Ion-Exchange Properties of Zeolites and Related Materials

Dyer, A.

doi:10.1016/s0167-2991(07)80804-4

Cited by 38 publications

(18 citation statements)

References 104 publications

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“…Thus, we ask whether fluids and glasses sourced directly from alkaline-carbonatite magmas give rise to low-R zeolites, and whether the extraframework cation composition (both major and trace cations) is consistent with this. We also consider cation selectivity as a control on mineral compositions (Dyer 2007). The well-documented cation selectivity series determined for specific zeolite types and indeed, for specific deposits, urge vigilance in interpretation of major and trace element compositions in zeolites that might have undergone progressive stages of reaction involving framework transformation.…”

Section: Rationale and Evidencementioning

confidence: 99%

The masquerade of alkaline–carbonatitic tuffs by zeolites: a new global pathfinder hypothesis

et al. 2011

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Rapid and progressive reaction of alkaline-carbonatitic tuffs with magmatic and crustal fluids disguises their initial character and origin. This is collectively indicated from (a) the extensive literature on zeolite formation from volcanic glass precursors and alkaline fluids, (b) mineralogical characteristics of specific zeolite species, (c) a comparative review of global distributions of alkaline-carbonatite suites and of zeolite minerals, and (d) new trace element data from zeolite samples. A unifying conceptual model based on tectonic and geological settings, hydrological regime and mineralogy is presented that helps to explain the global distributions and current understanding of occurrences. The model will assist in resource exploration by contributing deeper understanding of the economically important bedded zeolite deposits and further, serve as a guide to the discovery of new alkaline-carbonatitic suites, potentially of economic significance (metallic ores and rare earth elements).It follows that future testing of the hypothesis will impact on models of natural carbon cycling as volcanic contributions of CO 2 are reviewed.

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Section: Rationale and Evidencementioning

confidence: 99%

The masquerade of alkaline–carbonatitic tuffs by zeolites: a new global pathfinder hypothesis

et al. 2011

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“…This means that there are more [AlO4] 5-tetrahedral units in its structure, and this creates a high amount of negative charges. Subsequently, this negative charge is neutralized by bounded Na + [26], resulting in large Na+ content detected in the synthetic zeolite, as shown in Table 2. The reported effects of an available alumina in alumina rich pozzolan on the capability of absorbing the reactive phases of the aggregates limited the dissolution of amorphous silica thus restricting ASR expansion [27].…”

Section: Discussionmentioning

confidence: 99%

Effect of Synthetic and Natural Zeolite on ASR Expansion

Sujjavanich¹,

Wongtanasarasin²,

Kongkachuichay³

2017

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Abstract. The cation exchange capability (CEC), pozzolanic reaction, and filling effects are important keys of natural zeolite for mitigation of Alkali Silica Reaction (ASR), but variation of the zeolite's composition is a major problem when it is utilized. This may not be the case for synthetic zeolite. This paper presents the effects of natural and synthetic zeolite on Alkali Silica Reaction's expansion control. The percentage cement replacement of synthetic zeolite A (SZ) were 0.5, 1.0, 1.5, 2.5, 5,7.5, and 10 and ground natural zeolite, clinoptilolite (NZ), were 10 and 20. It was found that the large percentage replacement (10-20%) changed behaviors of fresh and hardened mixtures significantly. Large replacements of SZ (i.e., 7.5 and 10%) significantly reduced workability and compressive strength, and increased expansion. Slight reductions in expansion were found for the use of small percentage replacement (SZ<5.0%). Chemical analysis and strength reactivity index tests revealed the non-pozzolanic properties of synthetic zeolite, but not the ground natural one, NZ. The NZ exhibited both pozzolanic reactivity and the capability to significantly reduce expansion. At 20% replacement of NZ, the expansion significantly reduced to none at 14 days of acceleration and less than 0.02% at the longer duration of 28 days. It was confirmed that the high CEC of the studied synthetic zeolite is not the key factor for the effective mitigation for ASR.

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“…Those that exhibit exchange are a-Al 2 O 3 , a-Al OOH and a-Al (OH) 3 . Both produce more than one hydrous oxide.…”

Section: Hydrous Oxidesmentioning

confidence: 99%