A new approach for the fabrication of porous alumina beads using acid leachate of kaolin

Yadav, Amit Kumar; Bhattacharyya, Sunipa

doi:10.1016/j.micromeso.2019.109795

Cited by 13 publications

(4 citation statements)

References 32 publications

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“…The obtained results are consistent with the data [32][33][34] regarding the obtained microspheres Al 2 O3, e.g., granule size, powder/acid ratio (AlOOH:HNO 3 ), and strength of granules. Moreover, these results are consistent with the data of the References [35,36], where the dataset regarding the pore sizes and the specific surface area of the granules is given.…”

Section: Discussionsupporting

confidence: 90%

Experimental Studies and Condition Monitoring of Auxiliary Processes in the Production of Al2O3 by Sol–Gel Technology

et al. 2022

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Powders and granules of heavy metal oxides produced through condition monitoring are in high demand as intermediate products for obtaining fine-grained ceramics for a wide range of applications, i.e., nuclear fuel and fuel elements for nuclear power plants. Sol–gel technology to produce nuclear fuel (UO2), as well as catalysts (ThO2) for organic synthesis in the form of granules from pressed microspheres, is a promising method to obtain powders and granules of heavy metal oxides (fine-graded ceramics). Al2O3 was selected as the model analog at the stages of obtaining a solution of heavy metal and sol, the formation and gelation of droplets, and the preparation of gel spheres and their further washing and drying, as well as recovery and firing of particles. In the study, the main parameters were substantiated, e.g., the diameter and angle of inclination of the axis for the holes in the perforated shell, the multiplicity of sol circulation before the holes, the coefficients of liquid (sol) flow rate, the oscillation frequency of the disperser, and the concentration of surfactant and acid in sol. All of these parameters affect the characteristics of the granules that are obtained by sol–gel technology. Moreover, recommendations to increase productivity and the energy efficiency of production were also given. In particular, it was found that oscillation frequency in a range of 70–80 Hz leads to a granulometric composition of the obtained granules of 2.0–2.2 mm. A hole of 0.85 mm and a frequency of 100 Hz slightly change this range to 1.2–2.0 mm, while maintaining monodispersity.

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Section: Discussionsupporting

confidence: 90%

Experimental Studies and Condition Monitoring of Auxiliary Processes in the Production of Al2O3 by Sol–Gel Technology

et al. 2022

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“…It can be concluded that the sample contains Fe2O3 with a fairly high level. The high content of Fe2O3 in this clay is similar to the sample used in the study before (Yadav and Bhattacharyya 2020) which uses clay in the form of kaolin, has a fairly high content of Fe2O3 and TiO2.…”

Section: Resultssupporting

confidence: 66%

The Effect of Acid Treatment on Metal Oxide Content of South Sulawesi Natural Clay

Side,

Putri

2022

IJFS

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Abstract. This study investigated the effect of adding acid on the metal oxide content of natural clay in Gowa Regency, South Sulawesi Province. The acid solutions used were sulfuric acid (H2SO4), hydrochloric acid (HCl), and nitric acid (HNO3) with a concentration of 3 M. The characterization of metal oxide content was carried out using XRF and morphological analysis of natural clay using SEM. The results showed that the impurity metal oxide content decreased after being treated with acid. The largest mass percent of silica alumina occurred in the HCl 3 M treatment with alumina mass percent of 20.27% and silica of 25.41%. The clay morphology looks different after being treated with acid for all types of acid solutions. The results of this study are expected to become recommendations for further research related to natural clay pretreatment both as a ceramic base material and as a catalyst support.

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“…The metal oxide content of natural clay before and after acid treatment was analyzed using XRF; the results obtained are shown in Table 1. Fe2O3 in this clay is similar to the sample used in the previous study (Yadav & Bhattacharyya, 2020), which uses clay in the form of kaolin and has a relatively high content of Fe2O3 and TiO2. The high content of Fe2O3 and TiO2 in natural clay is supported by data from mineral analysis using XRD (which will be discussed in the next session).…”

Section: Analysis Of Metal Oxide Using Xrfsupporting

confidence: 63%

Characterization of Natural Clay from Gowa Regency, South Sulawesi Province, Indonesia

Side

Putri

2022

J. Akademika Kimia

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Clay is one of the essential natural minerals in human life, especially in the industrial sector, which is widely used as a raw material for ceramics fabrication, adsorbents, and photocatalysts. The characteristics of clay significantly affect the quality of the resulting material. This study will study the aspects of natural clay in Gowa Regency, South Sulawesi Province, without the leaching process and with acid leaching. Acid leaching uses 3 M HCl, previously roasted at a temperature of 600 oC. The characterization consisted of metal oxide analysis using XRF, mineral content analysis using XRD, morphological analysis, and compound content using SEM-EDX. The results showed that the primary metal oxide content in natural clay was Fe2O3, Al2O3, and SiO2, the content of Fe2O3 decreased after the raw clay was treated with acid. The main mineral content in the sample is quartz, kaolinite, and hematite. The sample's morphology looks different after being given acid treatment; the acid leaching natural clay sample shows a porous morphology, while the natural clay without acid leaching shows the morphology in the form of lumps. The EDX mapping analysis showed that the number of impurities decreased after being given acid treatment.

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A new approach for the fabrication of porous alumina beads using acid leachate of kaolin

Cited by 13 publications

References 32 publications

Experimental Studies and Condition Monitoring of Auxiliary Processes in the Production of Al2O3 by Sol–Gel Technology

Experimental Studies and Condition Monitoring of Auxiliary Processes in the Production of Al2O3 by Sol–Gel Technology

The Effect of Acid Treatment on Metal Oxide Content of South Sulawesi Natural Clay

Characterization of Natural Clay from Gowa Regency, South Sulawesi Province, Indonesia

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