Nucleation and growth history of zeolite LTA synthesized from kaolinite by two different methods

Ríos, Carlos A.; Williams, Craig D.; Fullen, Michael A.

doi:10.1016/j.clay.2008.05.006

Cited by 194 publications

(116 citation statements)

References 29 publications

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“…Metakaolin crystals synthesized by low-temperature method (ML) are aggregates of irregular shape, usually plate-like or scale-like. Similar observations have been described by Youssef et al [29] and Rios et al [30]. The morphology of the tuff obtained after low-temperature synthesis (TL) and metakaolin after fusion synthesis (MF) significantly differed from that of TF and ML.…”

Section: Examination Methods and Equipmentssupporting

confidence: 78%

Characterization of the products obtained from alkaline conversion of tuff and metakaolin

Grela

Łach

Bajda

et al. 2018

J Therm Anal Calorim

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Currently, there has been a growing interest of zeolite materials for industrial and scientific purpose. Synthetic zeolites are more often used than natural ones due to its higher purity and more uniform particle sizes. Numerous investigations are conducted in searching of inexpensive raw materials suitable for zeolite synthesis. Moreover, the temperature, pressure, times and SiO 2 /Al 2 O 3 ratio are the most important parameters which play key roles in the synthesis processes. Due to such a large number of factors that affect the process, zeolite synthesis has been undergoing constant development. Nowadays, researchers focus on the methods of synthesizing zeolites at ambient temperature and pressure. Metakaolin and tuff are natural raw materials which can be turned into a brand new class of synthetic zeolites. However, each requires different method of synthesis in order to obtain a material with best physical properties. This paper discusses the process of alkaline activation of synthetic zeolites from natural raw materials: volcanic tuff excavated in Filipowice and metakaolin obtained from Rominco company. Two methods: fusion and low-temperature synthesis, were used in the presented research. Moreover, the physical properties of raw materials and zeolites obtained were shown. Based on the XRD analysis, it was verified that materials after the synthesis process contained zeolites A, Na-X and faujasite-Na. Furthermore, the dehydration and thermal decomposition phenomena of the tuff and metakaolin before and after the synthesis process were determined by coupled TG/MS techniques.

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Section: Examination Methods and Equipmentssupporting

confidence: 78%

Characterization of the products obtained from alkaline conversion of tuff and metakaolin

Grela

Łach

Bajda

et al. 2018

J Therm Anal Calorim

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“…Pois, a utilização de matérias-primas de baixo custo para sintetizar zeólitas oferece vantagens econômicas sobre padrões químicos sintéticos [14]. Desta forma, diversos grupos de pesquisas têm estudado a preparação de algumas zeólitas a partir de caulins e tem obtido grandes sucessos na síntese principalmente das zeólitas A [15,16], mordenita [17], zeólita X [18,19], zeólita Y [20,21], entre outras.…”

Section: Introductionunclassified

Síntese de zeólita do tipo faujasita a partir de um rejeito de caulim

Hildebrando¹,

Angélica²,

Neves³

et al. 2012

Cerâmica

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ResumoMateriais zeolíticos foram sintetizados utilizando como fonte principal de silício e alumínio um rejeito industrial gerado durante o beneficiamento do caulim para cobertura de papel; o material de partida e as fases formadas como produtos de reação foram caracterizados por difração de raios X, microscopia eletrônica de varredura e espectroscopia de refletância difusa no infravermelho com transformada de Fourier. O processo de síntese ocorreu em condições hidrotermais através de autoclavagem estática e os efeitos tempo-temperatura, assim como também as relações Si/Al e Na/Al foram considerados. Os resultados mostram que na metodologia desenvolvida com o rejeito de caulim, inicialmente calcinado a 700 °C por 2 h, submetido em seguida à reação em meio alcalino a 90 ºC por 48 h na presença de uma fonte adicional de sílica foi obtida zeólita do tipo faujasita com boa cristalinidade como fase predominante no produto de síntese. Palavras-chave: zeólita, faujasita, caulim. AbstractZeolitic materials were synthesized using as main source of silicon and aluminum an industrial waste generated during the processing of kaolin for paper coating, the starting material and formed phases as reaction products were characterized by XRD

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“…Zeolites are thermodynamically metastable [31]. Their nucleation and crystal growth are strongly affected by crystallization temperature and alkali concentration [32,33]. Changes in temperature and alkali concentration will both affect the crystal growth rate and nucleation rate of zeolites.…”

Section: Xrd Analysis Of Alkali-leached Residuementioning

confidence: 99%

Insights into Alkali-Acid Leaching of Sericite: Dissolution Behavior and Mechanism

et al. 2017

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Sericite is a typical silicate impurity in microcrystalline graphite ores, and its removal is important in the preparation of high-purity graphite preparations. Alkali-acid leaching is an effective method used to purify graphite and remove silicate minerals. In this study, the dissolution behavior and mechanism of sericite in alkali-acid leaching were investigated. The dissolution of sericite was mainly affected by alkali leaching temperature, sodium hydroxide concentration, and alkali leaching time. According to the XRD, FTIR, and SEM-EDS analyses, the dissolution mechanism of sericite is a three-stage process: (1) sericite is dissolved in the form of soluble silicate and aluminate; (2) the dissolved silicate and aluminate then react with each other to form aluminosilicate; and (3) finally the aluminosilicate mainly composed of hydroxycancrinite and sodalite is almost completely dissolved in the hydrochloric acid solution.

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Nucleation and growth history of zeolite LTA synthesized from kaolinite by two different methods

Cited by 194 publications

References 29 publications

Characterization of the products obtained from alkaline conversion of tuff and metakaolin

Characterization of the products obtained from alkaline conversion of tuff and metakaolin

Síntese de zeólita do tipo faujasita a partir de um rejeito de caulim

Insights into Alkali-Acid Leaching of Sericite: Dissolution Behavior and Mechanism

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