Investigation of the structural and mineralogical changes of Tunisian phosphorite during calcinations

被引：49

作者：

Elgharbi, S. ^{[1
]}

Horchani-Naifer, K. ^{[1
]}

Ferid, M. ^{[1
]}

机构：

[1] Natl Res Ctr Mat Sci, Lab Phys Chem Mineral Mat & Applicat, Soliman 8027, Tunisia

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2015年 / 119卷 / 01期

关键词：

Tunisian phosphorite; Calcinations; Fluorapatite; Calcite; THERMAL-TREATMENT; PHOSPHATE ORES; RAMAN; APATITES; SPECTROSCOPY; SEDIMENTARY; MIXTURES; ROCK;

D O I：

10.1007/s10973-014-4132-5

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The thermal behavior of Tunisian phosphorite was investigated with X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR), and Raman spectroscopies and DTA-TG measurements. The XRD patterns showed that the chief mineral constituents of calcined samples are calcium oxide and fluorapatite, while those in the raw phosphorite are calcite, dolomite, fluorapatite, and carbonate-fluorapatite. Physicochemical transformations result in the oxidation of organic matter, disappearance of calcite and dolomite crystalline phases, and partial dissociation of structural carbonates. The FT-IR and Raman spectra showed modifications of some bands; a decrease in the intensity of the v(2) and v(3) vibrations of carbonate groups and the appearance of new bands at 520 and 926 cm(-1) after calcination of phosphorites at 800 degrees C. These bands were assigned to isomorphous substitutions of PO43- in apatite by SiO44-. Heat treatment alters the qualitative composition of the mineral as a result; the solubility of apatite in dilute citric acid was decreased.

引用

页码：265 / 271

页数：7

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