Hydrothermal synthesis of pollucite, analcime and their solid solutions and analysis of their properties

Jing, Zhenzi; Cai, Kunchuan; Li, Yan; Fan, Junjie; Zhang, Yi; Miao, Jiajun; Chen, Yuqian; Jin, Fangming

doi:10.1016/j.jnucmat.2017.03.008

Cited by 27 publications

(8 citation statements)

References 18 publications

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“…This fact allows to explain that the Cs/Al ratio in the extraction liquor is not a limiting parameter for the crystallinity of the final solids. Jing et al [13] also found that crystalline pollucite was not obtained with a Si/Al molar ratio lower than 1.5 at temperatures lower than 200 °C. Thus, Si/Al ratio of 2 and a curing temperature of 200 °C were selected for the syntheses.…”

Section: Componentmentioning

confidence: 99%

“…and POL (ICDD 25-194) were prepared from the extraction liquors. Jing et al [13] concluded that the Cs/Al ratio in the starting mixture had no significant effect on the crystallinity. This fact allows to explain that the Cs/Al ratio in the extraction liquor is not a limiting parameter for the crystallinity of the final solids.…”

Section: Componentmentioning

confidence: 99%

“…The PXRD patters of analcime and pollucite zeolites are very similar to each other. Both belong to the analcime family and have very similar structures; in fact, pollucite-analcime solid solutions with different Cs/Na ratios exist in Nature [13]. The ionic diameter of Cs + (3.34 Å) [14,15] is larger than that of Na + (2.04 Å) [15]; and Cs + occupies in POL sites which are occupied by H2O molecules in ANA.…”

Section: Componentmentioning

confidence: 99%

“…Analcime (ANA) and Pollucite (POL) are zeolites belonging to the analcime family and their structures are similar [13]. The diameter of channels in pollucite is 2.80 Å [14] while the diameter of Cs + is 3.34 Å [14,15] and Cs + is immobilized inside the pollucite structure, pollucite being a very interesting material for storing 137 Cs in a safe way [11][12][13]. Analcime could be used as an ion exchanger.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Pollucite and Analcime Zeolites as a Method to Valorize Aluminum Saline Slags

Jiménez

Misol

Morato

et al. 2021

Proceedings of the 2nd International Electronic Conference on Mineral Science

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In this work, a valorization procedure is developed for the wastes generated during aluminum recycling, namely, for saline slag. The procedure is divided into two steps: 1) recovery of aluminum from various slag fractions, and b) the use of recovered aluminum in the synthesis of two zeolites, namely, analcime (NaAlSi2O6•H2O) and pollucite (CsAlSi2O6•nH2O). Saline slag was ground, sieved (1 mm), washed and separated into two fractions of different sizes, larger or lower than 0.4 mm. The fraction < 0.4 mm was treated under reflux conditions with NaOH or CsOH solutions of different concentrations. The extraction liquor contained aluminum and alkali metal cations and allowed to obtain the zeolitic materials by hydrothermal synthesis at 200 °C for 24 hours after adding the necessary amount of Si. These solids were fully characterized. The results of the first step showed that a high percentage of Al (~44 wt.%) in the fraction < 0.4 mm, can be recovered.The results of the second step indicated that crystalline analcime and pollucite zeolites can be hydrothermally synthesized from extraction liquors and a source of Si, the zeolites being the only phases detected by powder X-ray diffraction.

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Section: Componentmentioning

confidence: 99%

Section: Componentmentioning

confidence: 99%

Section: Componentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Preparation of Pollucite and Analcime Zeolites as a Method to Valorize Aluminum Saline Slags

Jiménez

Misol

Morato

et al. 2021

Proceedings of the 2nd International Electronic Conference on Mineral Science

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“…The XRD analysis software identified some peaks in the raw sample as pollucite (shown in Figure 4 as x). Given that pollucite is a zeolite material that is not normally naturally occurring, we suspect it may be an isomer such as analcime with Na rather than Cs [31]. Figure 4 shows the crystallographic structures present in powdered samples and the relative impact of the activation treatments on demineralization of the semi-coke samples.…”

Section: Impact Of Activation On Semi-cokementioning

confidence: 99%

Experimental and Computational Demonstration of a Low-Temperature Waste to By-Product Conversion of U.S. Oil Shale Semi-Coke to a Flue Gas Sorbent

et al. 2018

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The volatility of crude oil prices incentivizes the use of domestic alternative fossil fuel sources such as oil shale. For ex situ oil shale retorting to be economically and environmentally viable, we must convert the copious amounts of semi-coke waste to an environmentally benign, useable by-product. Using acid and acid + base treatments, we increased the surface area of the semi-coke samples from 15 m2/g (pyrolyzed semi-coke) to upwards of 150 m2/g for hydrochloric acid washed semi-coke. This enhancement in porosity and surface area is accomplished without high temperature treatment, which lowers the overall energy required for such a conversion. XRD analysis confirms that chemical treatments removed the majority of dolomite while retaining other carbonate minerals and maintaining carbon contents of approximately 10%, which is greater than many fly ashes that are commonly used as sorbent materials. SO2 gas adsorption isotherm analysis determined that a double HCl treatment of semi-coke produces sorbents for flue gas treatment with higher SO2 capacities than commonly used fly ash adsorbents. Computational fluid dynamics modeling indicates that the sorbent material could be used in a fixed bed reactor to efficiently remove SO2 from the gas stream.

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Introduction to Archean Rare-Metal Pegmatites

Dittrich

Seifert

Schulz

et al. 2019

SpringerBriefs in World Mineral Deposits

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Hydrothermal synthesis of pollucite, analcime and their solid solutions and analysis of their properties

Cited by 27 publications

References 18 publications

Preparation of Pollucite and Analcime Zeolites as a Method to Valorize Aluminum Saline Slags

Preparation of Pollucite and Analcime Zeolites as a Method to Valorize Aluminum Saline Slags

Experimental and Computational Demonstration of a Low-Temperature Waste to By-Product Conversion of U.S. Oil Shale Semi-Coke to a Flue Gas Sorbent

Introduction to Archean Rare-Metal Pegmatites

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