INVESTIGATION OF DECARBONIZATION OF GRANULATED LIMESTONE FROM THE EASTERN RHODOPES DEPOSIT, BULGARIA
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2021-01-01
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Limestones are widely used in various industries such as cement industry, glass industry, ceramic industry, chemical industry, metallurgy and others. The use of limestone is based on the mineral and chemical composition, structure, texture, physic-mechanical or technological properties. The chemical reactivity of different limestones shows great variation due to their differences in crystal structure and also due to the nature of impurities such as silicon, iron, magnesium, manganese, sodium and potassium. Changes in the structure of the pores play a significant role in the calcination mechanism and the reactivity of calcined lime. The thermal decomposition of limestone has been the subject of intensive research over the years. Limestones are extremely widespread in Bulgaria. They are represented in the form of layers, bundles and sedimentary formations. Thermal treatment of granulated limestone with grain size from 1 to 4 mm from deposit Eastern Rhodopes, Bulgaria at different temperatures in the range 700OC - K)()()``(' was performed, in order to establish the temperature regime of limestone decarbonization. Using the methods of X-ray diffraction and IR spectroscopy, it was proved that the limestone, which contains over 98 % calcite, begins to decarbonize above 800°C and is completely decarbonizes at 1000°C. After its decarbonization, CaO (quicklime) was formed, which was indirectly proven by the presence ofportlandite in the diffratograms and IR spectra.