The Kinetics of Magnesium Carbonate Crystallization for Traditional Salt Production Wastewater Recovery

Mirna Apriani; Wahyono Hadi; Ali Masduqi

doi:10.4028/www.scientific.net/MSF.964.136

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HomeMaterials Science ForumMaterials Science Forum Vol. 964The Kinetics of Magnesium Carbonate...

The Kinetics of Magnesium Carbonate Crystallization for Traditional Salt Production Wastewater Recovery

Abstract:

The kinetics of crystallization of magnesium carbonate (nesquehonite) at room temperature (27°C) has been examined using an electrical conductivity method during process of nucleation. Magnesium carbonate hydrate from a reaction of magnesium chloride (MgCl₂) and sodium carbonate (Na₂CO₃) in supersaturated condition was analyzed. Variations of batch reactor experimental are magnesium chloride initial concentration (500-3.000 mg/L) and operating pH (8-14). In this paper, we studied the crystallization kinetics of magnesium carbonate via an electrical conductivity method, a concentration monitoring method. By monitoring electrical conductivity during the solution reaction process, changes in [Mg²⁺] can be measured and an induction period of nucleation could be determined. Crystal has been formed was confirmed with powder X-ray Diffractometer (XRD) analyses. The results show that magnesium carbonate is formed during operating condition pH 10 with magnesium chloride initial concentration 3.000 mg/L. The nucleation process of magnesium carbonate crystallization can be represented by second-order reaction equation with R² is 0.8. The induction period of magnesium carbonate crystallization is 50 second.

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Materials Science Forum (Volume 964)

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136-144

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https://doi.org/10.4028/www.scientific.net/MSF.964.136

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Online since:

July 2019

Authors:

Mirna Apriani*, Wahyono Hadi, Ali Masduqi

Keywords:

Bittern, Kinetics, Magnesium Carbonate, Reaction Order, Supersaturated

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