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Structural and microstructural characterization ofAlgerian diatomite

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Academic year: 2021

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Structural and microstructural characterization ofAlgerian diatomite

S.Benayache1,*, S.Alleg2, S. Souilah2, H.Meradi1, F.Aouadja1

1 Welding and NDT research center (CSC) BP 64 CHERAGA Algeria

2 Laboratory of Magnetism and Spectroscopy of Solids (LM2S), Faculty of Science, Physics department, BadjiMokhtar-Annaba University, BP 12, Annaba 23000 Algeria

* Corresponding author (sihem.benayache@yahoo.fr)

ABSTRACT

Diatomite is a sedimentary rock composed of fossilized skeletons of diatoms which are microscopic unicellular alga. Due to its useful physical and chemical characteristics, it is used in a wide range of industrial applications. Raw diatomite samples were taken from SIG region of Algeria. Chemical composition, morphology, structure and specific surface area are determined by X-ray fluorescence, scanning electron microscopy, X-ray diffraction, Fourier Transform Infrared Spectroscopy and N2-adsorption-desorption analysis, respectively. The XRF results indicate that the raw diatomite is mainly composed of silica (>60%) and CaO (>14%). The XRD pattern reveals a mixture of amorphous silica and crystalline phases such as quartz and tridimite. The surface area, pore volume and pore size are 26.4 m2/g, 0.204cm3/g and 30.82 nm, respectively.

Keywords: Diatomite; characterization; pore; FTIR

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