Observed Crystallization Induction Time in Seeded Gypsum Crystallization

被引：26
|
作者：
Choi, Jin Yong [1 ]
Lee, Tae [1 ]
Cheng, Yifan [1 ]
Cohen, Yoram [1 ]
机构：
[1] Univ Calif Los Angeles, Water Technol Res Ctr, Henry Samueli Sch Engn & Appl Sci, Chem & Biomol Engn Dept, 5531 Boelter Hall, Los Angeles, CA 90095 USA
来源：
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2019年 / 58卷 / 51期
关键词：
CALCIUM-SULFATE DIHYDRATE; REVERSE-OSMOSIS CONCENTRATE; ACCELERATED DESUPERSATURATION; TREATMENT TECHNOLOGIES; PRECIPITATION; NUCLEATION; KINETICS; WATER; DESALINATION; RECOVERY;
D O I：
10.1021/acs.iecr.9b06050
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The observed induction time for seeded gypsum crystallization was investigated with respect to gypsum particle seed size and mass loading. The induction time was significantly shortened in the presence of gypsum seeds (27-85 mu m) relative to unseeded solutions. The induction time correlated with the initial total seed surface area, suggesting that heterogeneous nucleation promoted by the added seeds is likely the governing mechanism responsible for shortening the observed crystallization induction time. The induction time also increased with increased magnesium ion concentration, but the effect diminished with increased initial gypsum seed area loading. The present study suggests that acceleration of desupersaturation of gypsum supersaturated solutions can be optimized with respect to the seed-added surface area with considerations of the inhibitory effect of magnesium on crystal nucleation and growth.
引用
收藏
页码：23359 / 23365
页数：7
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