Application of seeded batch crystallization methods for reduction of the scaling tendency of seawater - A study of growth kinetics of calcium carbonate in seawater

作者：Omar W; Chen J; Ulrich J^*

来源：Crystal Research and Technology, 2009, 44(5): 469-476.

DOI：10.1002/crat.200800272

• scale control
• seawater
• growth kinetics
• desupersaturation
• calcite
• aragonite

The objective of this study is to evaluate the applicability of a seeded batch crystallization method as a pretreatment stage to the reduction of the the scaling potential of seawater. The crystallization process of calcium carbonate in supersaturated seawater is studied experimentally in a seeded batch crystallizer. Results show that the initial pH value of seawater must be adjusted to be in the range of 8-9. Calcite seeds will not have the potential to start the growth process in seawater at he the normal pH (7.36) compared to the above mentioned range. The growth kinetic parameters are determined from the measured desupersaturation curves. It is found that the growth process of calcite is controlled by surface integration step. The growth rate of calcite increases with increasing temperature and seeding ratio (up to 1 g/L), while it decreases with increasing the salinity of seawater. Crystals of calcite morphology are found to be growing faster than seeds of aragonite morphology. Stirrer speed has no distinct effect on the growth rate of calcite in seawater.

• 出版日期2009-5
• 单位天津大学