The batch crystallization of potassium chloride from aqueous solution is investigated without impurities, with zinc chloride I (30, 100, 1000 ppm), with sodium hexanietaphosphate I1 (100 ppm) and potassium hexacyanoferrate (11) I11 (1 00, 500, 1000, 16 x 25 ppm). The dominant particle size of the pure system LN,D = 427 V r n increases by 4040 by addition of I and by 250% by addition of 11. While I does not affect the habit I1 changes it from cubes to octahedrons. In cases of low concentration, 111 leads to dendrites.It is shown that addition of 111 decelerates growth and increases the metastable zone width. Hence a high supersaturation is formed, the solution impoverishes fast while 111 gets incorporated and therefore a strong nucleation starts in a relatively pure solution. By quasi-continuously adding 16 x 25 ppm of 111 the dominant particle size increases by 160% with little fines. In this case the content of 111 in the product is relatively low.
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