer formation..

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Section: Resultssupporting

confidence: 85%

“…Similar morphology for Chilean kaolin has been reported before. 35 The surface of NC is rough and contains numerous interparticle cavities (Figure 3a). Such surface is favorable for adsorption because of the predicted high surface area and ease of pollutant diffusion through cavities.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Removal of Hazardous Contaminants from Water by Natural and Zwitterionic Surfactant-modified Clay

2020

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“…The raw kaolin, Figure 3 (a) validate the clay particles of the layered silicates in the form of books tells that the particles are not fully dispersed into individual layers [49,50]. From the raw kaolin, clear layered rectangular shapes observed an indication that natural kaolinite, without any treatment, is double layer alumino-silicate clay [51]. Besides, adsorptive and porosity nature on the surface is observed and formed a complex structure for beneficiated and calcined kaolin.…”

Section: Surface Morphology Examination Using Semmentioning

confidence: 93%

Synthesis and characterization of Ethiopian kaolin for the removal of basic yellow (BY 28) dye from aqueous solution as a potential adsorbent

Aragaw

Angerasa

2020

Heliyon

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In the present research, the kaolin adsorbents (beneficiated, raw powder, and calcined) were prepared from Ethiopian natural kaolin through mechanical, wet, and thermal processes. The geochemical and surface properties of kaolin adsorbent were characterized using FTIR, SEM/EDS, XRD, and XRF. In the batch experiment, basic operation parameters (initial dye concentrations, pH, temperature, contact time, and adsorbent dosage) were examined. Percentage removal efficiency basic yellow 28 (BY28) dye were recorded as 94.79%, 92.08%, and 87.08% onto beneficiated, raw, and calcined kaolin absorbents, respectively at an initial dye concentration of 20 mg/L, solution pH of 9, the temperature of 30 C C, and contact time of 60 min and adsorbent dosage of 1g/ 100L. The molar ratio of SiO 2 /Al 2 O 3 was recorded as 2.911 Percent mass composition of Ethiopian kaolin which is higher than the expected pure kaolinite standard which allows us to classify the kaolin clay as a siliceous one. The calculated values of ΔG 0 for beneficiated adsorbent are-1.243, 1.576, and 4.396 kJ/mol at 303.15, 323.15, and 343.15 K, respectively for 20 mg/L of dye concentration and solution pH of 9, suggests that the thermodynamic behavior at lowest temperature is more feasible and spontaneous as compared with the higher temperature one. A similar fashion was calculated for raw and calcined adsorbents. The negative values of ΔH o and ΔS suggest that the adsorption phenomenon is exothermic and the adsorbate molecules are organized on the solid phase in a more disordered fashion than the liquid phase. The pseudo-first-order and pseudo-second-order models have been used to describe the kinetics in the adsorption processes. The Pseudo-second-order model has been fitted for the BY 28 dye adsorption in the studied concentration range. The adsorption of BY 28 dye for raw and calcined adsorbents follows the Langmuir isotherm and the Freundlich isotherm fitted for the beneficiated adsorbent. The amount of BY28 dye taken up by beneficiated, raw, and calcined kaolin adsorbents was found as 1.896, 1.842, and 1.742 mg/g, respectively at a contact time of 1.0 h, the adsorbent dosage of 1.0 g, initial dye concentration ¼ 20 mg/L and solution pH ¼ 9 at 30 C. The results found that these raw and prepared local kaolin adsorbents have a capacity as low-cost alternatives for the removal of dyes in industrial wastewater.

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“…Kaolin is a mineral widely used in different industries, among which the ceramics industry is highlighted, which uses it for the manufacture of a wide variety of products, such as tableware, sanitary ware, stoneware, tiles, electrical porcelain, ornamental ceramics and refractory (Rivera et al, 2016). Also, kaolin is a widespread source of aluminum, whose aluminum mass content is between 10-20%.…”

Section: Metalurgia E Materiaismentioning

confidence: 99%

Hydrometallurgical extraction of Al and Si from kaolinitic clays

et al. 2017

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Herein is presented the results of a study on the hydrometallurgic extraction and recovery of aluminum and silicon by leaching of kaolinitic clays with HF. The studied extraction parameters were: temperature, reaction time, solid/liquid ratio, concentration, and precipitating agent mass. In the leaching process, mineral dissolutions near 100% were obtained when working at 348 K, solid/liquid ratio 2% w/v, HF 12% v/v, for 120 minutes. The HF leach liquor generated from the dissolution of kaolinitic clays contains H 2 SiF 6 and H 3 AlF 6 . Studies were conducted to recover the two valuable fluorides as K 2 SiF 6 and Na 3 AlF 6 by precipitation with alkaline salts from the leach liquor. Phases of precipitated fluorides were identified by XRD and surface morphology by SEM. The purity of the K 2 SiF 6 precipitate was 98.8%, whereas for Na 3 AlF 6 , it was 89.3%. Also, both synthesized solids are of high commercial value due to their industrial applications.

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Metallurgical characterization of kaolin from Atacama, Chile

Cited by 10 publications

References 3 publications

Removal of Hazardous Contaminants from Water by Natural and Zwitterionic Surfactant-modified Clay

Removal of Hazardous Contaminants from Water by Natural and Zwitterionic Surfactant-modified Clay

Synthesis and characterization of Ethiopian kaolin for the removal of basic yellow (BY 28) dye from aqueous solution as a potential adsorbent

Hydrometallurgical extraction of Al and Si from kaolinitic clays

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