PROCESS FOR THE GRANULATION OF PRECIPITATION PRODUCTS FORMED FROM AMMONIUM COMPOUNDS BY SUBSTITUTION WITH ALKALINE-EARTH COMPOUNDS

摘要

The disclosure describes a process for the granulation of the precipitation products formed from ammonium compounds by substitution with alkaline-earth compounds. The solution for treatment and an alkaline-earth compound, preferably milk of lime or lime water, which is present in aqueous solution, are introduced into the bottom section of a reaction chamber, and are mixed intimately therein. The solutions are mixed immediately on or after entry into the reaction chamber, and the alkalineearth compound precipitation products are withdrawn in the form of a hard granulate difficultly soluble in water from the reaction chamber. The disclosure also describes an apparatus for performing the process. It is characterized by a reaction chamber consisting of a cylindrical fluidizing chamber followed at the top by a conically widened portion and pipes for supplying a reaction liquid leading into the fluidizing chamber. The top section of the reaction chamber is provided with a spigot for withdrawal of the treated liquid and the middle and/or bottom of the reaction chamber is provided with a spigot for withdrawing the granulates.