Abstract
We have studied various ways of preparing acicular magnesium pyroborate (Mg 2B 2O 5). We formed acicular Mg 2B 2O 5 from the reaction of an MgO-H 3BO 3-KCl mixture (2:3:5 mole ratio) at 850°C. The product, however, contained agglomerates derived from large MgO particles. In a variation, finely mixed raw material was prepared by the spray drying of slurry. The slurry was made by dissolving MgCl 2, H 3BO 3 and KCl in hot water and neutralizing it with KOH. The reaction was again driven at 850°C. The product was acicular Mg 2B 2O 5 without agglomerate, but the crystal length did not exceed 10μm. Finally, Mg 2B 2O 5 crystals 20-40 μm long and 1-3 μm thick were obtained by seeding the slurry with small Mg 2B 2O 5 crystals.
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