Preparation of submicron-sized Mg(OH)2 particles through precipitation

Fiber and lamellar-like nanosized Mg(OH)2 particles were synthesized by precipitation of different magnesium salts with sodium hydroxide. An experimental design procedure was used to investigate the effects of salt concentration, base concentration, feed rate, and mixing rate on the mean particle size and the standard deviation of particle size distribution. The products prepared from MgSO4 were found to be different from those from MgCl2 and Mg(NO3)2. We concluded that the salt and the base concentrations were the key factors influencing the morphology of the final product, its particle size, however, was controlled mainly by the feed rate and the mixing rate.