Metastable zone width of SrCl_2·6H_2O during cooling crystallization

摘要

The metastable zone width (MSZW) of SrCl_2·6H_2O during cooling crystallization was determined by the focused beam reflectance measurement (FBRM). The effects of the saturation temperature, cooling rate, stirring rate, and Ca~(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~(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 μm, 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.