The combined effects of supersaturation and Ba2+ on the batch cooling crystallization of potassium dihydrogen phosphate by Guozong Zheng, Jingkui Liang, Zhengdong Li, Genbo Su, and Xinxin Zhuang

Crystal Research and Technology

Cryst. Res. Technol. 43, 583 (2008) - Abstract -

The combined effects of supersaturation and Ba²⁺ on the batch cooling crystallization of potassium dihydrogen phosphate

Guozong Zheng, Jingkui Liang, Zhengdong Li, Genbo Su, and Xinxin Zhuang

Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, P.O. Box 143, Fuzhou, Fujian 350002, P. R. China

Keywords	crystal morphology, supersaturation, Ba ions, batch crystallization, phosphates
PACS	81.10.-h, 81.10.Aj, 81.10.Dn, 61.10.Nz
DOI	10.1002/crat.200711065

The combined effects of supersaturation and Ba²⁺ on potassium dihydrogen phosphate (KDP) were investigated in batch cooling suspension crystallization. Growth size, morphology, and impurity Ba²⁺ adsorbed in the KDP crystals were measured with changing Ba²⁺ concentration and supersaturation. Significant changes in shapes and volume of the grown crystals have been observed. The results further confirmed that the size and shape of crystals were greatly determined by supersaturation. Ba²⁺ ions significantly modified the growth habit of KDP crystals. The concentration of Ba²⁺ ions adsorbed in the crystals increases with the increasing Ba²⁺ ions in the solutions and supersaturation. The foggy phenomena caused by the addition of Ba to the KDP solution were also described.

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