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- 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
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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.
- [Korean]
- The Preparation and Growth Mechanism of the Recovered Bi2Te3 Particles with Respect to Surfactants
- Hyeongsub So, Eunpil Song, Yong-Ho Choa, Kun-Jae Lee
- J Korean Powder Metall Inst. 2017;24(2):141-146. Published online April 1, 2017
- DOI: https://doi.org/10.4150/KPMI.2017.24.2.141
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Abstract
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Bi2Te3 powders are recovered by wet chemical reduction for waste n-type thermoelectric chips, and the recovered particles with different morphologies are prepared using various surfactants such as cetyltrimethylammonium bromide (CTAB), sodium dodecylbenzenesulfonate (SDBS), and ethylenediaminetetraacetic acid (EDTA). When citric acid is added as the surfactant, the shape of the aggregated particles shows no distinctive features. On the other hand, rod-shaped particles are formed in the sample with CTAB, and sheet-like particles are synthesized with the addition of SDBS. Further, particles with a tripod shape are observed when EDTA is added as the surfactant. The growth mechanism of the particle shapes depending on the surfactant is investigated, with a focus on the nucleation and growth phenomena. These results help to elucidate the intrinsic formation mechanism of the rod, plate, and tripod structures of the Bi2Te3 recovered by the wet reduction process.
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Citations
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- Recovery of Barium, Nickel, and Titanium Powders from Waste MLCC
Haein Shin, Kun-Jae Lee
Journal of Powder Materials.2024; 31(5): 374. CrossRef
- Recovery of Barium, Nickel, and Titanium Powders from Waste MLCC
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