Chemical, mineralogical and structural features of native and expanded perlite from Macedonia

Reka, Arianit A.; Pavlovski, Blagoj; Lisichkov, Kiril; Jashari, Ahmed; Boev, Blažo; Boev, Ivan; Lazarova, Maja; Eskizeybek, Volkan; Oral, Ayhan; Makreski, Petre

doi:10.4154/gc.2019.18

Cited by 40 publications

(23 citation statements)

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“…1.6%). Compared to Macedonian perlite [ 48 ], which is considered rich in K 2 O and Na 2 O oxides (4.21% and 3.56%, respectively), Slovak and Hungarian perlite in particular has an even higher K 2 O content, even above 8%, in the case of the medium fraction (SP2) and above 7%—the smallest fraction (SP1).…”

Section: Resultsmentioning

confidence: 99%

“…In turn, the publication [ 19 ] showed that Greek perlite consists mainly of silicate glass (amorphous) and additives in the form of biotite, quartz, and feldspar. In the case of Macedonian perlite [ 48 ], XRD analysis showed the presence of a large amount of aluminosilicate amorphous and small amounts of crystalline, represented mainly by feldspar, quartz, and cristobalite. Feldspar is represented as K-plagioclase, Na-feldspar, and microcline.…”

Section: Resultsmentioning

confidence: 99%

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Dehydroxylation of Perlite and Vermiculite: Impact on Improving the Knock-Out Properties of Moulding and Core Sand with an Inorganic Binder

et al. 2021

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The article presents the results of research aimed at examining the type of swelling material introduced into moulding or core sand to improve their knock-out properties. Tests on Slovak perlite ore (three grain sizes), Hungarian perlite ore and ground vermiculite (South Africa) were carried out. For this purpose, thermal and structural analyses (FTIR—Fourier Transform Infrared Spectroscopy), a chemical composition test (XRF-X-Ray Fluorescence), phase analysis (XRD—X-Ray Diffraction), and scanning electron microscopy (SEM—Scanning Electron Microscope) as well as final strength tests of moulding sands with the addition of perlite ore and vermiculite were carried out. The results of thermal studies were related to IR (Infrared Spectroscopy) spectra and XRD diffractograms. It has been shown that the water content in the pearlite ore is almost three times lower than in vermiculite, but the process of its removal is different. Moreover, the chemical composition of the perlite ore, in particular the alkali content and its grain size, may influence its structure. The phenomena of expansion (perlite) and peeling (vermiculite) have a positive effect on the reduction of the final sand strength and eliminate technological inconveniences (poor knocking out) that significantly limit the wide use of moulding sands with inorganic binders.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Dehydroxylation of Perlite and Vermiculite: Impact on Improving the Knock-Out Properties of Moulding and Core Sand with an Inorganic Binder

et al. 2021

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“…Perlite is an amorphous volcanic glass that has relatively high water content, typically formed by hydration of obsidian. 15 Moreover, perlite is able to expand to 4–20 times its original volume (EP, Expanded Perlite) upon heating, resulting in flakes with porosity greater than 95%. 16 Perlite is mainly composed of SiO 2 , Al 2 O 3 , K 2 O, Na 2 O, and combined water, although it may also contain TiO 2 , CaO, MgO, and Fe 2 O 3 at minor quantities depending on its origin.…”

Section: Introductionmentioning

confidence: 99%

A study on using expanded perlite with hydroxyapatite: Reinforced bio-composites

Karip

Muratoğlu

2021

Proc Inst Mech Eng H

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People are exposed to different kinds of diseases or various accidents in life. Hydroxyapatite (HA) has been widely employed for bone treatment applications. In this study, HA was extracted from sheep bones. Bio-composites were doped with 1, 5, and 10 wt.% of expanded perlite and 5 wt.% of ZrO2–MgO-P2O5. The bio-composites were prepared by the cold isostatic pressing method (250 MPa) and sintered at 900°C for 1 h. In order to evaluate the characteristics of the bio-composites, microhardness, density, X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FT-IR), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) analyses were carried out on them. Additionally, the specimens whose characteristics were determined were kept in synthetic body fluid (SBF), and their in vitro behavior was examined. As a result, it was observed that microhardness increased as both the weight and the grain size of the expanded perlite were increased. Calcium silicate, tri-calcium phosphate, and hydroxyapatite were observed in the XRD analysis of all samples, and the formation of apatite structures was increased by addition of ZrO2–MgO–P2O5.

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“…Republic of Macedonia is rich in inorganic materials with a wide spectrum of potential use and application [1][2][3][4]. Clayey diatomite, found in the vicinity of the Bitola power plant, takes a special place amongst non-metallic materials because it represents a mixture of diatomite and clay minerals [5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermal Treatment of Clayey Diatomite at Temperature Range 800-1200°C

Reka¹,

Pavlovski²,

Ademi³

et al. 2020

Prime Archives in Chemistry

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Trepel is the local name for a mixture of diatomaceous earth and clay minerals. It represents a greyish, soft, very light, weakly cemented, fine biogenetic sedimentary rock. The studied material is taken from the vicinity of Bitola city (Republic of Macedonia). Here, clayey diatomite was treated up to three temperature intervals (800, 1000 and 1200 o C) for a period of 1 hour. The X-ray powder diffraction results indicate the presence of both an amorphous phase and the following crystalline phases: quartz, feldspars (plagioclase), mica (muscovite) and chlorites. The results of SEM analysis revealed skeletons of alga Diatomeae with nano-pores. By thermal treatment of the samples, a gradual change in color as well as higher bulk density and compressive strength was observed. The increase of the temperature, in addition, affected the mineralogical composition and increased the presence of the amorphous phase (aluminasilicate glassy phase). SEM results of the thermally investigated samples depicted morphological changes expressed by shrinkage of the pore diameters in comparison to the initial material. The major and minor constituents were established by chemical analysis revealing the following chemical composition of raw clayey diatomite: SiO 2 (63.65 wt%), Al 2 O 3 (11.76 wt%), Fe 2 O 3 (5.93 wt%), MnO (0.13 wt%), TiO 2 (0.63 wt%), CaO (1.42 wt%), MgO (2.22 wt%), P 2 O 5 (0.11 wt%), K 2 O (1.63 wt%), Na 2 O (0.92 wt%), LOI (11.50 wt%).

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Chemical, mineralogical and structural features of native and expanded perlite from Macedonia

Cited by 40 publications

References 13 publications

Dehydroxylation of Perlite and Vermiculite: Impact on Improving the Knock-Out Properties of Moulding and Core Sand with an Inorganic Binder

Dehydroxylation of Perlite and Vermiculite: Impact on Improving the Knock-Out Properties of Moulding and Core Sand with an Inorganic Binder

A study on using expanded perlite with hydroxyapatite: Reinforced bio-composites

Effect of Thermal Treatment of Clayey Diatomite at Temperature Range 800-1200°C

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