Characterization of the Magnesium Borates Hydrothermally Synthesized from Na2B4O7.5H2O, MgCl2 and H3BO3 at the Boiling Point

There are more than 230 boron minerals which contain different amounts of boron oxide (B2O3) percentages. Magnesium borates are one of the boron mineral groups that have important properties of high elasticity coefficient, resistance to corrosion and high heat resistance. In this study, magnesium borate production is studied by hydrothermal synthesis method from a sodium borate mineral of tincalconite (Na2B4O7.5H2O) at 100 o C while stoichiometric mole ratio Mg/B is 1:8 determined from pre-experiments. The other raw materials are used as dehydrated magnesium chloride (MgCl2) and boric acid (H3BO3). Four different reaction times studied which are 30, 60, 120, 240 minutes. For the characterization analysis Philips PANanalytical X-Ray Diffraction (XRD) and Perkin Elmer Spectrum One Fourier Transform Infrared Spectroscopy (FT-IR) are used. From the results of the experiments magnesium borates are synthesized at the form of “Admontite” [MgO(B2O3)3.7(H2O)], “Aksaite” [Mg(B6O7(OH)6).2H2O] and “Magnesium Boron Hydrate” [MgB12O19.5(H2O)].