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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Ultrasonic Crystallization of Calcium Carbonate in Presence of Seawater Ions
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Ultrasonic Crystallization of Calcium Carbonate in Presence of Seawater Ions

机译：海水离子作用下碳酸钙的超声结晶

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摘要

Ultrasonic technique was applied to remove the scaling compound CaCO3 as a pretreatment method in desalination process. Supersaturated solution of calcium carbonate was treated with an ultrasonic probe to precipitate CaCO3, followed by filtration to remove the precipitates. The fundamentals of nucleation, growth, crystal form and morphology of CaCO3 in the presence of the major seawater ions and ultrasound were investigated. Naked eye observation on induction time showed that ultrasound accelerates the nucleation by 60-85% though the major seawater ions delay the occurrence of nucleation up to 3 times longer. Continued ultrasound treatment after nucleation accelerates the growth rate by 2-5% only. Metastable vaterite with morphology of spherical aggregates constitutes similar to 90% of the obtained precipitates in most solution systems except F- and Na+, which favors calcite formation. Ultrasound treatment makes the aggregated crystals more fragile and breakable. As a pretreatment method, ultrasound technique not only accelerates the precipitation rate of CaCO3, but also has an effect in inhibiting the crystals growing into compact aggregates. (C) 2015 Elsevier B.V. All rights reserved.
机译：作为一种脱盐工艺的预处理方法，采用超声波技术去除了结垢化合物CaCO3。用超声探针处理碳酸钙的过饱和溶液以沉淀CaCO 3，然后过滤除去沉淀。研究了在存在主要海水离子和超声的情况下CaCO3的成核，生长，晶体形式和形态的基本原理。肉眼对诱导时间的观察表明，尽管主要的海水离子将成核的时间延长了3倍，但超声波可以使成核速度加快60-85％。成核后继续进行超声处理只能使生长速度提高2％至5％。在大多数溶液体系中，具有球形聚集体形态的亚稳态球ate石占所获得沉淀物的90％左右，除了F-和Na +有利于方解石形成。超声波处理使聚集的晶体更易碎和易碎。作为一种预处理方法，超声技术不仅可以加快CaCO3的沉淀速度，而且还具有抑制晶体长成紧密聚集体的作用。 （C）2015 Elsevier B.V.保留所有权利。

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