In this study, anhydrous sodium metaborate (NaBO2), an industrial and technologically important boron compound, synthesis from concentrated tincal (CT) was carried out. Experiments with different temperature and time were performed in the parametric investigation to map out the reaction mechanism. Crystalline phase characterization of metaborates products indicates that anhydrous NaBO2 synthesis from a occurred at 400 degrees C with 5 h of reaction conditions. At the end of synthesis, the obtained anhydrous NaBO2 product can be used in many fields without having the calcination step due to the advantages of this method. (c) 2010 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.