Metastable zone width of SrCl sub(2).6H sub(2)O during cooling crystallization

• Published in: Crystal research and technology (1979) Vol. 49; no. 1; pp. 78 - 83
• Main Authors: Qian, Yuanyuan, Lu, Guimin, Sun, Yuzhu, Song, Xingfu, Yu, Jianguo
• Format: Journal Article
• Language: English
• Published: 01.01.2014
• Subjects: Beams (radiation); Cooling; Cooling rate; Crystallization; Crystals; Saturation; Seeds; Stirring
• ISSN: 0232-1300; 1521-4079
• DOI: 10.1002/crat.201300303

The metastable zone width (MSZW) of SrCl sub(2).6H sub(2)O during cooling crystallization was determined by the focused beam reflectance measurement (FBRM). The effects of the saturation temperature, cooling rate, stirring rate, and Ca super(2+) ion impurity on the MSZW were investigated. The MSZW increased with the increase in the cooling rate and decreased with the increase in the saturation temperature, stirring rate, and Ca super(2+) ion concentration. Moreover, the effect of seed crystals on the MSZW was investigated, where two types of seeds were used, namely, seed 1# and 2# with volume mean crystal sizes of 64 and 218 mu m, respectively. The seeded MSZW decreased than the unseeded one. The MSZW of seed 1# was greater than that of seed 2# when the same amount of seed was used. The MSZW of seed 1# increased with the increase in the seed loading, whereas that of seed 2# decreased. The metastable zone width (MSZW) of SrCl sub(2).6H sub(2)O during cooling crystallization was determined by the focused beam reflectance measurement (FBRM). The effects of the saturation temperature, cooling rate, stirring rate, Ca super(2+) ion impurity, and seed crystals on the MSZW were investigated. The MSZW increased with the increase in the cooling rate and decreased with the increase in the saturation temperature, stirring rate, and Ca super(2+) ion concentration. The seeded MSZW decreased than the unseeded one, and seed surface is the key factor for nucleation. Small seeds provide a large surface area with high adsorption capacity for solute. They can consume more supersaturation on seed growth, thus retraining nucleation.