Alkali Fusion of Waste Perlite Dust to Synthesize Faujasite Zeolite Using a Rotary Kiln

Wajima, Takaaki; Onishi, Seiki

doi:10.18178/ijcea.2019.10.6.766

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…As effective utilization methods of waste stone powder, conversion from it to zeolite is one of the candidates. In our previous studies, we successfully converted hardly soluble oxides, such as quartz (SiO2), in waste stone powder, into highly soluble powder by alkali fusion treatment with NaOH at 400 °C to synthesize zeolitic materials [12][13][14], and implemented a large-scale continuous conversion of waste powder into fused materials with high solubility using a rotary kiln from which faujasite zeolite-X can be synthesized [15,16].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of X- and A-Type Zeolites from Waste Stone Powder and Aluminium Dross Using Alkali Fusion

Wajima

2021

MSF

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Zeolites A and X, well-known as practical materials, were successfully synthesized with high cation exchange capacity (CEC) using two industrial wastes, waste crushed stone powder and aluminum dross, by alkali fusion treatment. Waste stone powder and aluminum dross are industrial wastes, and effective utilization of these wastes has been highly expected. Since the main components of the two wastes are Si, Al and O, those wastes can be used as starting materials for synthesis of zeolites. In this study, these industrial wastes were converted into crystalline zeolite-X and –A using alkali fusion. The stone powder, dross and the mixture of these wastes were transformed into a soluble phase via alkali fusion, and then agitated in distilled water at room temperature to give an intermediate gel-like solid, followed by synthesis at 80 °C to give the final product. The zeolites were successfully synthesized via the alkali fusion process, and selective synthesis of zeolites A and X was achieved by controlling the mixing ratio of aluminium dross to stone powder.

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Section: Introductionmentioning

confidence: 99%

Synthesis of X- and A-Type Zeolites from Waste Stone Powder and Aluminium Dross Using Alkali Fusion

Wajima

2021

MSF

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“…Considering that CO 2 capture is the most expensive step in the CCS process, the use of low-cost silicon and aluminum sources is necessary to obtain inexpensive zeolites with high CO 2 -adsorption capacity (Khaleque et al 2020). In this sense, several raw materials have been proposed such as blast furnace slag (Sugano et al 2005), rice husk ash (Mohamed et al 2015;Saceda et al 2011), paper sludge ash (Mun and Ahn 2001), coal fly ash (Amoni et al 2019), waste of iron mine tailings (Zhang and Li 2018), waste glass materials (Tsujiguchi et al 2014) or minerals and rocks such as obsidian (Belviso 2016;Mamedova 2016), perlite (Filho et al 2018;Wajima and Onishi 2019) or clay minerals (Abdullahi et al 2017;Belviso et al 2017;Johnson and Arshad 2014;Mackinnon et al 2010;Youssef et al 2008). In the present research, several phyllosilicates (kaolinite, montmorillonite, saponite, sepiolite and palygorskite) have been used as starting materials for the synthesis of zeolites through the alkaline fusion method (Belviso et al 2017;Chen et al 2014;Khalifa et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Zeolites synthesis from phyllosilicates and their performance for CO2 adsorption

Essih,

Vilarrasa-García,

Azevedo

et al. 2024

Environ Sci Pollut Res

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Five phyllosilicates (kaolinite, montmorillonite, saponite, sepiolite and palygorskite) have been selected as starting materials for the synthesis of zeolites. Among them, kaolinite and montmorillonite display the lowest Si/Al molar ratio leading to aluminosilicates with high crystallinity. Thus, the hydrothermal treatment under basic conditions forms 4A zeolite when kaolinite is used as starting material while 13X zeolite is obtained when montmorillonite is used as starting material. The microporosity and CO2-adsorption capacity of the prepared zeolites are directly related to its crystallinity. Thus, in order to improve it, raw phyllosilicates were subjected to a microwave-assisted treatment to remove undesired Mg or Fe-species, which have a negative effect in the assembling of the zeolites by hydrothermal basic conditions in a second step. The highest adsorption value was 3.85 mmol/g at 25 °C and 760 mm of Hg for Mont-A-B sample after the consecutive treatments.

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“…1618) Additionally, we implemented a large-scale continuous conversion of stone dust into fused materials with high solubility using a rotary kiln from which faujasite zeolite can be synthesized. 19,20) Therefore, there is a possibility to convert the dross into mostly soluble fused material at lower than 400°C using NaOH to synthesize high-value added zeolitic material, especially zeolite-A with low Si/Al molar ratio, indicating high cation exchange capacity (CEC). However, little information can be available on the alkali fusion of aluminium dross with NaOH, the removal of hazardous gases, and the synthesis of zeolite from the dross fused with NaOH.…”

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confidence: 99%

A Novel Process for Recycling of Aluminum Dross Using Alkali Fusion

Wajima

2020

Mater. Trans.

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Aluminum dross discharged from an aluminum production factory can react with water and emit hazardous gases such as hydrogen and ammonia causing serious environmental pollution. Thus, it becomes necessary to recycle the by-products to avoid such problems. In this study, the feasibility of the alkali fusion process to convert the dross into benign and functional material was investigated. The effects of fusion temperature, dross/NaOH ratio, and the heating time on the amount of gas removed from the dross and the soluble contents of Si and Al in the fused dross were examined. Synthesis of zeoliteA from the fused dross was performed by reacting with sodium silicate. The optimum condition to dissolve the minerals Al and Si and maximize the generation of gases was a fusion temperature of 400°C, the ratio of the raw dross to NaOH of 1.0, and the heating time of 3 h. The fused dross can be converted into zeolite-A product with a high cation exchange capacity (3.22 mmol•g ¹1 ) by reacting with sodium silicate solution while generating as much gas as that generated in distilled water. These results demonstrate the applicability of the alkali fusion process to recycle the aluminum dross waste generated from an aluminum industry into valueadded material, thus contributing to the circular economy while reducing the environmental impact.

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Alkali Fusion of Waste Perlite Dust to Synthesize Faujasite Zeolite Using a Rotary Kiln

Cited by 5 publications

References 4 publications

Synthesis of X- and A-Type Zeolites from Waste Stone Powder and Aluminium Dross Using Alkali Fusion

Synthesis of X- and A-Type Zeolites from Waste Stone Powder and Aluminium Dross Using Alkali Fusion

Zeolites synthesis from phyllosilicates and their performance for CO2 adsorption

A Novel Process for Recycling of Aluminum Dross Using Alkali Fusion

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