Crystallization of calcium carbonate with the filtration of aqueous solutions through a microporous membrane |
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Authors: | E. A. Ananeva E. A. Mesyats V. V. Sergievskii |
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Affiliation: | 1.Moscow Engineering Physics Institute (MEPhI),National Research Nuclear University,Moscow,Russia |
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Abstract: | It is established that the filtration of water through a microporous membrane does not change the hardness of the water; it does, however, reduce the amount of scale deposit, due to the crystallization of salts in water in the form of aragonite. The effect is consistently observed in water with a hardness of more than 7.0 H, a content of hydrocarbonate ions of more than 500 mg/L, and a pH ≥ 7.3. It is shown that introducing the seeds of calcite crystals into a filtrate results in the precipitation of calcite rather than aragonite. It is concluded that quasi-softening in the case of hard water microfiltration is caused by the removal of calcite micronuclei, and thus by conditions being created for the crystallization of aragonite as a thermodynamically less stable form. |
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