Abstract
Magnesium oxide (MgO) is a ceramic material that has potential in the medical and industrial fields, where MgO can be obtained from natural dolomite which has a composition of 21.9% MgO and 54.3% CaCO3. However, MgO from dolomite has not been studied much so that this study was conducted with the aim of analyzing the effect of the holding time of calcination on the synthesized MgO phase. The MgO synthesis method uses the Leaching method, which is dissolving dolomite with HCl and stirring it at 75 ° C for 45 minutes. After that, it is filtered where the results of the filtrate are added with ammonia until the solution reaches pH 12 and a precipitate is formed. Furthermore, the precipitate was filtered and dried at 90 ° C for 6 hours, and calcined at a temperature of 800 ° C with a variation of the holding time of 4, 8, 12, 16, and 20 hours. The calcined powder was characterized by XRD and FTIR. The results showed that the optimum MgO periclase main phase was formed at a holding time of 8 hours at a calcination temperature of 800 ° C and had a nanocrystalline size of 20.12 nm. FTIR results show that the MgO synthesized with a holding time of 8 hours has functional groups Mg-O, Mg-O-Mg, C = O, alkene groups, and H-O-H in the wave number range of 4000 cm-1 - 500 cm-1.
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