Effect of Thermal Treatment on Natural Dolomite
Siti Fatimah Azzahran Abdullah, Siti Shuhadah Md Saleh, Nur Farahiyah Mohammad, Mohd Sobri Idris, H. R. Saliu
Abstract
Abstract Dolomite is a mineral material that is formed from limestone which is mostly contains the calcite (CaCO 3 ) and magnesite (MgCO 3 ). This paper aimed to study on thermal decomposition of dolomite under air atmosphere. Calcination of dolomite was carried out by using furnace with heating rate of 10 °C/minute in an air atmosphere. The different temperature of calcination was varied at 400 °C, 600 °C, 800 °C, and 1000 °C within 6 hours. Phase analysis (XRD) and functional group analysis (FTIR) were carried out to analysis the dolomite after calcination. Microstructural (SEM) and Energy Dispersive X-ray (EDX) analysis showed that the main constituents of pure dolomite include CaCO 3 (calcite), MgCO 3 (magnesite), CaO, and MgO. From the results, XRD showed that the high intensity of CaO and MgO at 800 - 1000 °C was much stronger than that of dolomite at 400 - 600 °C. In addition, FTIR presents strong and intense bands are observed at 3632.23 and 3690.98 cm −1 (800 °C), and also 3694.03 and 3633.60 cm −1 (1000 °C) due to the calcium oxide.