Journal of Powder Materials

Research Article

[Korean]
Synthesis and Morphology Control of Needle Type 513 MHSH and Mg(OH)₂ from Dolomite: Jiyeon Kim, HyunSeung Shim, Seong-Ju Hwang, YooJin Kim; J Powder Mater. 2025;32(5):399-405. Published online October 31, 2025; DOI: https://doi.org/10.4150/jpm.2025.00227

Abstract PDF: 513 magnesium hydroxide sulfate hydrate (MHSH) and Mg(OH)₂ were synthesized by controlling the pH and concentration using a domestic resource, dolomite (CaMg(CO3)2), as the raw material. The MgSO₄ was extracted by treating dolomite with sulfuric acid under various conditions. Hexagonal plate-shaped Mg(OH)₂ and needle-like 513 MHSH were synthesized under the hydrothermal condition. The morphology of the synthesized materials was controlled by adjusting the pH (SO42-/OH- ratio) and hydrothermal reaction time. As the pH of the solution increased, the formation of plate-like structures became dominant, whereas lower pH values (higher SO42- concentration) led to needle-like forms. The results of the 513 MHSH, which was synthesized using reagents and sea bittern, are consistent with the synthesis conditions, and we observed changes in the length and aspect ratio of the needle-shaped structure in response to adjusting the hydrothermal reaction time.

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