[논문]Production of high-purity MgSO4 from seawater desalination brine

Kim, Myoung-Jin; Kim, Sehun; Shin, Seonmi; Kim, Geunyoung

doi:10.1016/j.desal.2021.115288

Production of high-purity MgSO4 from seawater desalination brine

Desalination, v.518, 2021년, pp.115288 -

Kim, Myoung-Jin (Department of Environmental Engineering, Korea Maritime and Ocean University) , Kim, Sehun (Department of Convergence Study on the Ocean Science and Technology, Korea Maritime and Ocean University) , Shin, Seonmi (Department of Environmental Engineering, Korea Maritime and Ocean University) , Kim, Geunyoung (Department of Environmental Engineering, Korea Maritime and Ocean University)

Abstract ▼ AI-Helper

Abstract In this study, we developed a technology to recover Mg from seawater desalination brine in the form of high-purity MgSO4 that did not contain Ca impurities. The MgSO4 recovery consisted of pre-precipitation of Mg(OH)2 using alkali, concentration of Mg using sulfuric acid, and precipitation of MgSO4 using ethanol. The removal of Ca impurities by adding ethanol twice into the Mg concentrate in the precipitation process was subtle but a highly beneficial novelty. The first dosage of ethanol was added to the Mg concentrate by adjusting the quantity such that only Ca (without Mg) was precipitated in the form of CaSO4. Then, the ethanol was further added to the Ca-free Mg concentrate to precipitate high-purity MgSO4. This two-step ethanol addition ensures effective removal of Ca impurities without Mg loss using the difference in the solubility of CaSO4 and MgSO4 in ethanol. As the purity of the recovered MgSO4 was up to 99.8%, it could be used to re-mineralize fresh water after the seawater desalination process. According to the cost assessment, high-purity MgSO4 produced from seawater desalination brine is expected to be preferred over other products in pharmaceutical and food markets that require high purity and economic feasibility. Highlights We develop a technology to produce pure MgSO4 from seawater desalination brine. Ca impurities are effectively removed without Mg loss by adding ethanol twice. Purity of Ca-free MgSO4 produced is very high up to 99.8%. The technology uses the solubility difference between CaSO4 and MgSO4 in ethanol. Mg recovery efficiency is 67%, producing 15.8 kg of MgSO4·7H2O from 1 ton of brine.

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Production of high-purity MgSO4 from seawater desalination brine

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Production of high-purity MgSO4 from seawater desalination brine

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