Abstract
Given the known carcinogenic effects, asbestos minerals are considered as general health hazard. Therefore, the elimination of asbestos materials from the environment is necessary. Asbestos minerals should be entirely transformed to a non-hazardous material. One of these methods is destructing the fibers structure of asbestos minerals by thermal treatment. Asbestos minerals are naturally occurring hydrous silicates, so that they decompose to release water by heating at high temperatures which may lead to changes in crystal structure and the formation of new phases without the dangerous properties. In this article, thermal behavior of asbestos minerals is investigated to observe the disappearance of this hazardous structure and to characterize products obtained by this way. Ten samples of asbestos minerals (six chrysotile samples from different locations, two samples of crocidolite, one amosite, and one tremolite) from different locations were tested. Mineralogical and morphological data (X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy) were obtained before and after differential thermal analysis.
Highlights
Asbestos is a general name applied to a group of silicate minerals which naturally occur in fibrous form
The aim of the research presented in this study is to determine and compare the structural and phase transformations which are subject to different types of asbestos minerals during dynamic heating to 1,000 °C by DTA method in order to verify the disappearance of crystalline asbestos fibers
Amphibole asbestos minerals after thermal treatment which was used in this study show high-grinding ability
Summary
Asbestos is a general name applied to a group of silicate minerals which naturally occur in fibrous form. One of these methods is destructing the fibers structure of asbestos minerals by thermal treatment. Thermal behavior of asbestos minerals is investigated to observe the disappearance of this hazardous structure and to characterize products obtained by this way. Keywords Asbestos minerals Á DTA Á FT-IR Á SEM Á Thermal decomposition Á XRD
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