Extraction of silica and alumina from coal fly ash for the synthesis of zeolites

Kamarudin, Rose A.; Matlob, Abdul Salam; Jubri, Zaemah; Ramli, Zainab

doi:10.1109/iceenviron.2009.5398608

Cited by 14 publications

(10 citation statements)

References 17 publications

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“…Silica is widely applied in various applications because silica has unique characteristics such as low density, low thermal conductivity, high surface area, and high specific strength [7]. Some applications of silica are the main ingredients of the glass and ceramic industries [8], raw material for solar cells [9], pozzolanic materials [3], cement mixture [10], silica in nanocomposite bioactive materials was applied to bone tissue repair [11], nano-silica is used by industries related to the production of pigments, ISSN: 2252-8814  pharmaceuticals [12], photocatalyst support [13], catalyst [14], filler material for polymer material modification [15], adsorbent of industrial waste [16], [17], adsorbent of plant nutrients [18], zeolite synthesis material [19], [20], and as a matrix in the immune-affinity column [21]. In addition, silica is used in the coating industry as a corrosion inhibitor [22], in the food industry and anti-fungus agents [23], and used in blood analysis [24].…”

Section: Introductionmentioning

confidence: 99%

Silica extract from Malang beach sand via leaching and sol-gel methods

Sumari

Asrori

Prakasa

et al. 2023

IJAAS

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Many silica minerals are found in beach sands. One of its beach sands is in Bajul Mati beach sand which contains high silica. The silica can be extracted using existing methods, but it is less environmentally friendly. In this research, the extracting process of silica from the sand of Bajul Mati beach (South of Java-Indonesia) has been carried out through a method that is low-cost and more environmentally friendly. The purpose of this study was to characterize extracted silica with instrumentation results and economic analysis. The method of extracting silica from beach sand was via leaching and sol-gel methods: i) leaching with 7M HCl,ii) the formation of clear sodium silicate solution (Na2O.SiO2),iii) sol-gel: sodium silicate solution titrated with oxalic acid (H2C2O4) 1 M until pH 6 was obtained and silicite Si(OH)4 was formed, and iv) characterization with X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and scanning electron microscopy (SEM) with economic analysis. The result showed that extracted silica has a cristobalite structure based on XRD analysis. The purity of silica (% Wt Si) reached 93.9% based on XRF analysis. FTIR analysis has identified silanol, siloxic, and siloxane groups. The SEM analysis shows that silica (SiO2) particles tend to form agglomerations about ∼1 μm. In addition, economic analysis results showed that this method will support implementation in the future, so silica has been produced by this developed method.

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Section: Introductionmentioning

confidence: 99%

Silica extract from Malang beach sand via leaching and sol-gel methods

Sumari

Asrori

Prakasa

et al. 2023

IJAAS

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show abstract

“…Silica (SiO2) is widely used in various applications because silica has unique characteristics such as low density, low thermal conductivity, high surface area, and high specific strength [9]. Some uses of silica are the main ingredients of the glass and ceramic industries [10], raw material for making solar cells [11], pozzolanic materials [5], cement mixture [12], silica in nanocomposite bioactive materials was applied to bone tissue repair [13], nano-order silica is used by industries related to the production of pigments, pharmaceuticals [14], photocatalyst support [15], catalyst [16], filler material for polymer material modification [17], [18], adsorbent of industrial waste [19]- [25], adsorbent of plant nutrients [26], zeolite synthesis material [27]- [30], and as a matrix in the immune-affinity column [31]. In addition, silica is used in the pharmaceutical and catalyst industries, in the coating industry for corrosion prevention [32], in the food industry and anti-fungus agents [33], used in blood analysis [34], etc.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Silica Extracted from Malang Beach Sand Via Leaching and Sol-Gel Methods

Sumari

Asrori

Prakasa

et al. 2022

Preprint

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Many silica minerals are found in beach sand. One of its beaches is in Bajul Mati beach sand which contains high silica. The silica can be extracted using existing methods, but it is less environmentally friendly. In this research, the extracting process of silica from the sand of Bajul Mati beach (south of Java-Indonesia) has been carried out through a method that is low cost and more environmentally friendly. The study aims to characterize extracted silica with instrumentation results, and economic analysis. The method of extracting silica from beach sand via leaching and sol-gel methods: (1) leaching with 7 M HCl (2) the formation of clear sodium silicate solution (Na2O.xSiO2); (3) sol-gel: sodium silicate solution titrated with oxalic acid (H2C2O4) 1 M until pH 6 was obtained and silicite Si(OH)4 was formed; and 4) characterization with XRF, XRD, FTIR, and SEM with economic analysis. The result showed that extracted silica has a cristobalite structure based on XRD analysis. The purity of silica (% Wt Si) reached 93.9% based on XRF analysis. FTIR analysis has identified silanol, siloxic, and siloxane groups. The SEM analysis shows that SiO2 particles tend to form agglomerations at about ∼1 μm. In addition, economic analysis results showed that this method would support implementation in the future, so silica has been produced by this advanced method.

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“…Silica extraction methods have varied from year to year over the last ten years. In general, silica extraction is carried out by researchers to be used as material for zeolite synthesis (Cornelius, 2019;Kamarudin et al, 2009;Matlob et al, 2012;Moreno et al, 2002). The most recent is its use as nano-silica, which can be used as a material for making catalysts and membranes (Aphane et al, 2019;Miricioiu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

The Comparison Effect of NaOH and KOH as The Leaching Solution for Silica from Two Different Coal Fly Ashes

Hanum

Rahayu

Hapsauqi

2022

Indo. J. Chem. Res.

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One of the environmental problems is the waste from the coal combustion process from coal power plants or other industries that use coal as an energy source. The combustion process produces coal fly ash, which will accumulate in the environment. Subsequently, much research about the utilization of coal fly ash has been developed. Silica extraction from coal fly ash is one of the methods that can be used to utilize coal fly ash. This study carried out silica extraction using the Direct Alkaline Leaching (DAL) method. The coal ash was contacted with alkaline solvents (KOH and NaOH) with the variations of concentrations and the leaching time. The leaching solution filtrate will be precipitated with the addition of HCl. The characteristics of this silica from CFA and CFA B were analyzed by using Scanning Electron Microscopy (SEM). Based on the results, it could be known that each of the coal fly ashes has different results for both alkaline solvents. CFA A has relatively less silica extraction results in both types of solvents. Meanwhile, CFA B gave higher silica extraction results with coal fly ash and solvent contact time for one hour.

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Extraction of silica and alumina from coal fly ash for the synthesis of zeolites

Cited by 14 publications

References 17 publications

Silica extract from Malang beach sand via leaching and sol-gel methods

Silica extract from Malang beach sand via leaching and sol-gel methods

Characterization of Silica Extracted from Malang Beach Sand Via Leaching and Sol-Gel Methods

The Comparison Effect of NaOH and KOH as The Leaching Solution for Silica from Two Different Coal Fly Ashes

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