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Precipitation of Mg(OH)2 by the Reaction of Mg(N03)2 with Ammonia in a Flow Reactor

M. Láska, V. Khandl, and P. Fellner

Department of Inorganic Technology, Faculty of Chemical Technology, Slovak Technical University, SK-812 37 Bratislava


Abstract: The influence of ammonia content and of the retention time on the crystal size distribution of magnesium hydroxide prepared by the precipitation from Mg(NO3)2 solutions in a flow reactor was investigated. The temperature of the reacting mixture was 80°C. It was found that the higher is the content of ammonia and/or its surplus with respect to the stoichiometric demand, the larger are the Mg(OH)2 crystals. The longer is the retention time, the lower is the fraction of the particles smaller than 24 μm in the product. When the retention time of Mg(OH)2 in the reactor is shorter than 3 min, irregular agglomerates of Mg(OH)2 with sharp edges are formed while at the retention time longer than 5 min the aggregates have a round shape.

Full paper in Portable Document Format: 485a313.pdf


Chemical Papers 48 (5) 313–316 (1994)

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