Síntese de zeólita tipo NaA a partir de caulim para obtenção de zeólita 5A através de troca iônica

Melo, Carolina Resmini; Riella, Humberto Gracher

doi:10.1590/s0366-69132010000400005

Cited by 15 publications

(9 citation statements)

References 4 publications

(3 reference statements)

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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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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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“…The quartz crystals were not broken at the heat treatment at 1200 ºC due to the fact that the melting temperature of this compound is higher than 1600 ºC [43]. Other studies have also identified the presence of quartz crystals when analysed the X-ray diffraction of other pozzolans, such as metakaolin [44] and fly ash [45].…”

Section: Htospw Characterizationmentioning

confidence: 99%

Assessment of the pozzolanic activity of ornamental stone waste after heat treatment and its effect on the mechanical properties of concretes

Mittri

Degen

Vieira

et al. 2018

Rev. IBRACON Estrut. Mater.

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This paper aims at evaluating the pozzolanic properties of ornamental stone processing waste after heat treatment at 1200 °C (HTOSPW) and analyzing the influence on the mechanical strength of concrete produced with HTOSPW addition at the contents of 5% and 10% by mass of Portland cement. The HTOSPW shows promising results regarding the pozzolanic activity, revealing chemical and physical characteristics typical of pozzolanic materials in addition to being approved in the pozzolanicity tests performed. As for the concretes produced with HTOSPW addition, a significant increase in mechanical strength was observed, especially for concretes with a 10% addition.

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“…Thus, due to this structure, zeolites, natural or synthesized in laboratories, are capable of optimizing chemical processes, for example, gas purification, ion exchange in detergents, and the treatment of domestic and industrial effluents, as well as in animal nutrition, in medicine, and in agriculture, among others. In particular, the zeolite of the faujasite (FAU) type (X and Y) is used in the processes of catalytic cracking and adsorption by the petroleum industry 16 .…”

Section: Introductionmentioning

confidence: 99%

Study of the Thermal Stability of Faujasite Zeolite Synthesized from Kaolin Waste from the Amazon

2019

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The waste from the processing of kaolin in the Amazonian region of Brazil was subjected to a calcination process at 700°C for 2 h to obtain metakaolin, which, together with sodium hydroxide and sodium silicate, formed the reaction mixture. This mixture was subjected to an aging step (24 h at 60 rpm), and a subsequent hydrothermal process at 110°C for 10 h. By means of X-ray diffraction (XRD), differential thermal and thermogravimetric analysis (DTA/TG) and scanning electron microscopy (SEM) techniques, the crystallization of a single phase, faujasite (FAU) zeolite, was observed. In the postsynthesis process, it was verified by means of XRD that the thermal stability of this structure persists up to a temperature of 600°C. At 800°C, the structure of FAU collapses. Beginning at 850°C, new nepheline phases are formed, and at 1000°C, nepheline and mullite phases are formed.

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Síntese de zeólita tipo NaA a partir de caulim para obtenção de zeólita 5A através de troca iônica

Cited by 15 publications

References 4 publications

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

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

Assessment of the pozzolanic activity of ornamental stone waste after heat treatment and its effect on the mechanical properties of concretes

Study of the Thermal Stability of Faujasite Zeolite Synthesized from Kaolin Waste from the Amazon

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