Unie Van Kunstmestfabrieken B.v.

Gijsbertus H Calis

Matheus H Jennekens

Separating Ca(NO.sub.3).sub.2.4H.sub.2 O from a nitrophosphate digestion liquor by crystallization, wherein Ca(NO.sub.3).sub.2.4H.sub.2 O seeding material with a particle size smaller than 100 .mu.m is added to this liquor at a temperature of 0.degree.,1.degree.-2.degree. C. lower than the saturation temperature, the resulting liquor is batchwise cooled, and the Ca(NO.sub.3).sub.2.4H.sub.2 O crystallized out is separated from the cooled liquor. The Ca(NO.sub.3 ).sub.2.4H.sub.2 O is substantially crystallized out without excessive cooling as very coarse and uniform particles which can be easily separated out.

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Gijsbertus H Calis