Abstract
The controlled double jet precipitation of silver halides from a homogeneous reaction in the liquid phase involves a chemical reaction which produces supersaturation, nucleation, and growth of crystals. Mixing influences all three of these processes. The mixing/stirring conditions play an important role in controlling the chemical composition, average grain size, and grain size distribution of formed particles. The purpose of this study was to determine the dependence of the mixing and stirring conditions on the controlled double jet precipitation of silver halides. Experiments were conducted in a flat-bottom crystallizer, a profiled bottom crystallizer, and a profiled bottom crystallizer equipped with a conical draft-tube. The average crystal diameter of the formed silver chloride microcrystals was independent of the crystallizer configuration if the frequency of revolution of the 50 mm diameter impeller was greater than 300 RPM. The variation coefficient decreased if the controlled double jet precipitation was carried out in a crystallizer with a profiled bottom and/or a draft-tube.
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