- [Korean]
- Extraction of MgSO4 from dolomite and synthesis of Mg(OH)2 in Bittern
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HyunSeung Shim, Jiyeon Kim, Areum Choi, Nuri Oh, YooJin Kim
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Received March 31, 2025 Accepted April 18, 2025 Published online April 21, 2025
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DOI: https://doi.org/10.4150/jpm.2025.00073
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 Abstract
- We synthesized magnesium hydroxide using bittern and dolomite, which are domestic resources. In Bittern, there is a high concentration of Mg2+ ions, but the impurity Ca2+ ion content is also significant, requiring a purification process to remove it. There are two main methods for this purification. Firstly, there is a separation method that utilizes the difference in solubility between Mg2+ ions and Ca2+ ions by using sulfuric acid on dolomite. Adding MgSO4 solution from dolomite to Bittern removes Ca2+ ions as CaSO4. This process simultaneously purifies Ca impurities and increases the Mg/Ca ratio by adding extra Mg2+ ions. In this study, purified bittern was obtained by using dolomite and sulfuric acid to extract MgSO4, which was then used to purify Ca2+ ions. High-purity Mg(OH)2 was synthesized by optimizing the NaOH and NH4OH ratio as an alkaline precipitant.
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