Zeolite Formation from Synthetic and Natural Glasses

Aiello, R.; Colella, C.; Sersale, R.

doi:10.1021/ba-1971-0101.ch004

Cited by 21 publications

(8 citation statements)

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“…Note that the mineral analcime can be formed from a hydrogel in the presence of excess (100%‐300%) NaOH over the amount of Al 2 O 3 present in the gel; however, the mineral stability fields for analcime and other zeolites are temperature‐dependent . Thus, acceleration of leaching using temperatures above the known stability field of a given mineral may not provide the correct phase assemblages on HLW glass surfaces.…”

Section: Discussionmentioning

confidence: 99%

“…For resumption glasses, excess alkali in the hydrogel and in the leachate along with Si * /Al * ≥1 act together to crystallize zeolites in the same manner that zeolites are made industrially (see Section 1.2): via the reaction of hydrogels with excess caustic. 32,53 Note that the mineral analcime can be formed from a hydrogel in the presence of excess (100%-300%) NaOH over the amount of Al 2 O 3 present in the gel; 32,54 however, the mineral stability fields for analcime and other zeolites are temperature-dependent. 53,55 Thus, acceleration of leaching using temperatures above the known stability field of a given mineral may not provide the correct phase assemblages on HLW glass surfaces.…”

Section: Discussionmentioning

confidence: 99%

“…Zeolites from synthetic sodic rich glasses with variable SiO 2 /Al 2 O 3 or Na 2 O/Al 2 O 3 and natural analog glasses have been studied in excess NaOH and found to form Zeoite A, Na-P zeolite, analcime, basic sodalite and/or faujasite. 32,54 For Na 2 OÁAl 2 O 3 ÁnSiO 2 hydrogels where (2<n<10) in the presence of NaOH, KOH, or LiOH, the type of zeolite that forms is dependent on the temperature (60-390°C), the amount of excess NaOH, KOH, or LiOH, the counter ion present (Na, K, Li, Ca, etc. ), and the reaction time.…”

Section: Appendix 1 Tutorial On Zeolitization In Industrial Applicatimentioning

confidence: 99%

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Accelerated Leach Testing of Glass (ALTGLASS): II. Mineralization of hydrogels by leachate strong bases

Jantzen

Trivelpiece

Crawford

et al. 2017

Int J of Appl Glass Sci

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The durability of high level nuclear waste glasses must be predicted on geological time scales. Waste glass surfaces form hydrogels when in contact with water for varying test durations. As the glass hydrogels age, some exhibit an undesirable resumption of dissolution at long times while others exhibit near steady‐state dissolution, that is, nonresumption of dissolution. Resumption of dissolution is associated with the formation of zeolitic phases while nonresumption of dissolution is associated with the formation of clay minerals. Hydrogels with a stoichiometry close to that of imogolite, (Al2O3·Si(OH)4), with ferrihydrite (Fe2O3·0.5H2O), have been shown to be associated with waste glasses that resume dissolution. Aluminosilicate hydrogels with a stoichiometry of allophane‐hisingerite ((Al,Fe)2O3·1.3‐2Si(OH)4) have been shown to be associated with waste glasses that exhibit near steady‐state dissolution at long times. These phases are all amorphous and poorly crystalline and are also found on natural weathered basalt glasses. Interaction of these hydrogels with excess alkali and OH− (strong base) in the leachates, causes the Al2O3·nSiO2 (where n=1‐2) hydrogels to mineralize to zeolites. Excess alkali in the leachate is generated by alkali in the glass. Preliminary rate‐determining leach layer forming exchange reactions are hypothesized based on these findings.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Appendix 1 Tutorial On Zeolitization In Industrial Applicatimentioning

confidence: 99%

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Accelerated Leach Testing of Glass (ALTGLASS): II. Mineralization of hydrogels by leachate strong bases

Jantzen

Trivelpiece

Crawford

et al. 2017

Int J of Appl Glass Sci

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“…Previous studies have confirmed the efficacy of synthetic zeolites as a modifying agent for cement and lime dry mixes [9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 95%

Use of the Additive Based on Amorphous Silica-Alumina in the Adhesive Dry Mixes

Vi¹,

Cv²

2017

J Material Sci Eng

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This article proves the possibility of using amorphous aluminosilicate as a modifying additive for the adhesive dry mixes. The data is given on the microstructure and chemical composition of the amorphous aluminosilicates. This article described the character changes in the rheological properties of cement-sand mortar, depending on the percentage of additives. The model of cement stone strength using synthetic additives in the formulation is illustrated. The results of physical and mechanical properties of tile adhesive made on the basis of the developed adhesive dry mix formulations are described.

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“…Although pure FAU-type zeolite X has been synthesized from natural volcanic materials, pure zeolite Y, which is also a FAU-type zeolite, has not been synthesized quantitatively from natural materials yet. Previous attempts to synthesize zeolite Y yielded reaction products with zeolite Y contents lower than 50% [11][12]. Nevertheless, zeolite Y is easily synthesized from SiO 2 -Al 2 O 3 gels prepared from pure chemical reagents, with/without addition of seeds and/or organic molecules, which act as templates in the crystallization process ( [2,13,14] and references therein).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of FAU Type Zeolite Y from Natural Raw Materials: Hydrothermal SiO2-Sinter and Perlite Glass

Christidis¹,

Papantoni²

2008

TOMJ

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The first synthesis of pure FAU-type zeolite Y from a SiO 2-sinter and perlite glass is presented. FAU-type Zeolite Y was synthesized at 95 ± 2°C after 6-12 hours using gels having SiO 2 :Al 2 O 3 :Na 2 O molar ratios of 8.4:1:4.2 and using gels with SiO 2 :Al 2 O 3 :Na 2 O molar ratios of 10.5:1:4.2 between 48 and 120 hours reaction time. Except for zeolite Y, zeolite NaP c , gmelinite-Na and the OH-analogue of sodalite were produced from starting gels with different composition. The cation exchange capacity of zeolite Y was 3.3 meq.g-1 and its specific surface area was 520-550 m 2 .g-1. Most of the specific surface area is allocated to micropores. Zeolite Y synthesized from gels with a SiO 2 :Al 2 O 3 molar ratio of 10.5:1 has a lattice parameter parameter a o = 24.747 Å and a Si/Al ratio 2:1. It is concluded that inexpensive raw materials such as volcanic glasses can be used for the production of high added value zeolite Y.

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Zeolite Formation from Synthetic and Natural Glasses

Cited by 21 publications

References 0 publications

Accelerated Leach Testing of Glass (ALTGLASS): II. Mineralization of hydrogels by leachate strong bases

Accelerated Leach Testing of Glass (ALTGLASS): II. Mineralization of hydrogels by leachate strong bases

Use of the Additive Based on Amorphous Silica-Alumina in the Adhesive Dry Mixes

Synthesis of FAU Type Zeolite Y from Natural Raw Materials: Hydrothermal SiO2-Sinter and Perlite Glass

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