Zeolitization of perlite

Antonucci, P.L.; Crisafulli, M.L.; Giordano, N.; Burriesci, N.

doi:10.1016/0167-577x(85)90027-8

Cited by 13 publications

(6 citation statements)

References 7 publications

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“…A very important application of raw perlite is its use as a raw material in the synthesis of zeolites [4]. Due to its physical characteristics-uniformity coefficient, hydraulic size, density and porosity, perlite constitutes a good filter material [5].…”

Section: Herskovitch and Ij Linmentioning

confidence: 99%

Upgrading of Raw Perlite by a Dry Magnetic Technique

Herskovitch¹,

Lin²

1996

Magnetic and Electrical Separation

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Perlite of composition SiO2 73.6%, A1203 12.4%, Fe203 1.25%, MgO 0.15%, Na20 2.99%, K20 4.18%, HO + 3.17%, H20-0.2%, and found to contain 89.4% of amorphous phase and 10.6% of crystalline phase, the latter consisting of feldspars, biotite, quartz, magnetite and chlorite, was studied. Due to its largely amorphous nature, chemical composition and melting behaviour, perlite can be used in the manufacture of ceramics. For the glass industry, on the other hand, an impediment, albeit the only one, is the iron content, so that the iron-bearing minerals must be removed, which can be accomplished by dry magnetic separation. Laboratory and pilot-plant separation experiments carried out with these minerals showed that the FeO3 content cannot be reduced to below 0.65% owing to small inclusions of iron-bearing minerals that remain in the other minerals, or in the amorphous particles. Perlite with an FeO3 content below 0.7% and grain size of less than 1 mm can, however, be used in the production of eoloured glass containers.

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Section: Herskovitch and Ij Linmentioning

confidence: 99%

Upgrading of Raw Perlite by a Dry Magnetic Technique

Herskovitch¹,

Lin²

1996

Magnetic and Electrical Separation

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“…Zeolite Na-P is a synthetic mineral which is crystallized hydrothermally from sodium aluminosilicate gels (Barter et al, 1959;Breck, 1974;Barrer, 1982), thermally treated kaolinite, i.e., metakaolinite (Barter, 1982), and various types of natural glasses in the temperature range of 60-160~ (Aiello et al, 1971;Burriesci et al, 1984;Antonucci et al, 1985;Giordano et al, 1987;Barth-Wirsching et al, 1993;Christidis et al, 1999). The synthetic zeolites produced from natural glasses have variable purity depending on the composition of the starting materials (Breck, 1983).…”

Section: Introductionmentioning

confidence: 99%

Ion Exchange of Zeolite Na-P_c with Pb²⁺, Zn²⁺, and Ni²⁺ Ions

Moirou

Vaxevanidou

Christidis

et al. 2000

Clays and clay miner.

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Abstract--This paper examines the ion-exchange properties of synthetic zeolite Na-P0, which was produced from perlite-waste fines and has a SiO2:A1203 ratio of 4.45:1 and a cation-exchange capacity (CEC) of 3.95 meq g ~. Although equilibrium is attained rapidly for all three metals, exchange is incomplete, with At(max) (maximum equilibrium fraction of the metal in the zeolite) being 0.95 for Pb, 0.76 for Zn, and 0.27 for Ni. In both Na ~ 89 and Na --* 89 exchange, the normalized selectivity coefficient is virtually constant for :~A~ (normalized equilibrium fraction of the metal in the zeolite) values of --<0.6, suggesting a pronounced homogeneity of the available exchange sites. The Gibbs standard free energy, AG ~ of the Na ---) 89 exchange calculated from the normalized selectivity coefficient is -3.11 kJ eq and, for the Na ~ 1/2Zn exchange, it is 2.75 kJ eq ~.Examination of the solid exchange products with X-ray diffraction (XRD) revealed a possible decrease in crystallinity of zeolite Pb-Pc as suggested by the significant broadening and disappearance of diffraction lines. This decrease is associated with a reduction of pore opening, as indicated from Fourier-transform infrared analysis (FTIR), which in turn results in a decrease of the amount of zeolitic water. Thermogravimetric-differential thermogravimetric (TG-DTG) analysis showed that water loss occurs in three steps, the relative significance of which depends on the type of exchangeable cation and subsequently on the type of complex formed with the cation and/or the zeolite channels. Zeolite Na-P c might be utilized in environmental applications, such as the treatment of acid-mine drainage and electroplating effluents.

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“…Synthetic zeolites can be produced from a variety of natural silica-rich materials including acidic volcanic glasses [1], such as natural and expanded perlite and pumice [2][3][4][5][6][7][8][9]. Although the synthesis of zeolites from volcanic glasses provides the opportunity for upgrading of mineral resources, which are either not exploited or are utilized in other industrial applications, it usually yields zeolitic end products with variable purity [10].…”

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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Zeolitization of perlite

Cited by 13 publications

References 7 publications

Upgrading of Raw Perlite by a Dry Magnetic Technique

Upgrading of Raw Perlite by a Dry Magnetic Technique

Ion Exchange of Zeolite Na-P_c with Pb²⁺, Zn²⁺, and Ni²⁺ Ions

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

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Zeolitization of perlite

Cited by 13 publications

References 7 publications

Upgrading of Raw Perlite by a Dry Magnetic Technique

Upgrading of Raw Perlite by a Dry Magnetic Technique

Ion Exchange of Zeolite Na-Pc with Pb2+, Zn2+, and Ni2+ Ions

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

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Ion Exchange of Zeolite Na-P_c with Pb²⁺, Zn²⁺, and Ni²⁺ Ions